I got lots of parts here to build a hunting rifle. I'm trying to get to 2920-3000 fps easily with 180 bergers. My 280AI falls little short with the 180s and a 25'' barrel 2880-2900 fps. Don't want to go to a belted mag. What else is out there that will do what I'm expecting with the most efficiency. 7saum 7-300shortmag 7lrm ????? will these work or what else am I missing??