Al,
I've had a 742 carbine in '06 for 37 years. Shoots fantastic; however, if you reload, you must stick with the medium burn rate powders, ie, IMR 4895, AA2495. Use the M1 Garand data. The gas system will not function well with the slower powders that works so well in the bolt guns, ie, the 4350s, etc. Also, if you are a "lefty" watch for the brass ejecting down your shirt sleeve. I got a scar from that one.
Doc