I hunted mostly in Saskatchewan. Must have met Ganderite in a previous life, because I bought a Win 70 XTR in 308 and a Leupold 2-7x33 in about 1978 and shot many truckloads of whitetail, mule deer and two elk with it using 165 grain Speer HotCor @ 2,800 fps. My son has it now. My wife shot her mule deer (close to 200 pound carcass) with 243 Win 85 grain Speer broadside through and through chest. So, OP with .223 and .243 is set up nicely for up to live weight, say, 250-300 pound game with quality bullets. Next reasonable step up, IMO, would be 308/30-06. I last used my 338 Win Mag for elk in North East Saskatchewan. Next time, will probably be my 9.3x62. Would use either of them or my 30-06 for moose. As for experiencing the "kick like a bastard" that OP is looking for, I found my 5 pound 3" 12 gauge single shot, a 7 pound 45-70 double, and an 8 pound 458 Win Mag - no recoil pads on any - get my attention for sure, but not certain what I would hunt with them on purpose. Not really bothered much by big dangerous game here in the Prairies.