Longreach and Roper
The 300 WSM
is a proven 1k BR round with over a 3 year track record here in VA and NC areas. It seems to give very good accuracy with 190 and 210 custom bullets and longer barrel life than other magnums. Powders seem to be MRP and H4350. I shoot a BAT action with spencer barrel now in HG. I am getting 2980 fps with 210 JLKs.
Just built a new Python (LG) with Broughton barrel (5C rifling) to shoot the BIB 187 Flatbase bullets. Should be around 3050 fps. Have not had time to shoot it yet.
I have shot the 300 Win and WSM in comp. I will take the WSM from now on.
I also have a 300 WSM in a Win Coyote I use in the factory class sometimes. Seems to do about 10-16" at 1000. Not bad for off shelf hunting gun.
We have quite a few WSM comp guns and they are getting more barrel life than the Win mags.