So far my Whelen has shot everything very well, in fact I did not expect under MOA accuracy with such regularity using powders From H322 to IMR 4350.
They seem to often shoot quite well in my experience too. Have had great loads in the past with AA 2015, H 322, Varget, RL 15, Big Game (250's and 275's) and most recently IMR 8208.
