Home Forums Hunting & Shooting Custom Rifles & Wildcats The 7mm Mizzum

Bob,

I have killed a pile of deer sized citters with 160 Sierra Gamekings in a long throated 7mm Rem Mag using max loads of R22. This is a pretty tough bullet and it pretty much exists every time. I substituted it for a 160 Nosler Partition for use on paper and later tried it on game. Frankly,I never could tell them apart,quick kills and exits.

John Barsness uses the same bullet in his 7x57 and speaks well of it.

I also used the 150 Sierra Gameking out of my Custom 7mm Weatherby for long range deer and antelope. It has worked well at what I consider long range,350 to 500 yards. So far nothing has walked away from one of these either.

Hope this info will be useful.

RD

Yes it is Britt;thanks for that. I have been burning Partitions to get to a hunting load,but if that Sierra works I may run those....got several boxes.

That is a good looking rig, I hope it turns out to be a lucky rifle for you.

Why the 175gr Bob?

StrayDog: Thanks! It gets its first run in Wyoming on the 15th.

Mike as you know,about everything in 7mm works good in a big 7,provided bullet structure is suited to the task.This leads to a lot of jumping around One bullet for a bunch of tasks has its' appeal.I have used the 140 and 160 a good deal in the past,but not the 175.

I won't stick strictly to the 175(I'm taking 160's to Wyoming),but keep in mind that it certainly has a lot going for it....a high BC,noted for deep penetration,reliable expansion,and suited to anything you can use a 7mm on.

Plus this cartridge(in truth most all 7 mags) starts it fast enough to qualify it for long range(at least my brand of long range)on about anything.....its' trajectory started at 3050 matches pretty closely to that of a 300 Weatherby 180 Partition started at 3150-3200 or so.Flat shooting and hard hitting enough for any rational purpose and still manageable.

I also have a bunch of 160 and 175 BBC's that I will use.And none of this prevents me from using a TSX,etc. I even have a box of 150 Etips downstairs

Good Morning to you Bob.


Yet to try a E Tip in my 7's.Prolly won't unless a box of 140gr slugs hit my hand.I used to be a heavy bullet guy myself..Know where your coming from.

I've been known to run a 175 Noz from time to time, it works, hard to believe I know...grin

My main stock has been the old Semi's, they shot very well and killed very well as far as I wanted to shoot.

Dober

Bob,
I havn't had much luck with accuracy from 175's in my 7 mm barrels. I use to load 175 Sierra and Hornady for my brother's Savage 110 and it loved them. It didn't make sense to me because his rifle had a 1-10 twist, which proves you never know until you start shooting the loads.

When I was a youngster in my 30's there was an older gentlemen in camp that had a Rem 700 and he shot 175 grainers for everything from elk to antelope. He had it zeroed at some long distance like 500 or 600 yards and just aimed a few inches lower on the animal at everything closer. Another thing that didn't make much sense to me at the time, but he was used to it and it worked for him.

4 a long time I used the 175 Semi for all that moved as well, may go back to it for a while as it sure has some panache..<g>

The 175 Sie has been a bit picky when it comes to accuracy for me but the 175 Horn has been incredibly stellar!

Dober

Dober I got a funny feeling that even in this day of super bullets, that old 175 might just be one of the superest of all.

That thing is as long as a panatella!


StrayDog; I struggled a bit with the 175,too in the 9twist barrel....until I figured what was going on...but they are shooting fine now,and this rifle puts them right there with the 160's at 300 yards.I could use them pretty much interchangeably.

There is only about 100 fps difference in the velocity between the two......so a guy scratches his head and says..."Geez,why do I need anything but the 175?"

yeah I've given a critter or two the old panatella dirt nap..grin

Dober

I have heard of the 7 MM Mashburn Magnum, and also a 7 MM Mashburn Super Magnum.

Are they the same cartridges?

I have a Speer Reloading Manual for Wildcat Cartridges, dated 1960. It has 7 MM Mashburn Magnum loads listed. This is where I got the Mashburn Magnum and Mashburn Super Magnum. In one place it is called the Mashburn Magnum, and a page or two futher on, it is referred to as the Mashburn Super Magnum. I have always wondered if they were both the same cartridge.

I used the 175 partitions on a variety of game in Namibia last year and they produced the nastiest looking wounds I have seen. You have to go to 375 to notice a consistent difference. I was shooting them at about 2900 and at 3050 they would only be better and flatter shooting as well. Reminds me of an old girlfriend who said "I am a sure thing and don't take advantage of it". Still have the big 7 but was stupid re the girl.

Bob,

Love that 7mm Mizzum!

Congrats on the new rifle! Hope is it all that you expected and more!

I assume as it uses D'Arcy's mag box that it holds 4 down?
How do you like D'Arcy's Legend stock? I am thinking about ordering one for a similar project.

I think it's reasonable to say we could use a few more pics of the rifle and perhaps a pic or two of the Mizzum round would be nice....and maybe a recently dead critter and the new rifle...?

Best Regards,
Dave

I would also love to see some additional pics of the rifle...

Guys I will do the best I can on more pics....and hopefully if I find the Wyoming buck I'm looking for I can get a dead critter .....I just got the rifle two weeks ago.

Dave there are pics of the cartridge that Skane posted.

123: I have read that Mashburn worked on at least two versions;a H&H length case necked down,and a slightly shortened version that was more efficient,and which he called the 7mm Mashburn Super.This is Dobers cartridge,and the same one used by Hagel and Page. It is the cartridge my rifle is chambered for.

Hagel writes that there was a 3rd one, which seems to have been a "short" version,which I guess no one liked either. It was the middle one,the one we are talking of here,that became the "Super".This was the one that is variously refered to as the Mashburn, or Mashburn Super.

Bob, good luck on finding that big buck. If you do get him, pictures please. One of my brothers is in Evanston now he'll be hunting soon, he too is on the trail of a big one. I'll join him later in the month in Utah when we'll be hunting elk and deer. In September I got a decent buck antelope just a mile or two or three from Evanston, but in Utah. As you can likely tell I'm ready, really ready to go.

superT: Thanks...will do my best to find one.