Hexagonal bore

brybenn

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I understand the concept of the whitworth muzzle loaders but i saw an add for a rolling block 50/70 with a hexagonal bore. Would you use hex shaped bullets and align them with the bore? Or am i missing something? How does it work with a brass cased breech loader?
 
Without doing any measurements of the throat and bore it's hard to be certain but I'm thinking that slightly oversized round bullets would work just fine. Can't imagine anyone would make a military or general purpose rifle where you have to carefully align the cartridges. Could be the intention with a specialized target gun though. Something similar to Pope loading.

The hexagonal shape is used in Glock pistol barrels and those aren't too picky.
 
Without doing any measurements of the throat and bore it's hard to be certain but I'm thinking that slightly oversized round bullets would work just fine. Can't imagine anyone would make a military or general purpose rifle where you have to carefully align the cartridges. Could be the intention with a specialized target gun though. Something similar to Pope loading.

The hexagonal shape is used in Glock pistol barrels and those aren't too picky.

Bullets were hex shaped
 
Whitworth bullets were hexagonal. I've heard they can shoot well with round bullets too.

I've never seen a cartridge with polygonal bullets. (Hexagonal chambers and dies?)
They don't make special ammo for Glocks.
 
Glocks rifling is polygonal not the bore. The whitworth was an actual hexagon bore and had hexagon bullets but they wete loaded from the muzzle

Maybe the add misinterpreted it and it has hexagonal rifling not an actual hexagon bore?
 
Taking a closer look like I should have done in the first place, I see the distinction. To call the Glock polygonal is misleading as it's more of a radiused rifling than true polygonal with sharp corners.

I have seen an old barrel that looked from the muzzle like a true hexagon. It was an old Swedish rolling block and I might even have it in a spare parts stash. Many things like that were lost settling the estate but I will take a look for it later.
My father shot it with modified 50-70 cases as it was still in the metric 12.7x44 using round bullets. Can't say how successful that was though as it was soon replaced. Problems were more likely the availability of brass and the condition of the barrel.
https://castbulletassoc.org/blog/article/2017/5/73/resurrecting-a-veteran-swedish-rolling-block

https://forums.gunboards.com/showth...5-Artillery-Carbine-(unissued)#/topics/208790
 
the 50 -70 is probably one of the Danish one from tradex that was rechambered
A friend has one and slugged he barrel with a cast .510 bullet and when it exited the muzzle it is hex shaped ,.
He just loads the 510 bullets into his cases and shoots them like that
 
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