Now that we have the M1 Carbine mag set ups going, I'm going to take this back to the range with me and play around some more. I'm sure the bullet selection hasn't changed, but with a cheap mag set up available, it might be worth playing with.
Nice day for the 256 Win Mag. The 60gr cast loads fed 100%, but did not cycle the action (as expected). The 60gr JFN on the other hand worked fine once I swapped to an empty buffer. We still have some power to go on the reloads, so we'll step them up a bit more and do more Mag testing. Using the M1 Carbine mag set up, feeding was excellent!