Many many Canadians, especially those of the "baby boomer" generation, (and their fathers) spent at least the early years of their hunting using "sportered" versions of the 303 Lee Enfield. I remember seeing the surplus rifles priced at $15-$25 Canadian and displayed stacked in barrels at some of the local stores. The "sporterizing" work ranged from crude DIY Bubba jobs, through factory conversions such as Parker Hale, and even to carefully crafted gunsmith conversions. My dad had one of the latter. I know there are still lots of 303's that see plenty of field time here every hunting season. A hunting companion just recently gave up his deer, bear, and moose killing 303 Brit. in favor of a new .270W. I did one up a few years ago ... new ATI camo stock, barrel cut and recrowned at 22", and carrying new Bushnell glass, to give to my son-in-law. I have kept a Paker Hale conversion which is in wonderful condition, and which sees some service at the range, but spends the bulk of its time as a "safe queen". Mostly I use my own 174 gr Hornady reloads in it, but I do have a full box and a half of the old 215 gr Kling Kore SPs ... just in case I really need them one day!
The only knocks on the 303 as a sporting cartridge is the unfortunate reality that some of the war time rifles produced to handle it were not manufactured to the strictest of tolerances, and reloaders need to take special care ( necksizing) or case life can be fairly limited. All in all, I consider it to be a very capable and classic cartridge.