As to recoil for the 300 Win mag, I wouldn’t worry about that at all. My first .308 magnum was the 300 Dakota, which I still love (slightly faster than 300WM for all bullet weights). The 500 Jeffery did get my attention, so recoil is real.
If you’re going to do a long range session with a magnum cartridge set things up for your comfort. Ear plugs AND headphones. Get yourself a shooting vest made for mitigating recoil: it has a plastic panel sewn in where the butt meets your shoulder which spreads the recoil impulse. Put a small sandbag between the butt and your shoulder. The more you shoot it the easier it gets.
After shooting large bore cartridges for years, another hunter let me shoot his 458 Win mag, with the warning “it really kicks”. It was a pussy cat compared to my 404 Jeffery handloads.