7 mm SHERMAN SHORTMAG vs 7 SAUM

Kimber7man

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This is a great thread, very informative. I’m sitting here with a Defiance medium action and wondering what to build when I already have a 6.5 SAUM, 6.5 PRC, and 7 SAUM rifles in the stable! A SS sounds fun!
 

ruby76

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This is a great thread, very informative. I’m sitting here with a Defiance medium action and wondering what to build when I already have a 6.5 SAUM, 6.5 PRC, and 7 SAUM rifles in the stable! A SS sounds fun!
A Sherman Max would make the most out of your action.
 

Rardoin

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In the 7 SS VihtaVuori N165 has been working really well with the heavies- Berger 190 LR Hybrid and the Hornady 190 A-tip.

I've been focusing on the A-tips since I am using this cartridge for long range target shooting (F Class- Open). I am running them with 60.0-60.2gr N165, 0.0015" neck tension, 0.032" off the lands (0.060" off works well too) and Vavg right at 2800fps in a 30" barrel. Just shot a 100shot/600yd match this weekend over 2 days. I had only 3 shots outside of the 6" 10 ring and 65 shots were touching the 3" X ring. A Berger 195gr hunting VLD/N165 would be a great choice in this gun for LR kills and could get over 2900 fps without trashing the primer pockets. Also, the single base VV powders in this burn range are exceptionally kind to the throat area.
 

elkaholic

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In the 7 SS VihtaVuori N165 has been working really well with the heavies- Berger 190 LR Hybrid and the Hornady 190 A-tip.

I've been focusing on the A-tips since I am using this cartridge for long range target shooting (F Class- Open). I am running them with 60.0-60.2gr N165, 0.0015" neck tension, 0.032" off the lands (0.060" off works well too) and Vavg right at 2800fps in a 30" barrel. Just shot a 100shot/600yd match this weekend over 2 days. I had only 3 shots outside of the 6" 10 ring and 65 shots were touching the 3" X ring. A Berger 195gr hunting VLD/N165 would be a great choice in this gun for LR kills and could get over 2900 fps without trashing the primer pockets. Also, the single base VV powders in this burn range are exceptionally kind to the throat area.
Congrats Robin! It sounds like you and the 7SS are a great match in F class.
Thank you for the good data on N165.
 

Rardoin

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Congrats Robin! It sounds like you and the 7SS are a great match in F class.
Thank you for the good data on N165.
Yes, Rich. The 7 SS has proven to be ridiculously easy to acquire a very good tune and easier than any cartridge I've shot to get an exceptional tune. I wanted to prove that a high BC 7mm could compete very favorably with the .30 cal short magnums at 600-1000yds without the recoil/percussion penalty that can be fatiguing over long multiday matches. It appears that it can do just that.
 

tbentz

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Hi all, new to the forum. Was going to build a 7SAUM but convinced to go with 7SS after reading this whole thread.

This will be my first custom rifle, and budget is pretty flexible.

Do any of you have a recommended smith in the northern Utah/Southern Idaho areas for working with on this? Or is there a remage option I haven't found yet?
 

elkaholic

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Hi all, new to the forum. Was going to build a 7SAUM but convinced to go with 7SS after reading this whole thread.

This will be my first custom rifle, and budget is pretty flexible.

Do any of you have a recommended smith in the northern Utah/Southern Idaho areas for working with on this? Or is there a remage option I haven't found yet?
Call Garrett Preece in Ogden. (Preece Precision)
 

Rardoin

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I just measured the throat on my 7 SS after not checking for over 1300rds. At 100 rds it was 2.465” and at 1427rds it is 2.483”....total erosion of 0.012”. That is the slowest erosion I have seen in any of my rifles. I am shooting a 190 Hornady and Vihtavuori N165 since about 300rds and H1000 prior to that. The cartridge design is about as perfect as can get for heavy 7mm bullets IMO.
 
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elkaholic

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I just measured the throat on my 7 SS after not checking for over 1300rds. At 100 rds it was 2.465” and at 1427rds it is 2.483”....total erosion of 0.012”. That is the slowest erosion I have seen in any of my rifles. I am shooting a 190 Hornady an Vihtavuori N165 since about 300rds and H1000 prior to that. The cartridge design is about as perfect as can get for heavy 7mm bullets IMO.
That is great data Robin. Thx for sharing!
A greater portion of the powder volume burns within the case with the 40 degree shoulder and short burn column. This makes the case more efficient and attains greater velocity in short barrels than normal. Add to that a .331" long neck and the flame point is more contained in the neck rather than in the throat, and eroision is reduced🙂
Here is some added good news.
Fully formed brass is now available 40 degree)
58080.jpeg
 

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