I have had hang fires with standard SR primers in the 6.5-47 using ball powders.And VV 540
Running CCI-450 SR mag primers i've been down to 25 degrees with no issues.
IF your hunting.
Run the large primer version.
IF your running BR.
SR primers are the ticket.
IF your stuck on the small primer version for hunting.
Test it before you trust it.

dave



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Only accurate rifles are interesting.