Re: 300wsm Can?
I have a 300WM I run with both a 30P-1 and a YHM Phantom 7.62, both thread-on. The YHM is a good can at a low price, but mine is heavy as balls. The Thunderbeast is superior in almost every possible way, not least of which is being about half the weight of the YH can.
I see more POI shift with the YHM than I do with the 30P-1, but POI shift is consistent with both. I cannot say either is quieter (never have metered either) but the sound of the 30P-1 is, to me at least, preferable. (Though I'll be the first to admit it might be a bias based on paying 2X for the 30P-1 than I did for the YHM can.)
Both cans take allot out of the recoil and noise, making a relatively light weight 300WM pleasant to shoot.