I had a Ruger M77 Mk II Magnum Express Rifle .416 Rigby without the barrel band. Shot great. MOA or better with 400 Noslers and 410 Woodleighs.
Then I picked up a lighter one with the barrel band and it shoots MOA or better with both of those bullets so let the heavier barreled one go.
No problems with either rifle. They fed and functioned great. I run the 400-410 bullets at 2550 give or take a little depending on weather. I found both rifles shot the 400/410s MOA or better from around 2350 to over 2600.
The only change I made was to put a limbsaver recoil pad on both rifles with 1.5x5 Leupolds.
The current one will stay with me as long as I can shoot it. It's a keeper.
I also had one in 375 h&h with the barrel band. It is a shooter too. A close friend now has that one. He shot it a few times and liked it so much he talked me out of it. Got a nice griz on his first outing with it.

I would like to find a nice one in 30-06 though. :-)