I've thought of putting together a BIG 7 for some time. This cartridge seems as though it would work well. It would fall between the STW and RUM in case capacity, although it would seem to be better balanced with a shorter, more efficiently burning powder column. Any thoughts?

True there is interest in a 7mm-375 Ruger. Are you planning a wildcat or waiting for a factory round?

For myself I have no interest in another wildcat. Been there done that.

The 7mm WSM is hardly mainstream but its here for now. One on a long action would work until something happens factory wise if ever. Then if a 7mm-375 Ruger gets introduced your barrel could be rechambered.

If someone does bring out a 7mm on a long action using the .375 Ruger's head and body profile I hope they make the neck a little longer.

To add that if a big case is down the road twist it fast enough for the 180 VLD.

High Country Long Range Hunter

The above rifle misses the mark for me what with its muzzle brake.

Already have a custom 270WSM. Probably won't ever do another WSM anything....

The WSM case is not exactly in the same league as the ones I'm talking......

The 7 WSM has a short neck also........

I've no doubt new cartridges will become commercialized based on the 375 Ruger case. The 30 T/C case also.........

It would fall between the STW and RUM in case capacity

I think you will find it will be smaller than the STW. Probably closer to a 7mm/300 Winchester.

Nope.......

I think you'll find it will land right where I said, mate....grin

I say it would be a hellofaround, if that is a word. I have a large 7mm Cat and I love its performance.

I'm thinkin' it has big potential and could turn out to be better than the STW or RUM based on the case design......

Can't see it.Look at the 300 WSM.It's loaded to the nuts and a good handload 300 win mag exceeds it.Think the same for the STW vs the 7 Ruger.

Can't see doing silly things with the 375 Ruger case.

If they do anything with it maybe some calibers that ain't covered up with others, 416 and 35 come to mind.

What THEY do, don't mean dick. It's what WE do.......

7STW---bad comparison, though. The 300 Win has a greater case capacity than the 300WSM. With the 300WSM having the shorter, more efficient case. The Ruger case exhibits both advantages over the STW case......

I sure as hell ain't gonna play with the damn thing...

A 416 seems inevitable in factory form........

I'd have to weight water in one.That ruger case looks like a beltless 300 win to these eyes.Grain for grain whats the diff between the 2 is what I'd love to know anyone?Yet to see a ruger case myself to compare.

I'm thinking it would beat the STW in several ways, and perform more like RUM in a shorter package using less powder.........

101gr for the Ruger case. I keep finding conflicting info on the capacity of the STW case, with 98.3gr being the highest figure so far..........

The Ruger case is fatter than the 300 win case......

You could be rite.But untill the crony who knows?

The Ruger might suffer from pressure swings.....laffin

It should burn more powder, more efficiently than the STW....thus adding to the case capacity advantage.....

And your point is?

Are you trying to garner support for a project? Or are you trying to get someone else to do it and then you can say it was your idea?

You've stated a hypothesis. Now prove it! The only way to prove it is to build one. Are you going to do it, or do you just want to talk about it?

Yes the Ruger case is fatter than the .300 Winnie. But it's shorter. (And yes, I've measured it. I have a whole box of Ruger ammo in my hand.) And yes it has less body taper. (I've measured that, too)

As we all know: Case capacity equals velocity. Therefore, logic tells us that it will be more than the 7mm Maggie, and less than the 7mm STW. And probably very close to the 7mm Dakota. At equal pressures!

I say: "Go for it!" Some folks just have to pee on the electric fence for themselves. What are you going to call it? the 7mm2MG?

7mm barrels are cheap. 'Course custom reamers are upwards to $200 and custom dies are around $150. And then there's custom headspace gauges, and expensive brass.... But the upside is you can name it. (If someone hasn't already..... and they probably have... )

So you don't like the WSM but stretch it out a tad and it becomes a good idea?

Grasshopper---I thought it would have more case capacity than the 7STW.........no?

SC---never said I didn't like the WSM, just said I'm done tinkerin' with it. We are talking much bigger case capacity here...

This would be a a cool wildcat,but I'd rather wait to see what other versions of this case Ruger will make before I spend the money for a wildcat.

Till then I'd rather spend the money and time hunting than on custom reamers,dies,etc.But I'll most likely get on board when ruger starts neckimg the case down to smaller calibers.

I can say that I think the Dakota factory rounds are pretty cool,I have a 330 Dakota and it's a fine round. The Ruger series would be a far less costly way for people to have an unbelted magnum case that fits in a 30-06 size action and gives performance in excess of what we generally see with 30-06 length belted magnums.

Britt

John Barsness in his article on the 375 Ruger (see extractbelow, taken from Big Bores forum) says the case capacity is 6% larger than the 375 H&H. That would make the 375 Ruger case a tad larger than mid way between the 375 H&H (and 300 Winchester) and the 375 Wby, 8mm Rem, etc.

The 2.5� Dakota calibres have about the same case capacity as the 300 Wby but the head diameter is based on 404 Jeffery, about .545. The Ruger is about .532, that is, the same diameter as the belt on belted magnums such as 7mm Rem, 300 Win etc.

Personally, I think the 7mm/375 Ruger would be much better if and when Ruger bring out a 300 Ruger as necking from 375 to 7mm is a long way.

by John Barsness
Rifle Magazine, May-June 2007 #231

Case capacity of an unfired case with a 300-grain Hornady round nose seated to the cannelure was 87.6 grains of water, while a new Winchester .375 H&H case with the same bullet seated held 82.7 grains, exactly the 6 percent increase in case capacity that Hornady claims.

I'm in a state of confusion, now. Every time I read or hear anything, a different case capacity is quoted.........

You need to be more like me, who gives a [bleep].............

Case capacity is a very inexact science. It will vary depending on who made the brass and what batch it came from within a manufacturer.

Even identical brass will have different volumetric capacities once it is fired, dependant upon chamber dimensions.


I do not believe a 30-375 Ruger will do a darned thing that can't be done with a 300 Wea, nor much that can't be done with a 300 Win mag.

That does not stop me from wanting one for the same reason I wanted a 264, and a 22-243AI, and a 7STW, and a 260 Rem. The latter two before anybody but nuts like the ones (me included)who frequent these forums had ever heard of them. I just think the 375 Ruger case design is great design and it should have been the design of choice when the 7 Rem mag and 300 Win mag were designed.

Not that I have anything against belts on my magnum, or fins on my Cadillac, for that matter. They are equally useful.

2MG,

Man, if you have an itch for a 7mm-375 Ruger, by all means have one built. That is what this rifle looney business is all about. You will have a great conversation piece where ever you carry it. Working up loads will be fun since it is not in any of the books. But it is close enough to the 7STW that you have good starting points with a bunch of different components.

And most of us will be very anxious to hear how your loads work out and what kind of real world performance you can achieve.

I thought about the same thing when I first heard about the 375 ruger. To be honest, I don't really see the point of the 375 ruger. The concept of designing a case solely for the purpose of equaling the 375 H&H while using a standard length action in order to make it cheaper is a bit lost on me. Folks that need something the size of the 375 H&H generally have a lot of money invested in a hunt anyways, so saving a few hundred bucks by buying the cheaper ruger isn't really going to factor into their decision making. I just don't see the market for the 375 ruger. However, I do see the potential of the case for wildcatters. My first thought went to a 7mm version on this case. I'm not sure it'll have quite the capacity of the 7mm stw, but it'll be close. It gets rid of the belt that so many people hate (I don't), and it'll fit in a standard size action. I've had both the 7mm stw and 7mm rem mag and the stw is good for about 250 fps over the rem mag. 140 gr bullets were no problem out of the stw at 3450-3500 fps. I'd imagine the 7mm-375 ruger should easily give you 3400 fps with 140 gr bullets, plenty for me. A huge advantage that I can see is that the reamer for a 7mm-375 should easily clean up a standard 7mm rem mag chamber and it shouldn't require any feeding modifications, so all it would really take to convert a 7mm rem mag to the new wildcat would be running a reamer into the chamber.

They all ready have a 30-375 Ruger. It was done about 100 years ago and called a 30 Newton

True.I can't imagine the 7mm/375 Ruger would be anything other than a good 7mm magnum;like a Dakota,or so similar you'd never notice the difference.Both have a jump on the 7RM and the 7WSM in case capacity and velocity...possibly not as fast as an STW,but with a 160 at 3200,a 140 at 3375,and a 120 at 3550(24" tube)...you will never notice.

Reminds me of a 7mm Dakota.

Without their brass price.

I think it makes alot of sense for a 2 1/2" case in a properly throated reamer and running the big slugs.

Related costs, not with standing.....

resurrection?

.......................The reason you don`t see the need for the 375 Ruger is that you haven`t thought outside the marketing box. Instead of just the cartridge itself, look at the 375 Ruger rifles too. Why are you at a loss in figuring out, that bringing a lesser expensive cartridge/rifle combo to the marketplace, might just allow those who want a 375, to better afford one? Whether one can afford $2k, $5K or only less than $1K, the 375 Ruger nevertheless, offers a lesser expensive alternative, which the cost differences in some cases, can be applied towards the expense of a hunt including a scope. You may not see the marketing need for the 375 Ruger, but to this date, Hornady, Ruger and the shooting public would disagree with your "no marketing need" assessment.

Here are a few points and reasons why the 375 Ruger has been so successful to the present, is currently successful, and will continue to be.

Rifle price!....Free marketing principles dictate most of the time, that when you have a good product that is always in demand, such as the 375 caliber always is, and then sell the product to the public at a very reasonable price, you`re going to sell a bunch of units. By the amount of 375 Ruger rifle sales to date, that has been proven and cannot be disputed.

Alternative case design!....Although there is no difference in game killing capability between the H&H and the 375 Ruger, the Ruger round nevertheless, has the greater powder capacity. This in turn allowed Ruger to develop rifles, chambering the Ruger round into rifles that are shorter, handier, easier to manuver, while duplicating from a 20" barrel, 24" to 25" 375 H&H ballistics. There`s no marketing value or need to do that??? Well! So far by the shooting public`s response, it would overwhelmingly seem that the shooting public has yet to reject the Hornady and Ruger vision!! If one can do the same things on the same game, and do so with the same ballistic performance from a shorter, in some cases a lighter rifle, as opposed to one that`s 44.5" to 46.5" long and heavier in some cases, then why not?

Hornady and Ruger saw the need and the factual results speak for themselves!

And because of the 375 Ruger`s success, we just may see a 7mm, 300, 338, 350/375 Ruger from Hornady and Ruger in the future as additional choices.

Gosh I hope you are right!

i am ready to build one on a 700 remington to see how it will feed without a belt, hucking a 180 Berger, and not using an extended Wyatts magazine box which I have done with the 7stw and the 180 berger,,, I didnt want to neck down 375 to 7mm, and deal with inside neck reaming or outside turning,,hoping for a smaller ruger caliber like a 7mm or 30,,, seems the necks would get thick, I neck 376 Steyr down to 8mm, a bullet just touches the inside of the neck on a fired case....

Hello

Im new to this forum but i love my 375/7mm ruger ! with a 140 nosler i get 3700 fps !!! Ruger markII action 28" shilen barrel. I biuld a new gun every year and i want to biuld a 7mm STW but couldn't find a ruger action so i started playing around with cases and ended up with a 375 ruger case !

Thanks Canyon Cruiser

A good startin point is the max dakota data !

canyon cruiser, what is the capacity of the 7mm/375 Ruger compared to the Dakota case.....Also curious how you have come by your data...sounds like a hell of a cartridge!

3700 fps from the 7/375 Ruger even from a 28" barrel seems hot.

I had a 26" 7 RUM a while back and the absolute max load with a moly coated 140 nos bt was 3665 fps.

The case capacity of the 7/375 Ruger is less than the 7 RUM, very close to the STW.

I happen to have some virgin 375 Ruger brass, some fired/fl sized 7 RUM brass and fired unsized 7 STW brass on hand. I filled each case with water:

375 Ruger 100.9 grains
7 STW 100.6 grains
7 RUM 114.8 grains.

A 7/375 Ruger should hold less than a full size 375 Ruger but I don't have the means to neck one down.


The 375 Ruger has 12.1% less case capacity than the 7 RUM. Using JB's 1/4th formula the non necked down 375 Ruger case would yield 4% less velocity compared to the 7 RUM. .96% of 3665 fps is 3518 fps. Add 50 fps or so for the longer barrel and that makes 3568 fps.

I won't deny you got 3700 fps but it seems to me you are working with some very high pressures.

If anyone can produce the actual water capacity of the 7/375 Ruger case I'd like to hear about it.

for conversation

the 7STW via QL...

83.5 gr RE 25 with a 140 loaded to 3.65" COAL gives 3422 FPS from a 28" bbl @ 66758 PSI (slightly OVER max pressure)

I would love to see the ruger case done up in 6.5 .277 and 7mm offerings. you get rid of the stupid belt which is really nice. the other nice thing is with the 375 ruger you get dangerous game capability in a standard rifle, the rifle is light and not a pig like the CZ 550 or RSM, its also likely closer to what most of us are shooting for regular big game. I find there is a lot of good that comes with shooting the same type rifles. if you are comfortable with a particular rifle I find all of your shooting is better. an added plus is the 375 ruger isn't a 1500-2k rifle like say an RSM. if I can save a grand on the gun, that is essentially the same size and dimension as my standard rifle, that leave me more comfortable and 1k more to spend on a hunt. so yeah that matters to me.

To me the biggest advantage would be that all you have to do is run a reamer into a 7 mag chamber and clean it up and you have an instant 7mm/375 Ruger! Do the same thing with an existing 264 win mag and you have a 6.5/375 Ruger. Now the 300 win mag presents a different problem in that the 300 win mag case is a little longer and might need to be set back






What would float my boat is a beltless 300/375 Ruger with the approx case capacity of the 300 Wtby in a 24" unbraked carry gun.

Don't know about dies though

It's always amazing to me how so many handloaders believe that some new case or some new powder will result in muzzle velocities far beyond anything anyone else has ever experienced.

At least with more-or-less normal pressures.

No undue expectations here, just an honest 3000 fps out of a 200 gr Accubond with no unnecessary belt or excess head clearance.

I believe JB was referring to the 3700 fps remark from another poster.

As for powders making a difference the newish RL-17 is different. I know Bob Jensen and from what I have read German Salazar is the real deal. When they say that RL-17 is unique in delivering higher velocities in certain cartridges I believe them.

http://www.6mmbr.com/reloder17.html

I have used RL-17 and it really shines in the 6mm Rem and 284. It delivered velocities I have not been able to obtain with any other powder.

Sorry guys iv been out of town working and havent had much time to play with my 7mm375 fixed ridge canyon crusier but i will answer any question i can to the best i can . I have been useing remington ultra mage cases to make my 7-375 because they ur easier to nech down to 7mm . I like play with gun so i dont mind taking the ten hours to make 75 cases . I started out using 80grs of imr4831 to fire forum and that i get 3700 fps with 140gr nosler . with my case formed and ready to go it will hold 92 grs of powder max. I have a old gentle man that has been playing with wildcats for last 40 years so i started looking at some of his different data and that is were im going to start this winter . my next load is going to be a 168 berger and IMR7828 . I will post more soon and sorry for the delay !

I believe u could use a ultramag reamer and run it in at the correct length . The ultramag uses the same outside demension and shoulder angle .

I'm interested to see some pics of this rifle and some targets/chronograph readings. I too thought of necking down the 375 Ruger to 7mm when the round was first introduced. Have a "small" 7, a "med" 7, so all thats left is a "biggish" 7. Yeah I know the 7/375 doesnt outrun my 280AI with 140s by enuf to be noticeable to animals, but you wildcat stuff because you want it. Never saw anything written as law that said it had to make sense. That round set up for the 168VLD should be a long distance killin machine. Now if I could just find somewhere to ring it out so it sounds practical to my wife.

I'm getting confused here...is Canyon Cruiser running an UltraMag,or a 375 Ruger case necked to 7mm?

What barrel length?

If it's the 375Ruger necked down to 7mm, it's about identical to a 7mmDakota,and I am having a hard time getting my head around 3700 fps with a 140......just curious.

I know of 1 7mm wildcat that runs "around" (and i use that term kind of loosely) 3700 with 140s. It is a larger cal RUM necked down to 7mm with a longish barrel. IF 3350 with 168VLD could be accomplished from the 7-375 wildcat, Id definitely be all over it. But, I'm of the "see how someone elses rifle does" group.

Read this and be impressed!


http://www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/1663822/Who_had_the_7mm_338_Ultra_Mag


Mike

Ready: I do remember that thread;but that is not the 375 Ruger case.

Would you share with us, your technique for reducing a case which measures .550" at the base to the .532" required to fit in a Ruger magnum chamber?

Or are you perhaps shooting a 7mm wildcat based on a shortened 300 Ultramag case?

I'm a little confused also as to what he means.

Wow, this post is over 3 years old, and someone actually did the 7/375 thing and my azz just went and built another 7mm Rem Mag .....