there just aint no sense in that!!!!!

Hey! I tried it one time only when I bought the early Moss 835
and that's what I said...there is no sense in this! 3" is more than
enough.

I have a Moss 835 and one time I shot a 3 1/2 goose load off a bench ( I was testing if it would work as a turkey load) and I would have to rate it as bad as a 416Rem a friend let me shoot. Standing up a 3 1/2 load wasn't as bad but now with Hevi-shot and the other new shot I use 3 in shells. Off the bench my 300 Win mag I get about 40 shots before it is enough it is heavy with a good recoil pad, I learned to shoot with my fathers 03-A3 Springfield but it had a short stock and a metal buttplate and I would say it kicked harder than the 300.

My worst is a 3.5" Browning BPS 12 gauge. Using the 2&5/8 ounce turkey loads from Nitro and a .660 Rhino choke, it is brutal off the bench but not too bad under field conditions.

Based on the most poular bullet weight for each rifle you mentioned the results are:
30:30 10.6 ft. lbs.
308 Win 15.8 ft. lbs.
270 Win 16.5 ft. lbs.
30:06 20.6 ft. lbs.
45:70 23.9 ft. lbs.
12 Ga 2 3/4" and 3" 17-54 ft. lbs.
20 Ga 16-35 ft. lbs.

Imagine a hot rodded .450-70 (smokeless load.) Numbers are pretty similiar for the two.