Hornady Superformance Varmint
Hornady has expanded their Superformance line to include .222 Rem, .223 Rem, .22-250 Rem and .243 Rem. They specifically state that the rounds work fine in semi-automatics.
Speed Kills! Varmint hunters can now reap the benefits of Hornady® Superformance™ propellant technology in their favorite varmint cartridges.Superformance™ Varmint ammunition delivers muzzle velocity increases of 100 to 200 feet per second from EVERY gun. Accuracy, increased range, flatter trajectory, less wind drift and devastating terminal results are all realized with Superformance™ Varmint ammunition. Featuring the industry leading polymer tipped Hornady® V-MAX™ bullet that delivers match accuracy and rapid fragmentation, Superformance™ Varmint ammunition from Hornady® extends current varmint cartridge efficiency and performance. Optimal results are achieved in all firearms, and Superformance™ Varmint ammunition is safe to use in all action types, including semi-autos.
It will be available in 2011.

By God that was awful…and anticlimactic too.
I’ve chronographed the Superformance 150 SST lead-core in my DPMS 308T and they averaged 2,800 fps from the 16” barrel for 5 rounds. I fired a couple of 3 shot groups @ 100 yds and both were 3/4”. If I remember it was about 60 degrees, the same cartridge in my buddies DPMS 308b 18″ barrel averaged 2,855 fps with slightly smaller groups. The groups were the same as “regular” powder loads but the velocity from my 16” autoloader with a 150 grain bullet was astounding to me. 2,800 fps is the avg I get from my 125 grain Nosler/TAC reloads, I could put in more powder but then my groups open up to about 1.5”…not acceptable.
Check out this .45
Check out this video on YouTube:
http://www.youtube.com/watch?v=fUJ4bL6O3uw&feature=youtube_gdata_player
Do they make a 62 gr .22cal bullet?