I have one of these guns, in 325wsm. I dont have a bad thing to say about it, and those that have shot it seem quite impressed. I have played with a bunch of loads, however all loads have been with 200gr accubonds. Tried rl 17, 19, imr4350, and imr 4007ssc. The winner was 4007, with 100yd groups like you see below. Velocity was just above factory, at 3000fps with no pressure problems.
It is very flat shooting, and I had Dennis Sorenson put a brake on it, and that made a very big diff on recoil. Yes its louder, but we all wear good muffs so its not a factor.
I wouldnt hesitate to get another, and after comparing it to my bud's savage 300wm and rem 700 7mmrm, and a tikka t3 270wsm, this M70 325 is a winner when comparing groups, recoil, and long range Ooomph (we shoot 8" round 1/2" steel at 400, 500, and 600yds, the 325 def has the deepest penetration (but expected with the heavy bullet))
The long barrel (then add brake) isn't an issue for me, but to each their own!
I have stripped it for cleaning, and its easy to do - the trigger is adjust and is pretty good for a factory setup.
If you reload, dont be scared to get a wsm, as they are a great little round despite the bad vibes some give it. I havent met nor read about too many (if any) who complain about them after they shoot them and see what they can do. I know everyone that has shot mine has really really liked it.
Oh yeah - got mine at WSS
Regard
Chrism