To put that in ft-lb like a normal American (with a few common handgun rounds for comparison):

• .22 LR: 200 ft-lb
• 9mm Luger: 400 ft-lb (also: uzi)
• .45 ACP: 500 ft-lb (also: tommy gun)
• .357 mag: 700 ft-lb
• .44 mag: 1,000 ft-lb
• .223 rem: 1,400 ft-lb
• .30-30 win: 1,900 ft-lb
• .308: 2,600 ft-lb
• .30-06: 2,900 ft-lb
• .45-70 Gov't: ~3,000 ft-lb (very large variance)
• 7mm rem mag: 3,100 ft-lb
• .300 win mag: 3,700 ft-lb
• .338 Lupua: 4,900 ft-lb
• .50 BMG: 18,000 ft-lb

Where do you draw the "high-power" line? Personally i would say .223 and .308 are normal power because they are the standard operating rounds of infantry around the world. Anything bigger than .308 is high power. That's very subjective though, and i'm also not aware of any actual legal definition.

So you're saying OP miscategorized the rifle he was trying to talk about.

Paddock bought a Ruger American in .308, which wouldn't be a "high-powered rifle" at all.