I have a National Ordnance M1 Carbine with a Wolfs spring pac installed that functions great with 11.5gr of 2400. My problem is that my local gun shop is having a problem getting in more 2400 in stock. He said there is a nation wide shortage of this powder. I then tried 12gr of IMR4227 and started to have FTE problems. I also tried 6gr SR-4756 and had even more FTEs. My local gun shop does have H110 and WW296, but my Lyman 4th edition Cast Bullet Handbook has no loads listed for these two powders. Does someone have a load that I can work up on?