Totally unecessary on the 375.

Winchesters system of welding them on does not hep the barrel.

I have aso previously owned 3 push feed M70 458s and shot them with the lug free floating.

For accuracy they are at the best if a scew is inserted into the lug, the action bedded and the barrel free floated either side of the lug.

If the barrel is free floated and the lug is bedded it can move up and down and not properly relocate. The factory overcomes this by the pressure bedding on the forend tip.

It is worth noting that the old Sakos with their tiny Mauser style recioil lug did not use a barrel lug although the action rested directly on the cross bolt so as to effectively increase the size of the tiny action lug.

H&H (unless they have changed) do not use a barrel lug on the 375 and they have the little piss poor Mauser recoil lug.

The very best system is to have the action recoil lug narrowed and a strap with a slot that is epoxied into the forearm and the action recoil lug is bedded into the steel strap.

The other good system is what Weatherby uses where the barrel lug is mounted on the barrel reinforce about an inch in front of the action.

The cross bolts on the M70 are designed to stop the stock from splitting when the magazine section of the stock "balloons" out under recoil. Lots of rifles have them but they are hidden, that is, the bolt does not extend outside the stock. Weatherbys use that system.

Remington does not use a barrel lug on any of their big bangers but of course they have a big action recoil lug and the most stock material behind the recoil lug of any rifle out there.
Mike