I think it's pre-1898 muzzle loaders that qualify as antiques. I think if it uses cartridges it is then a restricted firearm.
nope. here is how they define antique, from w ww.eohc.ca/antiquegun.html
HANDGUNS
6. A handgun manufactured before 1898 that is capable of discharging only rim-fire cartridges, other than 22 Calibre Short, 22 Calibre Long or 22 Calibre Long Rifle cartridges.
7. A handgun manufactured before 1898 that is capable of discharging centre-fire cartridges, other than a handgun designed or adapted to discharge 32 Short Colt, 32 Long Colt, 32 Smith and Wesson, 32 Smith and Wesson Long, 32-20 Winchester, 38 Smith and Wesson, 38 Short Colt, 38 Long Colt, 38-40 Winchester, 44-40 Winchester, or 45 Colt cartridges.
8. A handgun manufactured before 1898 that is a muzzle loader.
so cartridge guns are ok as long as they fire things like the 8mm french, .455, 41 colt, etc. basically anything except the common american cartridges.
my wet dream is that "manufactured" be interpreted as "designed".