I will be reloading 300WM with H-1000 and 190gr bullet. Application is long range big game hunting. I'm currently shooting a 26" barrel but am considering going shorter...maybe down to 22". However, I've read that with slower burning powder and heavier bullets you need to make sure your barrel is long enough to get complete combustion. With the combination above and a 22" barrel am I at risk of incomplete combustion? Any advice on what length would be okay? Thanks.