Bren Gun - eight groove barrels ?

IF less grooves = less friction, less fouling.......

..... then WHY did they use 6 grooves at all?

One would think that the LOGICAL thing to do would be to go for TWO-groove Barrels for the Bren, as was done for the Number 4.

Easier to clean, too!
 
Lee Enfield said:
More grooves = more friction = more fouling
Click to expand...

Two groove barrels actually have more friction. Most of the bore dimensions are composed of the minor diameter and only the grooves are at the major diameter.

That is the thinking behind micro groove rifling and the narrow band rifling that Shilen and others use in their match barrels.

The two groove barrel system had been previously proven viable and accurate in Brunswick rifles as well as others.

I had the opportunity to shoot a Brunswick rifle last summer and was surprised at its accuracy. The owner of the rifle told me he never used the ribbed round balls but just the ordinary round ball with a patch. I was skeptical but not knowledgeable enough to make a comment to this obviously knowledgeable fellow. To make a long story short, he was right. The tight patched ball shot to point of aim well past 50 meters with incredible regularity.

The dimensions of the two groove barrels forced the jackets to be obdurated into the grooves which in turn created spin etc.

Friction was greater because more of the minor diameter was in contact with the bullet while it was in the barrel.
 
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