Most powerful?

I've seen a few springers and gas piston models in the US that advertise speeds of 1,200 fps and higher. I assume that PCP airguns shoot even faster.

And yes you can buy such airguns here in Canada providing you have a PAL.
 
There are a number of "powerful" large bore air gun manufactureres. Quite a few are made 'off shore', but there a several US builders.

Dennis Quackenbush is a well known US builder. Jack Haley (RIP) is another US builder who made some powerful PCP airguns over the years, right up to .58 cal.

I own one of Jack Haley's .45 PCP air rifles.

I've shot 300 gr up to 505 gr "pellets" out of it! I now use a 330 gr hollow point "pellet". With a full charge of air, it will deliver approx. 400 FPE.
For an air rifle, it is a BEAST!

I've shot it out to 100 and 200 yards at the range I belong to with pretty good accuracy.

Here are some photos of Jack's builds:

http://www.southernairgunconversion.com/southern_airguns_015.htm

Here is a good video comparing the energy delivered by a Haley .45 to a .25 Theoben at 130 yards:

http://www.youtube.com/watch?v=3PP6NNST_7o
 
If "powerful" is your only shopping point for an air rifle, you are better off shopping for a .22 rimfire.

The rimfire will be cheaper to buy, cheaper to shoot, and will not require expensive support equipment to keep it operating (scuba tanks, or a high pressure hand pump, or both).

If you are after an air gun because you think it will get around not having a firearms license, you need a firearms license to buy anything with over a 500 fps velocity rating. And you are only legal to shoot it, where you are legal to shoot a rimfire.

Well made, powerful airguns, are expensive as heck.

Best to figure out, and state, WHY you want a "powerful" airgun, that you can be sent in the general direction that best fits.

My vote for the most powerful airgun goes to the air powered guns that were used to launch dynamite bombs off the boats during the invasion of Cuba when the Rough Riders went ashore.

Cheers
Trev
 
Generally this question pertains to who makes the most powerful 17, 22, 25. A good one to buy is the Trail. It gets good reviews, is good enough. And it has a lot of aftermarket somewhat like the 870, 700, 10/22, or 1911.

However, if you are asking who makes the most powerful conventional gun, then you might want to rethink your approach. Springers, and even PCPs are rarely simultaneously the best, and the most powerful. One reason is they know they will catch the punters after their first gun by making a cheap gun with a big, usually fraudulent number. Many of these guns are OK, many others are unusable, but putting a pellet on target with effect is actually a pretty complex series of compromises. You have ease of charging, trigger, recoil, velocity, accuracy, noise, cost, vibration, scope breaking, etc...

Overall shootability is the main issue. In the UK it works out nicely, because most quarry is small as with the pigeons and rabbits (a small creature in the UK). Here and in the US, there are much tougher target: Jacks, groundhog, hog, raccoons, etc... So one does often need a fair amount of power. But if you run to smaller animals, or targets, then scaling back on power only is a good idea.
 
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