Thanks, Al--and RiverRider!

I use both Berger's and JBM's calculators--but prefer JBM's twist-rate when using plastic-tipped bullets, as they have an offset for 'em. As the late Don Miller discovered after he came up with the twist-rate formula most computer formulas are now based on, plastic tips don't count nearly as much in overall length as "metal."

John

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck