magnum primmer?

[Doe]

got a ? fellow reloaders. Can I used large rifle primmer instead of large magnum rilfe primmer in my 7mm. Would it make a BIG defferent? Anybody! need your 2 cents worth. :-)

[beemanbeme]

If you're talking about a 7mag, I routinely use magnum primers in all belted cases.  If you're talking about a 7x57 or a 7-08, you'd need to shoot your rifle to find out.  Back your load off a couple of grains of powder and give them a try.  
The magnum primers are supposed to be "hotter", thus burning more powder quicker which changes the pressure curve of the powder.  
I have tried magnum primers in standard cartridges but never with any significant increases in accuracy.  Other folks say their experiences have been different.  So your mileage may vary.

[Redhawk1]

I have tried magnum primers in standard cases and standard rifle primers in magnum cases. Both ignited the powder and accuracy was not affected. But I try to stick to the recommended primer.  

[myronman3]

here is a quick tale....

working with my 270, using standard primers and imr7828.   burned like $#!* and velocity was about 2550.   switched to magnum primers, and burned clean velocity was and honest 2908 fps.   accurate as hell, too.

i imagine with some powders, it aint going to make a huge difference; but with some it can be huge.  use what is recommended for best results.

[tanoose]

Ive used both standard and magnum  primers in a 338 winchester magnum and a 45/70.  Never checked velocity differences with a chrony, but didn';t see any difference in accuracy , recoil or anything else. Same goes for large standard and bench rest primers  . I got the bench rest primers for free and i am currently using them in a 30/06 and 45/70 in these calibers i am seeing no difference  from the standard large rifle primers Later Tanoose

[Lawdog]

While I have never had a problem using standard primers in magnum cartridges I do know a couple of guys that did.  I really think it has to do with what powder you are using.  Slower burning powders require magnum primers for more uniform ignition.  Lawdog
 

[Doe]

Thank for your imput fellow it the 7mm mag. I'm uesing imr 4350 56.5gr 1-1/2 grain above starting load. Hope it'll burn OK? :grin:

[klong]

I routinely use mag primers in 223, and I shoot a lot of 223. I am shooting VV 540 powder ( which is slow burning for 223 ) behind heavy bullets. It really depends upon the powder you use. If you are near the max load, for sure back off a couple of grains when switching primers from or to magnums and between brands. You may find that accuracy has changed for better or worse. You should head to range to verify zero.