As far as I saw there was nothing about ammo other than existing, just need to have a PAL. And, C21 isn't law yet, other than the C71 transfers came into effect on guns.
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You should also be a member;
CCFR
CSSA
The Rimbey show is underway and quite busy, nice to see. Lots of primers and powder etc. and saw one vendor confirm a buyers PAL with the CFO on his cell phone to sell a rifle, no hassle what so ever. Go check it out if you have the time. D.H.