Most powerful .22 round?

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Neither of those is the most powerful .22 round. You have the .223 and the 22-250 in that category also and I am not sure what all else there is but I know there are many more powerful than the .22 Hornet or LR.
 
There are literally dozens of .22 Centerfire cartridges. A quick look through the Hodgdon manual finds (in order of increasing power):

.22 Hornet
.218 Bee
.222 Remington
.223 Remington
.222 Remington Magnum
.22 PPC
.22 BR Remington
.224 Weatherby Magnum
.219 Wasp
.225 Winchester
.22-250 Remington
.220 Swift
.220 Jaybird
.22 Chetah Mark II

This of course doesn't include many older cartridges (like the .22 Imp), or obscure wildcats -- nor does it include the new .22s developed on ultra-short-and-fat cases.

The .22 Winchester Magnum Rimfire is the most powerful .22 rimfire, no doubt about it.
 
Vern pretty much summed it up, however I felt there was one thing I could add. I am a huge fan of the .22LR and I stumbled into what I consider to be one of the finest loads for it ever. It's called the Sniper Subsonic and it's made by Aguila. The bullet is nearly twice the weight of a standard .22LR and the brass is quite short. What this round does and does well is retain energy. When I hit my spinner target with one of these. It jumps like it was hit with a .22 Mag! It's quieter and cheaper than the .22 Mag plus it works in all .22LR actions. It shoots through my Buckmark like the two were designed for each other.
 
They do use the .22 short case. Icompared a spent cartridge with a box of .22 short one day; identical lengths.
 
Stop giving this guy a hard time. I think he meant

"most powerful 22 LR ammo" .....I'd be interested in knowing this also.

Only problem with the Agular SSS ammo is it requires a different twist barrel than what you have in say your standard Ruger 10/22.

Use it in a 22 conversion kit in your AR-15 and it's pretty cool :evil:
 
I just went out back and fired a Dynamit Nobel Subsonic .22 into the wood pile. The case measures .602 inches. The case appears to be the same length as a Federal .22 Long Rifle High Velocity case. ;)

A Super X .22 Short case I have sitting here on my table only measures .400 inches.
 
Oh, sorry guys. I thought you were talking about the case length of any old .22 Subsonic. The Sniper Subsonic by Aguila case could very well be the same as a .22 Short. I've never seen them, but I hope to find some this weekend and give them a try. :eek:
 
Kenshin;

Yeah, would you please be a bit more specific? The question, as asked, is too broad to give a single accurate answer.

900F
 
King of the .22? 22-243 Middlestead. Over 5,000 fps. One can drive a 69 gr bullet at 3,600 fps.
 
I'v got some .22LR Stingers that I use for live targets (ground hogs). They do pack a good bit more punch than the run of the mill .22LR. How much more I could not say.
 
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