Originally Posted by Riflecrank
Sir MedRiver,
I would not be surprised if you had a variant, short chamber, maybe even as short as a .458 Lott.
You need to put an inverted, flat-based bullet with a long shank in a 2.500" case and see how long you can stick it.
SAAMI slug jump is 0.6725" from a 2.500" case mouth with a 0.458" diameter of right cylinder slug.
Also slug for groove diameter and check twist of the barrel.
If all is SAAMI, you have a great barrel.


I am coming up with just shy of a 1:18" Twist, .458" groove and an inverted flat base extends from a 2.495" case about .395".

[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]

Looking like maybe a touch short