Re: Benchrest Primers vs Standard
The following information was taken from "Rocky's Reloading Room" and may be helpful:
This table was developed using completely unscientific methods and reflect only my own best guess about the comparative “heat” of the primers shown. I prepared known consistent loads in .308 Win and .223 Rem cartridges, and changed only the primers in each test batch. Ten shots of each load were fired over a chronograph, and the results below are ranked purely by their respective velocities. It is assumed that “hotter” or higher brisance loads produce higher velocity. That assumption may or may not be valid and the results may change in any other gun, with a different load combination, different lots of components or under other circumstances. No pistol primers have been tested, and not every possible rifle primer style was available.
Note: “Hottest” primer at top, “Coolest” at bottom.
REM 9 1/2 M
REM 9 1/2
Of these primers listed I've used the CCI BR2 the most. I always get consistent, accurate loads with these. I've also used alot of the Remington magnum primers in standard non-magnum cartridges and found them to be good also. I worked up several "sweet" loads for the .22-250, .243 and .25-06 with these. I recently tried the CCI 250 w/H1000 in my .300WinMag and that combo worked out great, but I have used CCI BR2's in this cartridge also. Who knows?
Always work up into your loads and whenever changing components, drop your charge by at least 7% and start over. JohnnyK.