I would look into the lehigh bullets discussed on another thread on this site. The recommended velocity is 1200 to 2800. I tried the 250 grain bullet and it worked pretty good in my water test. I will be trying the new 175 grain bullets this week I hope. I shoot them into a water tank and a wet paper packs. The rest of the 375 bullet I have tried do not expand at my 375 JDJ velocities.