Military Souvenirs

[Platapus]

Originally Posted by Sailor Steve

A 0.51" round wouldn't fit a 0.5" barrel. Perhaps you meant 0.49", or 12.45mm?

Actually it will fit quite nicely. With a little help from the propellent. A .50 cal gun barrel is 12.5 mm between the lands. The distance between the groves is closer to 12.95


As the 12.95 bullet is propelled through the slightly smaller 12.5 Land diameter, the lands cut into the bullet and impart the spin.

That's why a spent bullet has groves. The lands need to be of a slightly smaller diameter then the bullet. Other wise no rifling.