Home Forums Hunting & Shooting Express Rifles and Big Bores Only The great 458 Winchester. Everyone should own one at least once

A cast bullet meant for the .461 Gibbs muzzleloader made the transition to smokeless cartridge, in the .458 WinMag.





That was an actual bullet diameter for grease-lubed,
and the muzzleloader bore diameter was .461" also.
Paper-patched slicks would be patched up to .461" diameter also.
The smack of BP obturated the rear third of the bullet into the grooves,
and the front two thirds of the bullet became a bore rider.
The same system was used in the .461 Gibbs BPCR
where bore was .461" and groove was about .471".

Much simpler in the .458 WinMag where a .461" bullet is simply squeezed down by the more gradual burn of smokeless.
.461" bullet goes into .458"-.459" groove diameter and .450"-.451" bore diameter.







Can be fine-tuned to your rifle.