Well the can of worms is open..... for factory loads, the above mentioned PMC is safe, as is Winchester USA "white box" and Remington UMC, both are 150 grain loadings that essentially duplicate M2 ball. Black hills 168 match is also designed for M1's, but there isn't a Canadian distributor for it (that I know of) US match loadings use 172 grain bullets. For powders, it is best to stick with IMR or H4895, and IMR 4064. Do not use any factory loads not listed, even if they are only 150 grain, as the powders used have the wrong pressure curve. Also keep in mind that loads in modern loading manuals, even with the powders I mentioned are too hot. M2 ball only chugged along at 2700 fps or so.