Despite what Milanczar says, some people do watch this show, it's one of the few things CBC has ever put out that I enjoyed. In fact I watched it all the time as a kid, crazy to think it's been on the air for 12 years now
Do you remember the sniper episode from early on? I just went back and re-watched it and it seems like something made purely by the imagination of the prop department but still looks like a pretty cool design
In the episode they say it's ".60 caliber, 1:10 twist shooting a lead-core, copper-iron jacket pointed bullet easily to 500 yards"
Amusingly enough everyone claims these shots to be impossible despite in the real world about 30 years before, Confederate snipers were taking confirmed kills at 1000 yards (probably most famously the Union General John Sedgwick)
Here are some screenshots I just took from the episode: