300 WSM 180 gr. superformance
300 WSM superformance
I could not find any data for 180 loads so I worked up some of my own. I have two 300 WSM s. A 700 Remington short action and a custom 700 long action.
In the short action I started with 68 1/2 grains of superformance with a 180 sst, 180 interlock SP, Sierra BT and a Ballistic Tip. Then 69, 69 1/2 and 70 grains.
SST 68 1/2 grains shot 2941 FPS. 2 inch, 3 shot groups at 100 yd. Seat 2.850 primers where not showing any pressure. Bolt was not tight or sticky. This load is safe in my gun.
SST 69 grains shot 2977 FPS. 2 1/2 in.
SST 69 1/2 grains shot 2987 FPS. 1 3/4 in.
SST 70 grains shot 3019 FPS 3 in. The primer was flat and the bolt was snug to lift. Make sure you start a few grains less powder if you try 180 loads.
All of the bullets shot close to the same groups and Vel. 70 grains in my rifle was a little hot. FYI 24 inch barrel. Fed 215M primer.
The custom rifle got better groups 1 to 1 1/4 in. and a bit more Vel. App. 40 FPS. more. 25 in. barrel. Seating 2.975 10 thousands from lands. It did not show as much pressure as the short action. FYI in this gun IMR 4350 is faster and groups much better. In the short action 100 V is the best powder in that gun.