Re: 280 AI primer ?: Magnum or not???
I would recomend letting the load determine which primer
The only time I have needed the magnum primer was when
using 90 plus grains of very slow powder(50BMG,H870,ETC)
I always start with standard primers and work up(the cups
are thiner and pressure is easy to read)
If you reach max pressure with low standard deviation you
have enough primer.
If the standard deviation is poor (20 fps Plus)then a
magnum primer may be nessary. but load down if you switch
from stanard to magnum primer.
Magnum primers will increase velocity but may lead to poor
standard deviation,s and this could be a problem at long
On long range rifle,s I try to keep a standard deviation
of less than 10fps.
I would think the 280AI should not need a mag primer but
recomend you chronograph each load to make sure.
Just an opinion [img]/ubbthreads/images/graemlins/smile.gif[/img]
J E CUSTOM