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7mm vs 7stw vs 7rum

 
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  #8  
Old 08-25-2008, 08:12 PM
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Re: 7mm vs 7stw vs 7rum

I cannot speak for the 7RUM,but I do have a 7mag and a 7mm STW.First off the 7mag is by far the most efficient and really makes the others step it up to beat it.IMR-4350 is my go to powder for the 7mag.I get ave. chronogragh velocities of 3250fps with the 140gr,3200fps with 150gr and 3150fps with 160gr. out of a 26" barrel.I recently aquired a 7mm STW with a 26" barrel and have been doing some load testing With H-1000,IMR-7828 and Winchester WXR powders using 150gr bullets.I am getting around 3250fps with my loads using H-1000 and IMR-7828 and could squeeze maybe a 100fps more out of her with these two powders which are very similar.The Wichester WXR gives me the highest velocity,I'm not sure how much more I can get out of it,but I'm satisfied,I'm getting 3450fps with the 150gr. bullets.The 7mm STW will out shoot the 7mag,but it takes about 15grs. more powder to do it.
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  #9  
Old 02-22-2013, 12:35 AM
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Re: 7mm vs 7stw vs 7rum

Kirby or any one else out there have experience polishing throats every 200 to 300 rounds? I read some data on the 6mm Competion Match chambering and they were recommending polishing the throat every 200 to 300 rounds to extend barrel life and were using JB. I have a 7mm Dakota and I plan on shooting the barrel out either this season or next and it only has 30 rounds down the tube right now.
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  #10  
Old 02-22-2013, 12:50 AM
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Re: 7mm vs 7stw vs 7rum

My 7 rum will shoot 180 hybrid at 3200, shot under 10" at. 1760y
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  #11  
Old 02-22-2013, 05:48 AM
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Re: 7mm vs 7stw vs 7rum

well said
Quote:
Originally Posted by Fiftydriver View Post
I have not done head to head comparisions between the 7mm WSM and 7mm Dakota but I can tell you from the couple dozen rifles of each I have built, in same length barrels, loaded to similiar pressures, the 7mm WSM WILL NOT outperform the old 7mm Rem Mag.

It will come within 50-75 fps with same length barrels but it will not outperform it on average and the heavier the bullet you use, the more advantage the Rem Mag has over the WSM. The problem today is that the 7mm Rem Mag is down loaded so severely to make the STW and RUM look better on paper.

If you look at factory load levels, yes the WSM outperforms the old Rem Mag but when you realize that in proper handloads, the 7mm Rem Mag will do anything the 7mm Wby Mag will get you, it clearly shows you why it outperforms the smaller WSM.

Its easy to manipulate numbers to make a smaller round look more impressive then a larger one, that is basically what has happened with the WSM hype. Do not get me wrong but most of what is told about them, even by their manufacturers is hype in one way or another.

While the WSMs are close enough to the standard belted magnums to combine them in the same performance class, they will not outperform the old rounds. Its just not sexy to say "The 7mm WSM comes close to the 7mm Rem Mag".

The 7mm Dakota, its a potent chambering. Its only limitation really was that the old brass was pretty soft. It is a ballistic twin to the 7mm STW, nearly fps for fps in same length barrels and with same weight bullets. Hornady is supposed to be making the new brass and I have heard its much harder and will take more firings per case. That is good news.
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  #12  
Old 02-22-2013, 04:47 PM
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Re: 7mm vs 7stw vs 7rum

Fifty driver is dead on on all accounts. The comparison and differences between the , 7 mag, 7 STW, and 7 RUM is a interesting discussion. Let me say, that right from the git go, I am a staunch supporter of the STW, and the 7 Mag as well. The 7 RUM really didn't catch on, as in anything else, you can have TOO much of a good thing, and the RUM is just that. It didnt shoot well for me, try as I may, and by the time I DID get it to shoot, the velocities weren't much over my STW's.
On average, I can get another 150-200 FPS over 7 mag speed, all else being equal, meaning bullet weight. The STW is SHOOTABLE, and accurate, and very hard hitting. The 7 mag, is a little slower, but not too slow, and recoil is very manageable. Actually, the recoil in the STW is also manageable.for extreme long range, go with the STW, and don't look back. But, the seven mag will not let you down either. TWO of the three you mentioned are excellent cartridges. IMHO.
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  #13  
Old 02-22-2013, 05:04 PM
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Re: 7mm vs 7stw vs 7rum

Kirby knows more about this than me but Ammo guide shows that the difference in case capacities is less between the 7 RM and 7 WSM than the differences between the Dakota and the STW

H2O capacities

7 WSM, 79.7
7 RM, 80.8
7 Dakota, 90.7
7 STW, 92.7

Maybe Ammo guides info is inaccurate?

With the advent of RL33, the 7 RUM could be a whole different animal.
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  #14  
Old 02-22-2013, 06:49 PM
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Re: 7mm vs 7stw vs 7rum

Quote:
Originally Posted by 7stw View Post
Fifty driver is dead on on all accounts. The comparison and differences between the , 7 mag, 7 STW, and 7 RUM is a interesting discussion. Let me say, that right from the git go, I am a staunch supporter of the STW, and the 7 Mag as well. The 7 RUM really didn't catch on, as in anything else, you can have TOO much of a good thing, and the RUM is just that. It didnt shoot well for me, try as I may, and by the time I DID get it to shoot, the velocities weren't much over my STW's.
On average, I can get another 150-200 FPS over 7 mag speed, all else being equal, meaning bullet weight. The STW is SHOOTABLE, and accurate, and very hard hitting. The 7 mag, is a little slower, but not too slow, and recoil is very manageable. Actually, the recoil in the STW is also manageable.for extreme long range, go with the STW, and don't look back. But, the seven mag will not let you down either. TWO of the three you mentioned are excellent cartridges. IMHO.
Amen Bob on the 7mm STW!
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