What powder are ya'll having the best luck loading behind a 150 grain Partition in the 270 Winchester? I'm considering R22 or IMR 4320. I really prefer the higher velocities and load densities that the R22 is offering but how does it shoot?
I had the best luck with RL-22 and H4831sc when I used 150g bullets. I was using 57.5g of either powder. Velocity was 2950-3000fps out of my 22" tube. Accuracy was .5" to .75" at 200 yards.
i am using imr4831 with 58.5 grains. i am also using 130 grain interlock from hornady and i am shooting 3 rounds into a dime at 200 yards. the velocity is over 3100 fps if you need anything else about any other gun just email me at cycleboy91@hotmail.com
My favorite powder for 150s in the .270 is H-4831SC. I generally load 56-57 gr. Generally gives close to 2850 in a 22" barrel and 2900 in a 24" barrel, give or take a few fps depending on your gun and components used.