25 prc wold be a hit,but I think Hornady would priortize a new cartridge in thier favor somehow.My 17.75" xp-100 25 cm does 135 bergers at 2670 fps,and my first exprience with Hammer bullet 92 hammer hunters at 3250 and 121 HH just below 2900 fps,but crucnching h4350.dang, if I only had about 5 more grains of capacity.I'LL try again with 6.5 sta bil.I don't know much about Hammer Hunters,about 2weeks usage , but the ogive is much foward than bergers, maybe Absolute hammers would work better,I don't know.The92 HH made two thumb size holes at 251 yds,hitting ribs along the wayI,m impressed.
Anyhow 257r and 284win are difficult for short action magazines and long bullets.Saums,wsm, prc need mag bolt.
So if I was Hornady,keeping the ball in my court long as possible ,I'd make a 243 AI/260Rem AI neck to 25 cal , 25 souper Improved ,I think it should run in a short action,maybe 260 ackley fellows can answer that.My 22-250 tikka is waiting for a barrel change,most likely 25-06 AI