In the midst of playing with this thing and killing a couple deer with it this year I realized I really like the 300 win mag so I want one that will last .
"Last"? What does that mean? How long will it last? It's a tool, with moving parts and it will wear out, eventually ...... Depends upon how much you shoot it: You can't re-barrel it .... the barrel is press fit to the action ..... once accuracy starts to fall off because of wear (throat erosion, most likely) ..... it's "done" ....it's a disposable rifle ..... and even that "standard" (accuracy) means different things to different people ..... competition benchrest shooters think a barrel is "shot out" after as little as 6-800 rounds ..... I've seen my own best groups with the original barrel on my 1958 270Win Remington 721 go from under an inch to just over 1 1/2" in 20 some years.... couldn't tell you how many rounds .... I've had days where I shot 250 and years when I shot about 100 .... It's getting about that time, I think .....
..... but how much do you shoot, really? Do ya shoot a box (20 round factory ammo standard- I reload, so the smallest ammo box I got is 50) or two before deer season and that's all? If so, that sucker will last you forever, even if you outlive Methuselah ..... also ..... if recoil is an issue, then a different stock might help - major factors in perceived recoil are indeed, weight of the gun, ( stocks are major part of this) physical fitness of the shooter, (mostly ignored these days, IMO ) , and stock fit ..... if you have good form and stock fit, and good physical condition.... such that you have a good cheek weld with correct sight height and can actually hold onto the gun ..... your gun and whole body recoil as a unit....
... the 770 was made/designed/marketed to the lowest price point possible, but it's more than adequate for the average consumer ..... most people will never shoot the gun they bought very much..... certainly never enough to find out if it's mechanical accuracy potential is falling off ...... so .... what's the answer? Do you spend money on a stock, or buy another gun? ...
..... I'll defer to the Wise and Experienced Col. Jeff Cooper, when asked, "What is the Best Rifle?" , answered thusly:
"Why, the one you HAVE, of course! Rare is the marksman that can shoot up to his rifle."
The shooter is always the weakest link in the "platform" ...... you could do a bit of research .... but I'll give you the cliff's notes: Shoot your gun from a bench with a lead sled..... with whatever load perfect conditions ...... measure group size ..... now try to beat that, from field positions, under time pressure ...... you may never get there, but if you work at it, I guarantee you'll be a better practical shooter...... and you might need a new gun, eventually.