Author Topic: polygonal bores (Read 1423 times)

bob allen · « **on:** March 16, 2005, 02:01:41 PM »

Mr.Smith;
In looking for barrels for some new rifles I'm having built.I've noticed one maker advertising polygonal bores.I can only think that this would swage bullets passing through.Unless a Whitworth style bullet is used.Which got me to thinking if you could cut a mold for a Whitworth bore?I believe people are still shooting this type bullet but have never seen a mold advertised.
Thank You
Bob

jerkface11 · « **Reply #1 on:** March 20, 2005, 02:22:51 AM »

Rifle magazine tested some whitworths about 2 years ago and they shot just as well with round bullets as they did with the bolts.

Veral · « **Reply #2 on:** March 20, 2005, 10:50:20 AM »

Polygon rifling is not deep enough to cause deformation problems with cast. The form in fact works great with lead, and handles bullets gently but with athority, allowing very stout loads with good accuracy.

The only way I know of to make a mold to match the rifling would be to duplicate the barrel in a swage die, which would mean make the sizer from a piece of the barrel. Then each round would have to be oriented to the rifling.

Why hand swage and go to a big hassle when the powder blast will do it effortlessly?

bob allen · « **Reply #3 on:** March 20, 2005, 03:43:27 PM »

Thanks for the replys.
I have seen those pound dies,No thanks.I will try to find that article in Rifle.
Bob

jerkface11 · « **Reply #4 on:** March 21, 2005, 10:35:21 AM »

Bob if you give me a few days i'll try to find out what issue it wasl

bob allen · « **Reply #5 on:** March 21, 2005, 02:38:14 PM »

JF11;
Thanks for the offer,that would be great if you find it.I get Handloader
but not Rifle but I hope to find a copy.I've got a strong mind to try this type of bore,I figure the worst thing is I will have rebarrel,but want to really try and get a feel of what I'm getting into(and the smith doesn't throw me out on my ear)
Thanks Bob

jerkface11 · « **Reply #6 on:** March 22, 2005, 11:20:52 AM »

Well as i recall the round bullets shot as least as well if not better than the hex shaped ones did. And the barrels were a lot more accurate than a normal rifled barrel.