Fast twists have been around for a very long time and there's nothing new under the Sun. And of course the 6mm Lee Navy had a fast twist and some of the Ackley 22's needed solid copper bullets, no Barnes didn't invent them.
The back reads:
"This is my old 30-06 Winchester made into a 6MM with a 22" barrel and a new stock etc. It has an 8" twist barrel and uses 110gr + 120gr bullets instead of 90gr which KG's gun uses.".

The back reads:
"This is my old 30-06 Winchester made into a 6MM with a 22" barrel and a new stock etc. It has an 8" twist barrel and uses 110gr + 120gr bullets instead of 90gr which KG's gun uses.".
