7 Saum (7 Sherman): Std. Large Rifle Or Magnum Primers?

[Winny94]

With barrel life and components limited and expensive, im trying to limit load dev. Just taking an informal poll to see what the majority run.

 

[Vitali1342]

I use BR2 primers in 7SAUM and 7WSM . Great accuracy in both with low SD's 4-7 ft/s.

 

[MangoFett]

I've only seen accuracy issues on paper when dealing with h414, for whatever reason it hated br2 and hated gmm primers but when using magnum primers it shot fantastic. The SD sucked but group size was great at 100 and 200 yards. With extruded powder I've never seen a difference though

I'd probably grab gold medal match magnum primers or the standard ones and just go with it. I've not done much testing with cartridges over 44gr of powder but I've seen the lowest ES/SD from GMM primers, followed not so close by br2 and normal CCI.

 

[Milo 2.5]

I've shot 210 M's in 7 saum for going on 10 yrs. I've never worked on a saum that liked the CCI 200 over the 210M, but have never tried BR 2's.
The only reason I'd ever entertain running a magnum primer is if I tried powders in the Retumbo burn range.

 

[bjay]

George garner said on 6.5 prc blogs theres no need for magnum or 215 primer for small magnum that loaded with 70gr powder or less

 

[Sheldon N]

I use 210M's.

 

[Seandradamus]

210m here too

 

[GrantB]

I go by the old 50/50 rule. Over 50 grains or under 50 degrees use magnum primers