C-130, 577 was a 19th century British army calibre, TBH the ammo we used , as far as I know, was original and, TBH, I wouldn't have known the weight of the bullet. Wiki has it as 480 grains at around 1300 fps and it was introduced in 1867 so the ammo was getting on for 100 years of age, sacrilege to use them really, but you know what teenagers are like.
The British later necked down the case to 45 and the 577/450 round, a contemporary of the 45/70, evolved.
I can't remember what the recoil was like back then in 1960 but a friend of mine has a snider in 577 and a martini enfield in 577/450 and the Martini recoils much more and is very noticeable; the snider recoils like a low brass 12 gauge, I last fired that rifle about 3 years ago and can't remember the recoil as being excessive but I can remember the martini as giving very noticeable recoil.
My friend loads them with black powder so not only do you get a kick in your shoulder, if the wind is in your face you get one in the back of your throat if you breathe too quickly after the shot.
HTH