I used the M60 (cock on closing) and the M65 (cock on opening) S&L rifles in 7x61 S&H for many decades of hunting. One of the smoothest and strongest actions ever made. Apparently these actions have been tested to 120,000psi with no adverse effects. They have superb triggers and barrels which do not foul and are fast. The original Norma factory ammo with the 160gr bullet chronographed at 3050fps (3100fps factory spec) in my M60 with the 26" barrel and I had no trouble getting 3000fps with Sierra Gameking 160gr bullets in my reloads.
The 160gr Sierra bullets at this velocity really reached out and hit hard, but also performed perfectly at close range (might damage some meat but it was meat on the ground not still wandering in the bush.

Carefully sizing the cases to headspace on the shoulder gave good brass life. The Norma factory ammo was pretty sloppy in the chamber but it was very accurate and the original 160gr bullet in the S&H cartridges was a good killer. Not so the bullet Norma loaded in the later Super cases which was way too hard and mostly just drilled through deer. Norma promoted their new Super 7x61 with pictures of African game and I suspect they hardened up their bullets for this purpose, something I think was borne out when I sectioned an original 160 gr and a Super 160gr, the Super had shiny lead core (harder?) while the original had dull blue lead core(softer?).

I found it best to always load the magazine from the bottom, doesn't matter which side first just drop the 3 rounds in, otherwise they invariably didn't feed the first round if the magazine was charged from the top.

Only downside, and the reason I eventually sold the M60 I still had, was that with a 6x Kahles scope and a mag full it weighed 10lb. Nice weight to shoot but just got harder to lug around as I got older especially up in our Alps on chamois and tahr.