I had a tough time. The custom champion that I have used to win 3 American Hndgunner's with that has not failed in 50K rounds deicied it did not like the Factory ammo that I deiced to use. I have no idea why, we tinkered around but never did find out what it was. Then I took mu own loaded ammo back to the range Monday and to my greatest frustration 900 rounds later nothing, not a thing wrong. Go figure.