Note:  Do not rely on this information. It is very old.

Lancaster Gun

Lancaster Gun, an obsolete heavy gun, the peculiarity of which consisted in the fact that the twist to the projectile was given, not by rifling, but by making the bore of the gun of oval instead of circular section.

“Let us not give up meeting together, as some are in the habit of doing, but let us encourage one another – and all the more as you see the Day approaching.”
Hebrews 10:25