That is a very good point and I do understand the difference. My goal was to safely approach their velocities. I didn't have specific powder in mind so I wasn't worried about duplicating their load. I spoke to Lehigh defenses rep about a week ago and we talked about their data. Falling that far short in velocity drops your energy by about 150ft/lbs +/-  At that point it almost isn't worth the effort. He also said they have no idea how Underwood gets there. I don't believe that's true   But from a legal standpoint I understand his statement and I would do the same in his position

I apologize if this has been addressed previously. I would like to load the 140 grain xtreme penetrators and get as close to underwood velocity as possible. It's too expensive to buy from them. Now I clearly want to do it safely and within pressure limits. I would like to know if anyone knows how they do it or has a load that gets there.
Thank you