Have a .264 Win. Mag. set up for long range bench shooting and I have a decent load using H-1000. Problem is that it doesn't come close to filling up the case (about 75%). I seem to have pressure problems using Retumbo so the next slower powder is H-50. I figure that I sould get a nice full case and still get 2900-3000 fps froma 140 SMK. Thanks in advance.