Yes, I have in both the .45 and .50 Encore barrels. The .45 had the 1:20 twist and the .50 the 1:28. Neither shot very well for me, not accurate enough I would trust them for hunting. No consistent groups and too many unexplained flyers.
The Encore barrels with the QLA (false muzzle) is basically a sabot shooting barrel which they do very accurately. I am currently using a .452/300 XTP in a Hornady crushrib sabot in the .50 barrel. I sold the .45 barrel.
My White rifles in .451 and .504 will shoot those big conicals with no problems.