Polygonal Rifling for a Rifle Barrel?

How good or bad is polygontal rifling for a rifle barrel?

What are your thoughts and experience with the polygontal for a rifle barrel?

Thanks

Well, the original Whitworth was a polygonal rifled barrel. Confederate snipers seemed to do well with it.

I had a 22/250 with Walther 6.5" twist polygonal barrel. The idea I had was that it should provide longer strings of accurate fire over conventional rifling due to fouling.
I was shooting 90gn Bergers and it was very accurate. I could never afford to proove it but I believe it helped.

anything that deforms the jaxket,or the bullets shape less should shoot better. [i definatly think it helps terminal performance on game]
at least that was marlins claim to fame with the microgroove bbl.
it seems to me you'd have some gas blow by,and lower velocity's from the hexagonal bbl though.

Excellent question. I'm shopping ideas for a new build and had the same question: What about polygonal rifling for CAST BOOLITS? Wouldn't that reduce shear stress on the land engraves and actually increase torsional bearing surface? Splines are strong, but only if you have a whole bunch of them.

Gear

The Springfield O3A3 2 groove barrels seem to do very well with cast. They must be deforming the boolit quite a bit.

I am not looking for lower velocities. Looking in the range of 2000 fps in .30 caliber.

i really wonder how a 8, 12 or 16 sided bbl would do.
something different anyway.
you might just oversome stripping issues by not having lands.

I was thinking seven sides, or nine.

Also thinking of high velocity, much higher than 2,000 FPS, and a twist no slower than 12".

Gear

this would sure change the way boolits were shaped.
eliminate small drive bands,
truncated cone noses.

i wonder how a p/p would work...