Here is the start of my work on the .284 160 SBD-2's in a 28 Sherman, 26" Wilson barrel, 8T. I was running hot loads with Berger 195's getting 3168 fps with N570. My barrel took a beating on it but it is surprisingly accurate still. I have since switched goals for hunting and bullets. While taking deer, elk and antelope beyond 1000 yards has its place, it is not something I personally want to do anymore. So I have found my sweet spots of 830 yards and in. Closer the better. With that in mind and that I no longer use the bench for testing as I want to simulate hunting conditions as much as possible, here are my goals.
160 SBD-2's running 3100 fps or slightly faster using H1000. Keeping my barrel alive for as long as possible.
Hit 10" steel out 1000 yards with 80% hit rate, shorter distances need 100% hit rates with 5 shots.
I shoot from a tripod arca system. I mainly hunt at 6000ft and above.
At my range on the 7th and 33 degrees I was running the 160's 3128fps. My range has metal hanging at 539, 616 then out to 1059, 1132 and 1145. I need to go up in the hills to get to the 700 and 800 yard target setups. My first 5 shots at 539 steel were all hits. I could not tell my grouping since the road out to paint the targets was a mess. Seeing the hits in the scope was good enough for initial work. I had 5 hits at 616 as well.
These bullets fly great so far. I will test out to the farther targets next trip to the range. I will try to post photos as well. This performance should be similar for the 28 Noslers I have built. I will run the 160's out of some 7 SS's I have to build as well.
Hope this info helps anyone in the .284 crowd.