.45ACP barrel length?

[Alan in GA]

You made me think of one that already exists,,,the Rem 788 in 44 Rem Mag. It feeds, and is very accurate which means it must have the correct twist at least for the standard weight bullets.
I'm gonna make this interesting and cloudy up the waters even more: I want a .458" bore. I enjoy shooting paper patched bullets in a few rifles I've owned :45/70s, .458 WIn Mag [Ruger 77 Tropical], .458 American [.458 x 2"] in a Ruger 77 short action with a converted Ruger #1 barrel that was a .45/70 barrel [worked great]. I also had a Contender Super 14 in 45 Win Mag. I have envisioned a shortened 45/70 case as a new single shot pistol/carbine [Contender] round that would be the right powder capacity[?] case for a subsonic .458 bore barrel.
There are some "ready to patch and shoot" bullets for any .458" bore cartridge: the Speer 250 gr swaged SWC bullet meant for pistols of .451-.452" caliber. Any lead [soft] pistol bullet meant for the .451" bore ctgs patches GREAT up to about .460" for any of the .458" bore rifles/single shot pistols.
Here's my 'made for picture' 45/70 x 1.5" round I thought might get me into a .458" bore
Contender barrel allowing paper patching--->