Most efficient .22 center fire

I'd never even considered the .221 fireball but it looks like a very efficient cartridge. Doesn't get a lot of press.
I'm gearing up to build a .221 because I can. I built a 17 Fireball and it's incredible on pasture poodles in MT. FPS per grain of powder is very efficient. Not a huge difference between .221 FB and 222. I shoot a custom 222 in MT also, spitting Speer TNT 50 at .13 - .15 cents per bullet and extremely accurate.
 

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The most favorable, general answer will be the .223 Remington or the 5.56mm version. Overall availability and cost plus reasonable performance rule the day. This can include, as noted above, several variations on a theme. I shoot one, sure but it isn't a favorite.

Currently, for overall performance, I am running the 22 GT and using the Alpha Munitions brass. No it's not cheap but the brass is excellent in quality and consistency with case life being longer using the cooler burning powders (slightly slower velocities) and no long volleys. My barrels are made with fast twist so I run the heavier target bullets.

:)
 
As a kid I shot a 26 inch 22-250. I got over my days of barrel burner bragging rights shooting long ago and I got into practicality and common sense. :) I got into match grade ar15's. I don't have any experience with a 223AI. because my research showed that the case only gained about 2 grains of powder. I'm not sure that right in the burn rate chart if there is powder to take advantage of this minor volume change. I generally load with CFE223 and power pro 2000 -mr. Right up at 5.56 pressures around 60,000 psi using rifle and rifle +2 inch gas tube holes on piston guns

In 2022 I bought a 224 Valkyrie because the 223 IMO is limited to 75 grain bullets. Because the neck is too short and the magazine length limits you on COL. Also 223 Rem heavies become horribly slow out of even out of 20 and 24 inch barrels. I actually only use 62 and 69 grain because I perfected them over time in my 223 stuff. RMR sells .223 69 hpBT for about 14 cents each these days for 1000.

Cheap fun shooting like my Wyoming PD shooting where I go through 300 rounds per day I use cheap bulk bullets 55 or 62gr hpbt out of a 223. But I always bring along my trusty 224 valkyrie 24 inch AR loaded with 75 gr match bullets



 
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Define long range, compared to a 22LR the 22 hornet is a long range round, 12 grs of a number of different powders will give you 3000 to 3200 fps with 34 to 40 gr bullets, compared to a 220 swift which can burn 40 or more grs per pop, in practical terms a 223 makes a lot of sense,
Are those chronographed verified loads out of a say 22 inch barrel? My buddy chronos his and he was beyond skeptical. Quote he said maybe with 30 grain and no typical 22 hornet bolt rifle was ever built for over 50,000 psi loads.

Just another opinion about rounds that were only somewhat better than 22 mag rimfires of yesteryear. They just don't have the jam or the twist rate in those rifles sold years ago to be a longer range choice like my 14:1 twist 22-250
 
Are those chronographed verified loads out of a say 22 inch barrel? My buddy chronos his and he was beyond skeptical. Quote he said maybe with 30 grain and no typical 22 hornet bolt rifle was ever built for over 50,000 psi loads.

Just another opinion about rounds that were only somewhat better than 22 mag rimfires of yesteryear. They just don't have the jam or the twist rate in those rifles sold years ago to be a longer range choice like my 14:1 twist 22-250
Yes they are verified using H110 for 34gr dogtown hollow points, and lilgun for the the 40gr Speer sp, loads are from the Hornady Manuel, rifle is a CZ, barrel was shortened from 23.5 to 21.5
 
22br variant if you want heavies above 3000fps. 22gt if you want em up to 3200 fps, going faster you have prob X47, creed and the list goes on.
 
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