RE: reloading a 300 Ultra-Mag
Bigcountry-95gr of reloader 25 is the load for one of my rifles but the other one actually uses 92gr of reloader 25.Both are pac-nor barrels but different chamber reamers were used for the two barrels.As a result one barrel has a much longer throat and in spite of 3 grains more powder actually produces the same velocity as the other rifle. I actually was using 95gr of an old batch of reloader 25 for my first rifle but had to cut it back to 92 with the new lot.The load development for the other rifle was done with the new lot and 95gr works well with no pressure signs.The 3 grain charge difference with the same velocity shows how much barrels and chambers can effect pressure and velocity.