Sir Dennis,
Buy a donkey for those flowers.

I will take some new pictures showing the Connecticut Winchester M70 Classics side by side.
1) the .270 WCF converted to 3.6" COL .400 Whelen-B with just a longer box and shortening of the ejector-bolt-stop, and re-barreling.
2) the .416 RemMag converted to 3.6" COL .458 WinMag with just a re-barrel.
Both work, will eject unfired 3.6" COL cartridges.
No cutting or milling on the receiver required.

Same has been done in past with converting a Ruger M77 Mk II to .375 H&H by putting RSM sheetmetal box into it,
and shortening the ejector-bolt-stop. The Ruger gunsmith did that for Dave Scovill,
who sold the rifle to Phil Shoemaker.

Old picture of the .416 RemMag M70 Classic converted to .458 WM+:
It has a 23"-long No.4 sporter McGowen barrel and weighs ~ 8 pounds bare/empty.
If using a 24"-long No. 5 sporter McGowen barrel, ~ 8.5 pounds bare/empty is in the ball park.

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Side-by-side photo comparison of the .270 WCF and .416 RemMag M70 Classic actions
after I get back from a weekend of muzzleloader deer hunting.
Bleep Joe Biden.

Ron aka "Rip" for Riflecrank Internationale Permanente
NRA Life Benefactor and Beneficiary
.458 Winchester Magnum, Magnanimous in Victory
THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.