Interesting - the Ruger Capacity is then virtually identical to my .450/.458 Alaskan. Of course, the .348 case is somewhat stronger.

I am also somewhat miffed as to why David's Ruger won't match the smaller cased Taylor.

Perhaps a different powder would work? It is possible that Re#15 is too fast burning for the Ruger's case, but shouldn't be that much too fast. The larger the capacity for any given bore size, the slower the powder that must be used.

I don't think the difference is whether it's polished or not - my .375/06 IMP has a fairly heavy taper 416 stainless, certainly not polished and rough'ern a cob inside - it copper fouls badly, but - does manage to beat chronographed factory .375H&H ballistics, so it's a 'fast' barrel. It also puts 270gr. TSX's into touching cloverleafs virtually every three shots - at 2,700fps.(2,770fps is max) 80gr., capacity to the top of the neck.

Some barrels are slow - - - some are fast. Then, there's everything in between.