Standard or Magnum Primers

[JDY]

Shooting a 7mmRM 26'' barrel with 168 berger bullets, H1000 powder. Do I need magnum primers?
THANKS
JDY

[johnnyk]

JDY,
I would try both. I have used magnum primers when others said I didn't need to, which resulted in tighter groups. This was in non-magnum cartridges, .22-250, .243 and .25-06.
I think I read somewhere that Roy Weatherby had Federal make the No. 215 LMR for his cartridges which were burning over 50 gns of powder.
I use both in my 7mmRM, 26" barrel. JohnnyK.

[glassman]

When ever I go over 65gr I always use a Mag primer.

[LRHWAL]

I've generally had better SD's with STD in a 300 Win Mag up to 69grs of powder.

It really depends - shoot both - check the loads, check the SD's, check the groups...

Sorry - I've asked the same in the past and eventually found I really needed to try.

[30-06 boy]

i used to use fed 215match primers in my 300wm all the time.i asked the same question about the 300wm.now i start my load development with cci br2 primers(cci standard match)i do however try magnums too.i've shot 80 grains of h1000 with these.and have had no problems.i've seen published loading data that specifies standard primers in 300wm.i have not seen in published data 300 weatherby loads that specify standard primers.they all specify magnum primers.so i would think the 300 wm is the cutoof for standard primers.somewhere around 80 grains of slow burning powder.now your 7mag does not burn as much powder as a 300wm.try them see if they tighten your groups.i would be carefull developing a max load with standards then switching to magnums,back off your powder a few grains.magnums should develop more pressure.jason

[Varmint Hunter]

When standard primers are marginal on your average sunny day in May, how will they perform with the same large case of powder when its 12 deg in January? I don't know the answer to this question but it causes me to lean towards magnum primers for all hunting cartridges using 65+ grains of powder.

[30-06 boy]

i do all of my loading for my long range deer rifle after gun season.in jan,feb.i do this so the temp,air density,etc are as close to the hunting weather that i will be shooting these loads in.have no problem with igniton at 15 degrees using standard primers..jason