You need a rifle with a 1 in 9" twist or faster to stabilize aguila SSS.
The toz 17 will do the trick.
I bought a nylon 66 with 1 in 9" twist specifically for SSS.
It worked and the rounds did not keyhole but they did drop like stones as soon as they exited the barrel.
You have to aim at least a foot high at 50 yards when using a semi.
The semiauto rifle also threw chunks of burning powder out the ejection port when cycling.
Bolt rifles work a bit better but muzzle velocity is still only about 800fps.
I recommend you stick to bolt rifles when playing with SSS.
My 10" barrelled ruger MK II pistol would chamber and feed SSS reliably, none of my other pistols would.
It's really not worth buying a firearm specifically for this round in Canada. It is useless for hunting or target shooting.
It is designed for short range use from suppressed firearms, which cannot be purchased in Canada.
Lapua Scoremax has a bullet that is nearly as heavy, faster but still subsonic, quieter, a lot more accurate, shoots much flatter, has full length brass, doesn't shoot sparks and noise out the breach of semiautos, and will not keyhole in firearms with normal twist rates of 1 in 14 or 16.
