re: 5.56

well it's good to see cartridge development take advantage of advances in powder.
Bad when experiments involve users' lives.
It's interesting seeing brand-spankin new revolvers with cylinder dimensions determined by a cartridge.. length of which was determined by black powder back in the 1800s!

so stuff like 6.5 Grendel.. it's good to see they're taking into account cartridge/powder advances AND desired end performance.

JYD #5 "If you don't buy one now, you'll just kick yourself later.." -Karnack