.221fb Striker

When Sinman gets the barrel back to me, want to try some heavy bullets in a .221fb. It will be screwed on a striker action with 14" barrel, 8 twist. Haven't found data for bullets over 50 grain, and those shoot great. Is there enough case capacity to seat some heavier bullets? The 50 grains may be enough for steel anyway, new to shooting striker.

If you can load them out a little I would think there is enough case capacity, you might use a little slower powder than normal, Lil Gun, H110, IMR4227 might be a little fast for heavy bullets.