Working with rsterne (Bob’s Boat tails) on some Air rifle moulds We have come up with the following design 14″ Twist Post if you have any interest and will see what we can do.
My special thanks to Al Nelson for expediting the tooling and production of these moulds, so that those wishing to use them at the EBR this fall will have lots of time to cast, experiment, and finalize their tuning….
While the Kolbe Twist Calculator I used says that the optimum for this bullet for airgun use is a 14″ twist…. there are reports of it being accurate in a 17″ twist at 800-900 fps….