If you are going to use a magnum primer, make sure to back your powder charge off by 10 percent or so and see what velocities that produces. Here are some of the common magnum pistol primers on the ...

The rest of the load was CCI 250 primers and 68 grains of the old Hodgdon 4831 powder. (This was in 1965, ... The .270 Winchester vs. 7mm Rem Mag: Effectiveness at Long Range.

Previously, I have loaded CCI 350 Large Pistol Magnum primers to shoot the Enforcer/Speer load and Hornady 200-grain XTP loaded with 2400. The CCI and Winchester primers produced nearly the same ...

The amount and type of propellant the .270 burns approach the borderline of requiring magnum primers. Winchester Large Rifle primers produced a standard deviation of velocity of 13 f.p.s. firing ...

Winchester also released the .270, 7mm and .325 WSM cartridges, as well as the .223, .243 and .25 Winchester Super Short Magnum (WSSM) cartridges, but the .300 WSM is far and away the most popular.