7 saum

mijp5

Gunny Sergeant
May 7, 2009
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#51
Is the Norma brass not doing it for you? I got 200 pieces for christmas but still waiting on the barrel
 
Apr 8, 2013
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#53
Powder speed and barrel length play in. I did testing with mag primers and lots of spread in my ES and SD. I have found that I typically don’t have good luck with mag primers in anything shooting less than 70 grains of powder. Check or the article, similar findings to mine.

http://www.rifleshootermag.com/reloading/magnum-primers-for-non-magnum-loads/


I noticed a lot of you guys' loads are with standard LR primers. Any strategy with this or is it just what you have on hand?
 

mijp5

Gunny Sergeant
May 7, 2009
3,959
992
113
#54
Well that’s good to hear because I have a ton of lr primers I don’t have a use for in anything else
 
Feb 21, 2013
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#55
7 saum is gaining a lot of popularity in F-class. Berger supports F-class a great deal. Lapua and Berger are now affiliated with one another so....
 
Apr 8, 2013
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#56
I was surprised at how good the Norma brass has been. I typically run Lapua but they are not playing the short mag game yet, so I went with 100 pieces Norma. No culls, no complaints. That being said. I have emailed Lapua. They essentially said they have had lots of inquiries, especially on he 7 SAUM so in the future they could start producing it so fingers crossed


7 saum is gaining a lot of popularity in F-class. Berger supports F-class a great deal. Lapua and Berger are now affiliated with one another so....
 
Apr 8, 2013
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#60
Played with the load today. Shot over my chrono and by my buddies labradar. Found my best load for the 162's. 3210 fps average with 13 ES and 6 SD according to the LabRadar. 3218 fps average with 12 ES and 6 SD. This was at 64.1 grains of H-1000 .005 off the lands. Shot 2 groups of 0.25" @ 100 and one group of 0.20". Going to 1,300 yards next weekend will report back after that.

The 65.5 grain load (same as the 3327 load from last week) was 3301 FPS average 31 ES and 13 SD with Labrador and 3319 with 28 ES and 13 SD on my chrono. So no malfunction on the chrono's part. Just a slick barrel I guess. 3 groups were all between .3 & .45" No pressure signs at all.

Going to go with the 3210 load due to the group size and SD. Loading up 50 for next weekend. The other 50 will by my 180 Eld load going 2930. Depending on how they perform I'll narrow down to the more accurate load then try for 1,760, 2,000 and 2,500.


I have been shooting a 7mm saum for years. I currently have 7 barrels chambered and ready to go for my 2 full custom 7mm saums. I have also shot out several . I change my own barrels etc. I say this to prove how familiar I am with this cartridge . Speeds of 162 grain bullet at over 3300 is either from an extra long barrel 32-34 inches, a result of a faulty chrono or excessive pressure. I would hate to see people try to duplicate that speed as it would be down right dangerous. I am sure you will hear from others.
I’ve had friends with 162s going 3000fps from a 22” barrel pretty reliably.

At 30” barrel assuming 25fps per inch of barrel that would put you around 3200fps give or take depending on load and barrel variable.

I agree to get to 3300fps you’re looking at a probable chronograph error, really long barrel, a barrel that’s a freak of nature, or loads are really hot.

Not saying it’s impossible but something doesn’t add up at first glance.
Your 1.948 coal seems really short especially with 65.5grains of powder. I’m not even sure that’s possible.

Brass length alone for my saum cases measure 2.020” after turning and trimming.
 
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