My 1985 7X57 wasn't MOA, still isn't.
I got it used with less than 50 rounds through it, safety not working either. I fixed the safety issue, shot it, removed several channel pressure points, shot it, removed the speed bump, shot it, full-length bedded, shot it, did the bread tab free-float, shot it - all the same 1 1/2 MOA or a bit more with factory ammo. It kills....
Next step (after reviewing and if need be tweaking my work from several years ago) is hand-loading fire-formed brass and neck-sizing or just barely bumping the shoulder back.
It's all fun, but I've never had this much trouble getting a Ruger, Winchester, and most Remingtons (my .243 was a bugger, now MOA) to shoot better than 1.25 MOA just free-floating the barrel with action bedded flat, and trigger work as needed to 3.5 lbs or less.
But yeah, the 70 recoil lug is all the same among like-length actions.
I have one of those also... its stamped 7 mm Mauser.. got it used for cheap.. guy bought it and couldn't find ammo so put it up for sale...
after he had a gunsmith bed it, lightened the trigger, and added a recoil pad... I paid $300 for it, low miler to include a 3 x 9 Nikon Scope on top..
Sold the Nikon for $200, so have the rifle with $150 in it.
Darn thing thinks its a varmint rifle, instead of a deer rifle. Try 40 grains of 3031 with any bullet weight you desire, and see if that tightens up your groups... it sure did in my Ruger 77 Mk 2.. from 5 inch groups with anything, to half inch groups with any bullet.