N570 powder

[6.5x300 WBY]

.338/.378 weatherby - 285 Hammer hunters - 30" barrel - 110 grns N570 sea level = 3,100 fps. No pressure, extremely accurate @ 100 yds & 1,000 yds @ 2,200' elevation.
Only con is have to one shot, not even close to getting in mag. Like 4.106" OAL

Have you ever tried a mag fit load? My 338-378 Wby fb group says they have but IDK