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Old November 3, 2011, 11:30 AM   #3
black mamba
Senior Member
 
Join Date: September 13, 2011
Location: SW Florida
Posts: 890
Cold weather is a big factor. If you're only shooting in 50° or higher temps then the standard could be OK, but for colder days afield you'll get more consistent velocities with the magnums.

Also, don't work up to max loads with the standards and then switch to magnum primers without dropping a couple of grains of powder. The hotter primers raise pressures.
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