.458 Winchester? I've owned both through the years, and they both can be classified as "thumpers", especially the 458
I have one, purchased it from the original owner
He shot less than 10 full power 458 Win Mags through it, standing, before deciding it was too much fun. I have shot around 50 45/70 "equivalent" loads . It was a total failure. This rifle will not shoot cast bullets at all. I think it is due to a long throat, reamed that way to reduce pressure and allow Winchester to have bragging rights in the elephant gun class. The rifling is also shallow.
M70 Winchester Classic 22" barrel
405 Gr LRN 458 cast commercial
40.5 grs AA5744 wtd lot 1-2004 OAL 3.15" Fed 210S Win cases
23 Feb 2018 T = 80 °F
Ave Vel = 1491
Std Dev = 23
ES = 64
High = 1526
Low = 1462
N = 6
heavy external grease, some leading last 2" of barrel. Poor accuracy
405 Gr LRN 458 cast commercial
41.0 grs AA5744 wtd lot 1-2004 OAL 3.15" Fed 210S Win cases
23 Feb 2018 T = 80 °F
Ave Vel = 1533
Std Dev = 27
ES = 89
high = 1604
Low = 1515
N = 10
three shots touched 8.5" X 11" target.
405 Gr LRN 458 cast commercial
42.0 grs AA5744 wtd lot 1-2004 OAL 3.15" Fed 210S Win cases
23 Feb 2018 T = 80 °F
Ave Vel = 1588
Std Dev = 27
ES = 76
High = 1638
Low = 1562
N = 9
nothing near 8.5" X 11" target, bullets landing feet away from aimpoint. Barely holds 6 foot by 6 foot frame.
I may experiment with paper patch, I have little to no interest in firing full bore loads. Decades ago, I was given a Ruger #1 in 458 Win Mag to shoot. I shot it kneeling. The first shot was a surprise, the second shot hurt so bad, I still remember how bad it was. This is something everyone should do: get burnt badly so you remember, to fear fire!