sup

I am assuming the Nosler 250's are 44 caliber (.429) and the "brown" Nosler sabot the same. If they do load to "easy" that canaffect accuracy. See if you can find some"green" MMP's or Harvesters 44/50 cal sabots and try them.

I have a GM-LRH barrel but it is a percussion barrel - I shoot .451/260 grain Noslers from it with great success.

Good luck in your search...