It was my understanding that if you were in the bush when there was an open season.....use deer for this example....and you were carrying a firearm of a caliber that could be used to hunt deer...and you didn't have a license....then you could be considered to be hunting/poaching. If there was no open season, and you were carrying say a 30-30, and a bunch of targets...then you were ok. If I'm not correct here, when did this change????
How are you supposed to ever target practice if there isn't a range around ???? Go buy a deer license and only go out plinking when season opens??? I think you're taking the "your hunting no matter what" idea past what the laws actually are.
+1
Remember, most LE are just trying to make sure that everyone and everything is o.k. As long as it is not open season for big game and you have paper targets with you, and are shooting on crown land with all reasonable precautions (Backstop, not near homes etc...) then you aren't doing anything illegal.
In the event that someone does come by, be polite, answer his/her question and show your papers. (PAL and Reg) There should not be any problems. I have done this many times in Crown land just north of North Bay. No one even bothers. I've even heard other plinkers in the distance at other gravel pits in the distance.
We need to remember that there is the law (minimum standard of compliance). If you break it, they've gotcha. Then there is best practice. So all this talk of black rifles and LE comming up with GUNS drawn is anti LE histeria.
When LE aproaches you on Crown land in your favourite shooting pit, just secure the weapon (unload and make safe) then place it on the ground or in a case right away. While this is not a legal minimum. It is polite, common sense to help LE understand that you are not a threat.
If your VZ-58 is non-restricted, then when you show you registration proving by serial number that it is , weather it looks mean or not the LE hasn't got a leg to stand on if he tried to do anything to you. If he tries to take you to court, represent yourself and laugh at him when the verdict "Not guilty" is read. You could even get representation and counter sue for illegal seizure, detainment or whatever else someone might hypothetically try. Then again laugh in his/her face when the LE officer has to eat his hat for being a doorknob that doesn't know how to do his job. However, I would like to stress, that this nothing like this has happened to me or anyone I know personally. In the rare times that we have come upon LE, the worst they have ever done is inspected our paperwork to make sure everything is on the up and up. (As is their job)
I can't speak about the ten round mag. I was under the assumption that semi-centre fire was 5 only, hunting or not. That is why high cap mags are allowed, but only if they are pinned to 5. I assume this applies. In the case of a pistol mag and round fitting into a rifle, the rules say semi-auto centre fire is pinned to five. So as I understand the law, you cannot use a 10 rnd mag in any crown land plinking unless it is rimfire.
5 for semiauto-centrefire- anywhere.
Shotgun - 3 for hunting in Ontario, 5 for semi-auto non-hunting and unlimited for non-semi-auto. Ex If pump, then no limit. You can have a mile long magazine tube if you wanted.

10 for handgun - range only