What 6.5 cartridge will comfortabily shoot, with multiple powders (not just RL 26 because that is hard to find these days), a 140-143 gr bullet, from a 24 inch barrel, at 2900 to 3000 ft/sec the most efficiently...meaning the least amount of powder (least amount of recoil)? And preferrably without having to run super hot loads the whole time. Maybe a quickload question? I'm going to build a 6.5 rifle and the 2900 ft/sec mark is what I want to achieve in a 24 inch barrel, and want to use the least amount of powder to get there. Options I'm currently looking at are 6.5-284, 260ai (maybe stretching it with just a 24 inch barrel), 6.5-06, etc. I don't care to go over 3000ft/ sec so options like 264 win mag are probably out.