std LR or Magnum LR primers in 7 SS (or 7 SAUM, 7 WSM, etc.)?

[Winny94]

If you shoot a 7 short mag variant, do you run standard or magnum LR primers? Im getting a lot of conflicting reports, and with a limited barrel life (and a proof CF barrel), id like to limit my testing as much as possible.

thanks!

 

[watercam]

Very good question. Magnum primers were originally asked for by Weatherby for their .300 W. Mag. to ignite 80+ grains of powder. For me anything above the low 60 grain range would warrant Magnum primers in a hunting load. For match loads I would test standard LRPs out to 600-1000 yds. for best ES/SD numbers.

 

[can1010]

the guy that designed the 7ss uses only fed 210s. and to be honest I get better consistency in the 7 saum, 284 win and my 6.5 prc with standard large rifle primers

 

[ben_g]

I use BR2’s in 284, 7 SAUM and 300WSM

Results have been very good for me (used for F-open) that I haven’t yet had cause to try another primer.

 

[benchrest]

7wsm i ran 215M magnum match. (69gr load)
&
7saum likes BR2's (60gr load)

 

[FrankG]

I say you won’t know till you try and see what your gun/load likes.

I wouldn’t even given a thought to trying CCI200’s in the .300PRC till Dave at work told me how excellent they where in his .300wm.

My extreme spreads dropped to about 10 and sd’s to single digits. Better than 210M’s and better than mag primers and I’m loading mid 70’s for powder charges.

Later, Frank
Bartlein Barrels

 

[LoanHarvey]

I just started testing on a 25 SAUM today, and the 210M's gave me better groups than the 215M's. YMMV
This is with 60gr H1000.

 

[Willow]

Dependent on each barrel and powder combo to be honest. I know a guy here in Aus who has taken out a couple of Queens titles recently who runs CCI200's in his SAUM and his group size shrunk significantly when he switched to them.

 

[rhovee]

I run H1000 and about 65 grains of it in my 7 saum shooting 184’s. One barrel likes cci 250. Still trying to see what one is more consistent Fed 215 or cci 250 in my 28” barrel.

 

[wboggs]

F210m shoot better groups with better ES/ED numbers in my 6.5PRC with 60 gr H1000. Accuracy really suffered with 215m.

 

[Lbart]

Been using Wolf standard primers in my 7/270 WSM w/ Berger 180 & 184 hybrid loads for about 10 years with H-4831sc. 60+ grains. No problems, great groups @ 1k and low ES & SD's.

 

[mac86951]

I agree; primer selection is like bullet selection; try them and work up.

I'm happy with F215M for what it's worth.

-Mac

 

[Longrange57]

I agree; primer selection is like bullet selection; try them and work up.

I'm happy with F215M for what it's worth.

-Mac

7mm RSAUM, H1000 and CCI200....excellent results!

 

[Dgd6mm]

My 7RSAUM loved H1000 and LR primers.

 

[JPS338LM]

F210m shoot better groups with better ES/ED numbers in my 6.5PRC with 60 gr H1000. Accuracy really suffered with 215m.

Have had the same issue with 215Match primers in a 7SS. Could not get better than a 1 inch group at 100m 3 in one hole Andy 2 thrown out almos an inc away. Changed to Murom competition magnums (believe they are Wolf in US.) as well as cci250’s and accuracy was suddenly top notch 1/4 MOa. Also using H1000.

Will give the 210match primers a go and see how they run. Shoot them with good results in my 284Win’s.

 

[whatwind?]

7/300wsm 215m

 

[ShootDots]

I have tried CCI BR-2s, Fed 210s, and WLRS>>>>>>I have also tried Fed 215s, CCI 250s and WLRMs all in the 7SS and .300WSMs. My findings are sort of let's say almost unbelievable! Not only did the "standard" primers shoot better than the mags, they actually produced MORE velocity! I don't know the internal dynamics of what transpires in a "short-fat" case, however, it must be vastly different than in a LONG magnum case! I never experienced slower velocities from a 7mm Rem. Mag. or .300 Win Mag or my .300 RUM from using magnum primers!