And while its length places the bullet of a chambered cartridge closer to the rifling
than in a sporting chamber, it is not engaged by the rifling
as in a match chamber.
CAPACITY 10+1, Al-style magazines BARREL 26 in., 10:1 twist, 5R rifling
OVERALL LENGTH 47.5 in.
cutter box had to be rotated as it was drawn through the barrel's bore in order to cause the grooves to spiral around the circumference.
If you look across the muzzle in a good light, you can see the ends of the rifling
lands (the raised portion).
(Paradox by Holland), oval boring (Lancaster), and invisible rifling
are three of the most common of these uncommon inventions.
For lack of a better term, shadows of the rifling
were seen in the reflected light.
About this time William Greener used narrow-land rifling
pitched 1:30 to stabilize bullets out to 2,000 yards.
The rifle has seen heavy use even to the point that its rifling
grooves are dark.
The bore-scope showed the fine-cut rifling
that pre-'64s are known for, with traces of very light pitting.
In their six grooves, Colerain barrels feature round bottom rifling
that holds less fowling; square bottomed grooves reportedly retain more fowling.
HERE IS A BRIEF LOOK AT RIFLING
MET HODS, BOTH SPACE-AGE AND CENTURIES OLD.
A tightly patched cleaning jag rotates the ramrod almost a half turn as the patch follows the rifling
the length of the barrel, indicating a rate of twist, around one turn in 66 inches.