Home Forums Hunting & Shooting Custom Rifles & Wildcats 30-8mmRM / 30 STW

Hello all -

I was wondering if anyone had any experience with this round, and if so, what your opinion is re: accuracy and ease of case forming and reloading. If I go this route it will be my first experience with case forming.

Also, what is the preferred name?

Thanks,

tq

Simply size 8mm Mag. cases as you would any standard cartridge and go. Accuracy can be as good as you want it to be. Good luck, Troy

I'd build it with a 27-28" bbl length, #4 contour or #5 fluted on a Rem 700 riding in a McMillan BDL or HTG stock with Weatherby fill. Be a good long range hammer with a good Leupie sitting on her.

MtnHtr

Isn't this also called a .300 Jarrett ?

The jarret cartridge is also improved.It is not simply a necked down 8mmremmag.

How does this round compare to the .300 WBY?

It's been called numerous things,but 30-8mmRemmag,300 Super and 30STW are the most common. My dies are marked 30-8mmRemMag and I've built two rifles so chambered.

Brass is a one pass operation and I very much like the chambering. Accuracy can be on the far side of superb and as far as Wildcat chamberings go,it is of the friendliest variety in regards to forming hulls.

She is my favorite Big 30 for the reasons cited,as well as it's very convincing performance on critters..............

It is a 300Wby +P+ and utilizes a shorter throat. I'm not cussing freebore,because I dig it in the 257Wby,but some are not comforted in that area.

She hauls ass...............

Plus you should be able to hold more rounds than a .300 Ultra-Mag if that concerns you...Isn't it a 3 down 1 up chambering for remmies?

Mike

Both the 8mm rem mag based cartridges and ultramag cartridges hold three rounds in the magaziner in 700 rifles.

Thanks stubblejumper...I thought the UM's only held two.

Mike

I have two Jarrett's chambered in the 300Jarrett. Velocity beats the Weatherby by 100fps or so, neglibile amount. Accuracy is exceptional asssuming I do my part behind the gun. Both rifles hold 3 in the mag and 1 in the tube.

Good Luck

True Eyes

I had one built. I was getting 3300 fps or a bit more from a 180 grain bullet and 3125 fps from a 200 grain bullet in a 26" barrel. I went back to the 300 Win Mag for a few reasons. I demand excellent accuracy. That requires good brass among other things. I would rather spend more money for Federal or Norma or Lapua brass than have to spend a great deal of time making lesser quality brass useable (not to mention the need to simply toss out a significant portion of that lesser quality brass-or use it for fouling shots). Remington is the only source as far as I know for 8mm Rem Mag brass. Quality is variable and certainly not as good in general as the Lapua, Norma or Federal (which I have heard Federal is no longer making for bulk brass sales in 300 Win Mag). Anyway I do have a bunch of Federal brass in 300 Win Mag and when that runs out I intend to use Lapua.



Even if Lapua made 30 STW brass I am not sure I would chamber my rifle for that cartridge now. The action I am using is a Win 70 so magazine box is 3.6" long which requires deep seating of bullets into cases that are 2.85" long.



The major reason I would not likely use that cartridge again is that it really offers no useable advantage that I can see. On top of that it uses more powder, recoils more and wears the barrel out more quickly. Let's look at the supposed advantage of using the bigger case. In my 300 Win Mag (25.15" barrel) I am getting 3030 fps with the 200 grain Nosler Accubond. Let us assume 3130 from the 30 STW. At what range will the 30 STW kill better? What kills an animal? Is it energy or bullet placement or expansion or what? From what I have learned over the years energy and velocity are not that big of a deal. We need a high enough velocity to ensure that the bullet will expand though. What velocity is required for adequate expansion? It depends on the bullet. Most bullets (from conversations I have had with bullet makers) expand at 2000 fps and above. Some need higher velocity and some will expand even at lower velocity. But let's take 2000 fps as our limit. So the question now becomes at what range will the bullet still be traveling at 2000 fps if started at 300 Win Mag velocity versus 30 STW velocity? If the 300 WM starts the Nosler 200 Accubond (bc=0.588) bullet at 3030 fps and the elevation is 1000' then the velocity at 725 yards would be 1997 fps. The same bullet started at 3130 from the 30 STW would be traveling 2012 fps at 775 yards. So you have gained 50 yards with the extra 100 fps muzzle velocity. Can you make killing shots at that range every time? If not why bother with the bigger case? Is the extra 100 fps of muzzle velocity going to kill the animal any deader or more effectively at less than 700 yards? I seriously doubt it. Is it going to help you hit the vitals any easier? With a 250 yard zero the slower bullet will drop 6.6” more at 725 yards (91.6" versus 85"). Clearly you are not going to aim high. Instead you will dial in clicks on your scope. So instead of 47 clicks elevation for the 30 STW at 725 yards you will have to dial in 51 clicks. So what!? The difference in windage is 1.5" at 725 yards from a 10 mph cross wind. Are you really going to take the shot at that range in a 10 mph cross wind?



Any way I suspect that you get my point. Not many people can utilize the very small advantage that the 30 STW case offers over the 300 Win Mag. We could argue that not many people can utilize the advantage that the 300 WM offers over the 30-'06 or the 30-'06 over the .308 Win etcetera. So if you want a 30 STW go for it but I hope you will do it with eyes open as to the limitations of its advantages and the likelihood that it will not be as accurate as a 300 Win Mag. Good luck, Rufous.

What are you typing that makes so many wierd numbers in your post?

Mike

All of his Posts are that way and I had been thinking I was the only one that could see it?!!?

As far as long range accuracy is concerned,in regards to the 30-8mmRemmag,I was swayed towards the cartridge by a guy that won the Wimbeldon Cup. I yacked at him on the phone for a goodly spell and was really fishing for a 7STW,but he nearly begged me to do the 30cal version instead of. I've yet to be pissed at the chambering.

I took his advice and never had trouble finding most impressive accuracy,coupled with most Impressive "Oooomph". Without doubt it is my favorite long action 30cal and I've dabbled with a herd of 'em.

As range increases,speed is your friend,because it is what combats atmospheric conditions,as well as gravity. A little more flatshootedness(Technical Term),windbuckingness(another 'un),combined with heapooomphedness(yet another) and all wrapped around very serious accuracy leaves little to yearn for in a critter whacking chambering.

I personally dote upon the .505 BC 165XLC,as it can be pushed at break neck speeds and capably delivers the above attributes in the most impressive of ways.

If a guy has a particular brand of full length H&H brass he wants to ride herd on,he can fireform it in the 30-8mmRemmag's chamber,with only the press of the trigger. One can even use 300Wby Factory ammo,if so inclined. I'm sitting on better than 20 boxes of the R/P 8mmMag hulls and have had excellent "luck" with it and am not looking for a substitute hull.

Shoulda directed the rebuttal to rufous,but was siding with Rabid on the screwy number thingy,as it's pretty weird.........................

Seems like those number usually show up when you type the post in word and copy and paste it onto the campfire. It's happened to me before.

Sorry for all the weird characters folks. I usually write my thoughts in a Word document and then copy and paste into the post box. For some reason the inches and feet characters (" & ') give 7 bizarre characters. I try to remember to check for that but do not always get it done. I will try to do better. I did go back and edit my previous post so it makes better sense now. Rufous.

Big Stick, I will not deny that excellent accuracy is possible with the 30 STW. Of course it is. I will maintain however that it is likely more difficult to obtain for two reasons: harder to find quality cases and higher recoil. The greater the recoil the less likely most folks are going to shoot to the cartridges potential. On top of that I still strongly believe that it is a very rare hunter that could utilize what the 30 STW offers over the 300 Win Mag.
From all I know of you I do not doubt that you are one who can. But again will the extra velocity make any real world difference in your ability to place a bullet into the vitals? Not likely. Will it kill the animal any deader? Not likely. Rufous.

I thought maybe I was missing something <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />

Thanks Rufous..

Mike

My mind is more open than that.

When talking a long actioned 30cal,that doesn't mandate a 48" barrel to perform,I truly think the 30STW is the Meeeoww.

It's recoil isn't brutally magnified,as compared to the 300Winny and other less capacious 30cal offerings(300H&H and 308Norma,etc.). Nor is it's accuracy potential eclipsed by any of the other H&H belted rounds. I've had lotsa 300Winny's and respect it's abilities,but the funny thing is,all of that fondness was formed before I twisted up my first 300Super(grin). I've not bought/built a 300Winny since and likely never will,if only because the Whizzum is better than I'd initially speculated.

Looking back in retrospect,weighing gains vs losses,the full lengthed H&H based 30STW is an easy first choice to make.

My lightest 30STW is a true pussycat on the shoulder and hauls some pretty serious ass via it's 26" tube. It was purpose built and capably handles that niche. My intent was a long range hammer,that was portable and shooter friendly. It shines in that role and that'd be an understatement.

She was sooooooo spectacular that I retained it and offed my "big" one(SUCKS based,30" tubed,McMillan A2 stocked,blah,blahh,yadda,yada,yaadddaa).

Coming full circle,it's the VERY rare Hunter that could fully extoll the inherent virtues/capabilities of the "lowly" 308Win or "lowlier" 7-08,but that weren't the crux of this discussion.

No matter what a guy sports,it's practice that largely dictates the outcome. In other words,you make your own luck and a guy with a 30STW can be "luckier" than most and fantastically lucky on the average,should he yearn that end result.

'Tis a great cartridge IMHO................