The Firing Line Forums - View Single Post - Is there REALLY a difference between primer brands?

reloader28 · November 13, 2012, 12:28 AM

I was screwing around 3 or 4 years ago with this same thing.

I used the exact same powder load, bullet, and OAL.
I'd load 4 with one kind of primer, shoot them over a chrono, then reload the same 4 cases with a different primer and do it again. I used Rem, Fed, Win and CCI's. I did trim everytime too to make sure the cases stayed exactly the same.

Its wrote down somewhere, but if I remember right, I got 200fps difference and 2" difference in group size at 100yds between the 4 brands.

November 13, 2012, 12:28 AM	#14
reloader28 Senior Member Join Date: October 14, 2009 Location: nw wyoming Posts: 840	I was screwing around 3 or 4 years ago with this same thing. I used the exact same powder load, bullet, and OAL. I'd load 4 with one kind of primer, shoot them over a chrono, then reload the same 4 cases with a different primer and do it again. I used Rem, Fed, Win and CCI's. I did trim everytime too to make sure the cases stayed exactly the same. Its wrote down somewhere, but if I remember right, I got 200fps difference and 2" difference in group size at 100yds between the 4 brands.