416 Rigby loads with Northfork CUP points, how hot is hot enough?

[Rule 303]

BC Tal thank you for that. Just from what Mooze was saying it appeared that a bullet was required to expand to a set percentage of it's size, this is what threw me.

 

[spike.t]

How hot is hot enough....mmm....can't understand people who want to hot rod the rigby...stick with original velocity...it has worked for a long time.....I never had any complaints....and still pleasant to shoot....but do whatever you want....

 

[mooze]

You didn't mention solids you did mention the expansion size of the CUP and to check to see if a 1.2 times expansion was legal in Canadian Provence's. Like I asked where else other than Canada has a minimum expansion requirement. Until I read your post, I didn't know that an expansion size be it 1.2 or greater was a requirement in Canada. While we are on it how much expansion of a bullet is required in Canada?

Thanks BC-tal for the above explanation, nothing to disagree.
the original is here:

Hunting Regulation

there is no number, the 1.2 was my estimate for CUP point form change from pictures and the few I retrieved from the range sandbox (.366 286gr Cup points). I did not take pictures, idiot me.
I think factually the argument that it is NOT an expanding bullet will be difficult to make, as opposed to the Woodleigh hydrostatics the rim of the cup is so thin it is clearly made for deformation. But it certainly does not reach the 1.5x expansion of a Barnes.