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Old 12-16-2012, 11:36 AM
ptmn ptmn is offline
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Substituting primers gets more dangerous when you are loading at or even near the maximum charge level. If I had a midrange or lower load and the primer was the same class, such as large rifle standard for a large ridle standard, I wouldn't stress about substituting. But understand that it does make a difference. Yesterday I did some load development with my 308 sniper rifle. In same gun, using the same case headstamp, COAL, bullet, powder/charge weight, but different primers, I ended up with a significant difference in group size. Using Winchester Large Rifle Primers, group size was .459" at 100 yds. Using CCI 34 Primers, group size was .792" at 100 yds.
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