just a note here, to point out that the "Genius" who thought those up, and wrote them that way actually ruled out the .243 bullet class rifles, as they are all about 0.236 caliber
Sask regs are the same.... Firearm or projectile of .23 caliber or less...
so, a rifle with a bore diameter of 0.229 would not be legal
bore would have to be 0.231, and that would put the groove around.... 0.237
like I said... genius!
.6mm (.243's) are legal in Yukon for everything except Bison.
What you are quoting are regs "summaries" and sheep "summaries", which are not legal documents (the "real" legal Act and Regulations are clear that 6mm/.243 is legal). Whoever wrote in your "Sheep Hunting.." summary that you need to use "larger than 24 cal" is just plain WRONG, and being an idiot. A sixth grader reading the real regs could tell you this. The regs you quoted below "illegal to use less than .243..." is actually legally correct.
Smaller than 6mm/.243, not legal; 6mm/.243
is legal.
Up here, for some idiotic reason, the people who do up the summaries each year always take liberties with the language of the regs and write them up just a little different every year, often leading to screwed up information, none of which is legal anyways.
I've seen it lots in Bison regs, where legally there is no energy requirements for black powder, but a few years, the morons doing the "summaries" just added this in, despite it not being in the legal regs, and not being accurate. A few people, like me, complained, and they removed this arbitrarily added in energy requirement for black powder for bison in the summaries.
They did the same thing with centerfires too, for a couple of years. The law is .30 cal, 180 grain bullet, 2800 ft/lbs at the muzzle. Some idiot doing the regs summaries that year suddenly decided to put in that "30-06 with 180 grain bullet is the minimum.", and suddenly some hunters using hot loaded 308's (totally legal) were getting hassled because the idiot doing the regs summaries just decided on his own to add the "30-06" thing to the summaries. Again, after some complaints, the "30-06" thing was pulled from the regs summaries as it was BS.
They'll probably screw it up again at a later date...