Keys to revolver accuracy with lead bullets were the bullet had to be as large as the chamber mouth of the cylinder and the chamber mouths of the cylinder had to be as large as groove diameter
of the barrel.
Following this deep drilling and reaming, the rifling grooves will be formed, resulting in the groove diameter
essentially the same diameter as the bullet.
277-inch was its groove diameter
and consequently the diameter of its bullets.
Tenders are invited for Repairing of hoist drum groove diameter
Grooves are deemed to be oversize when the groove diameter
exceeds the nominal rope diameter by more than 15% in steel or 20% in polyurethane liners.
I was under the impression that the barrel groove diameter
for these revolvers was right at .
0 caliber diameters, enlarges the entrance diameter to slightly more than groove diameter
, and employs a gentle 1.
Due to what appear to be intentional mismatches between bullet diameter and barrel groove diameter
, accuracy of the Model 1903 is not very exciting.
I size conical bullets to the groove diameter
and spherical balls .
For this reason, the initial intension of wear evaluation by measuring the groove diameter
was changed to gravimetric evaluation.
243 in diameter, same as the rifle's groove diameter
The diameter measured to the outside of the blade determines the limit for the smallest possible diameter which can be machined, and the diameter measured to the inside of the blade determines the limit for the largest possible groove diameter