I understand as well.....2 feet of drop at 400 is a lot. 7RM allows a lot less drop at 400 than 25".
Bob, pick the heavy for caliber bullet with all three cartridges, same barrel length, the top velocity in your chosen manual for each cartridge, and compare the ballistic tables, all three are going to run 20-23 inches of drop at 400 yds when sighted in at 200 yds.
I used to have all this stuff memorized--now I'm going to have to go check my tables to make sure I'm accurate!!!
Casey
