I bought 6k Wolf SRM primers awhile back and have loaded about 1,200 using Win. 748 and shot about 500 of them without any problems. When I ran out of the Win. powder I decided to get a 8lb jug of WC844 from Winders trying to save some money. Well today I loaded up 40 rounds to start my work up and had 6 fail to fire with good deep firing pin strikes, non of the 6 would fire on a second try. This was with 2 different AR's that have had no problems with until now. I have not had a chance to pull them down yet but it's on my list for tomorrow. I just finished searching the net and found a few others with similar problems. I guess it's the powder primer combo. If it is what do ye ol reloaders think I should do? Sell the powder and buy a jug of 748 or sell the primers and buy some other brand? I do have a few CCI small rifle magnum primers laying around. I thought about loading some up with those and see how that works. Just to make sure my problem is what I think it is.