Ha HA we have a self appointed expert and joker in JVS.
Before you go throwing you total ingonarance about I suggest you go and learn at least something about guns and air guns in particular. You might try and start by researching the Lewis/Clarke expedition who used a pre charged air gun for hunting. Then you might like to search about Napoloens' view of the Swiss Military sharpshooters with Oh gee wow pre charged airguns

There is no such thing as a silencer as the discharge of a fire arm cannot be silenced only Moderated

and they ain't illegal here in the Good Ole UK as you see from the Photo

heck I am even considering one for deer stalking, deciding which rifle to put it on is the problem though

I suppose if I didn't have so many to choose from it might be easier

Moderaters are actually suggested use under Health and safety issues and our Forestry Commision which is responsible for Deer control in the commercial woodlands issues them to it's rangers after a couple of incidents of hearing damage.
3. Animal Cruelty is something I dont concern myself with. Dead is dead. Whether it is a Baby Rabbit or a Deer. I prefer to get it over with quicker and with more power.
Oh boy a
REAL HUNTER 
the poster was refering to .22 rimfire were so low powered that were only good for shooting at wayward cats. Unless the cat is a feral cat and being a nusience you are shooting to injure some ones pet and in most states I think you will find is actually illegal. But you don't care about animal cruelty ............... hmm no wonder there is so much to show on Animal Planet with the Animal Cops

4. And nothing any Brit can tell me about guns is anything I want to know, nor do I care to know that side of the story. They don't usually have enough experience with those nasty old guns to prove a point. Tell us whether you can buy high velocity and hyper velocity .22 shells in Merry Ole England, or how about high powered rifles and ammo, and if not, why.
Have a good day, old chap. This conversation is over as far as I'm concerned.
Note that as soon as they lose they run!
How would I have found out about the inaccuracy of Hyper-Velocity ammo without trying them out? I chose Winchester Lazer and it was expensive compared with the std velocity stuff sounded impressive but was inaccurate to say the least. I suppose it could be used at 25 yards at a pinch but what's the point of that? My current stock of the Winchester Sub-Sonic is getting low as I am down to about 300 rds, the std velocity Swartclip I have around 800 left of so enough for now

Hmmm I wonder what jvs considers High Powered rifles and ammo?
Gee I suppose that none of these would count :-
Baikal MH18 .222 Rem
Parker-Hale 1200V 6mm Rem
Obendorf Mauser M96 6.5x55
Gustav 96 mauser 6.5x55
BSA Majestic Feather Weight Deluxe .270 win
BSA Monarch 1st pat .270 Win x2
BSA CF2 stutzen .270 Win
BSA CF2 7x57
Rigby Mannlicher mdl 1892 6.5x53R
Steyr Mannlicher schoenauer model 1903 6.5x54
Brno model 601 .308 Win
DWM Mauser M93 special sporting rifle 7x57 Mauser
P-H 1100 Deluxe 30-06
P-H 1200 Super 7.92mm (8x57mm)
BSA model D .303
BSA Model E .303
BSA Model No1 .303
Husqvarna model 46 9.3x57
But I doubt any of those would be considered "high powered as they don't have the magic word
Magnum so :-
Parker-Hale 1100M .458Win Mag

No jvs I don't have any high powered rifles nor ammo at my disposal the ones listed are all figments of my immagination

and I never shoot them nor hunt with them:-

With a nice Muntjac Doe

BSA CF2 with Whitetail Doe Northern Missouri

With 9 point Buck again in Northern Missouri

Pair of Muntjac deer

Muntjac Doe with a Bespoke (custom) rifle which was built in 1999.
Hmm just when it was getting interesting too ........... Sigh