Hornady still lists velocity of its 123 grain SST and ELD-M from a 24" barrel. What are typical velocities out of 16" ones, and does any one particular barrel type consistently seem to be a little faster or slower (probably due to rifling style/profile vs. friction).
The SAAMI spec suggests 6 grooves, each 0.090" wide, but it would make sense that certain bullets might prefer other rifling styles and footprints (5R, sharp-edged single-point cut vs, slightly rounder button or hammer-forged, etc). I remember that early on, Bill Alexander mentioned that some bullets (bi-metal, IIRC) did better with "steep, European-style rifling", although he may have been talking about accuracy only.
Thanks
edited to add: Sorry about the mistake on the title: 123's, not 123"s.
The SAAMI spec suggests 6 grooves, each 0.090" wide, but it would make sense that certain bullets might prefer other rifling styles and footprints (5R, sharp-edged single-point cut vs, slightly rounder button or hammer-forged, etc). I remember that early on, Bill Alexander mentioned that some bullets (bi-metal, IIRC) did better with "steep, European-style rifling", although he may have been talking about accuracy only.
Thanks
edited to add: Sorry about the mistake on the title: 123's, not 123"s.