Congrats on finding a great deal. I like finding those unexpectantly, too bad most times for me the next cheque is not in the bank yet, lol.
The 300RUM is definitely a thumper on Game and on the range, though I doubt you'll remember the recoil on game at all.
I think these hot .30s sneakily fall into the catergory that most of us still consider just another somewhat average big game rifle, but forget they are pushing into punishing territory on the bench during sight in or practice session's.
Chuck Hawks recoil chart shows it at around 33.0ft/lbs of recoil. The .270Win in a light rifle I'm finding these days to be stiff enough at 17.0ft/lbs for me. My old 7mmMag 175 Moose loads were screaming at 3050fps so around 28ft/lbs. The 300RUM would definitely be nasty for my shoulder on the bench any day of the week.
I'm sure it will shine on those 300 yard shots or more, being able to still deliver lot's of hydrostatic shock and probably a downing shot on a standing chest hit moose quickly and what some consider a more humane dispatching. Some will tell you just make a light hole and they will eventually die, and they always do, but I believe that's a little archaic on the largest North American deer in this day and age, unless you limit yourself to the shortest ranges possible.
Be careful with your barrel during sight in's, practice and load development,..you probably already know this,.. allowing plenty of cooling between shot's. Some say it can develop accuracy debilitating throat erosion in as little as 300 rounds if fired quickly due to it's large powder charge and small bore. It's definitely the king of the 30Magnums and therefore would be considered the crème de la crème of the long range Large Deer family rounds.
My old 7mmMag still has a decent bore on many more rounds, and they were hot loads, but it was a Big game rifle only so as little bench work as possible after sight in. Shoot the RUM the same way and it should give you years of reliable Big game downing even way over there into the next clear cut.
