I have a 20” Proof MTR in a 25 Creedmoor, and I don’t get anywhere near the speeds above. I’m currently loading 40 grains of H4350 in Alpha brass with CCI 450 primers. With right at 100 rounds on this barrel, I’m getting 2569 fps with a 134 ELD-M. Hornady’s load data says 40.8 is max, with a speed of 2800 fps. Since I’m 4” shorter in barrel length than their test barrel, I could probably safely push-up to 2700-2725 for speeds without pressuring out, but I’d be on the edge. With a 16” barrel you’re going to really have to step on the gas. I’m sure you could get higher speeds than I am seeing, but are the gains worth the wear and tear on your brass and barrel? I’ve also found over time that loading a cartridge to a mild level generally makes the load more stable and less finicky. Long brass life, and relatively easy on my barrel. Finally, I shoot 15-20 thousand rounds a year, and it plays out in real life that slowing a load down generally costs me maybe a tenth of wind at distance over a quicker load. Why push to gain speed when all I gain is a 1/10th better wind hold?