I have a Rem 742 with a 18 1/2 barrel that shoots reduced loads without any cycling problems. Having seen a number of posts in regards of jamming on this model and even on the newer offsprings I am wondering if my rifle is exceptional. I bought it used several years ago and wouldn't know if anything was modified other then the barrel which I had cut back.
The reduced load the rifle shoots without hangups is the minimum load from the 5th Edition of Sierra with 44.5 gr of IMR 4895 pushing a 150 gr. bullet. The manual shows a MV of 2600 fps from a 26" barrel.
With 7.5" less barrel I figure a MV out of the carbine around 23-2400 fps which puts it right alongside of a 30-30.
Has anybody else got a Rem. semi that does that??