[ctdonath2]

“There is a limit to the tightness of the twist, after which the bullet merely scrapes off into the groves.”

There’s also a limit whereby the centrifugal force is high enough to tear the bullet apart.

[GingisK]

Yep. Gun making is something best done with the cranium engaged. I have just about completed my machine shop. I hope to drill and rifle my own barrels; however, I won't go into high powered stuff until nothing I make bloats under pressure. Retired people have to play, you know.

There are interesting home made rifling machines "out there". I'm not sure which one to build. I will noodle through it eventually.