So I get some .45-70 Gov. W-W Super brass all measuring 2.105" max brass length to try with various bullets
in the Browning '86 to see what the maximum COL is that can be shoved through the loading gate
and levered from the magazine into the chamber.
First I slugged the barrel and found a .457" groove diameter.
The throat is just a 12-ish-degree chamfer from case mouth into the rifling,
basically no throat, on a SAAMI .45-70 Gov:

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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.