You should consider yourself very lucky to have a matching number magazine. That was common with the first batch of these rifles years ago that had original military receivers, but it's extremely rare with subsequent batches of them. The original Romanian milspec receivers had a third axis pin and the ATF declared them illegal, so the ones we have now are rebuilt guns on commercial receivers, and the original mags get lost in the transition.
I'd avoid the heavy loads. Not what the rifle is designed for, there is a lot of info available on this.
Being an AK variant, the PSL will often put a nice dent in the side of each case as it ejects, so handloading can be a bit of a hassle. Mine does about 1.5 MOA with commercial steel case 148 grain, 2-3 MOA with surplus light ball. With any load, groups will open up if you get the barrel too hot.
The Red Star trigger is a very worthwhile addition to these guns.
These aren't what most Americans consider precision rifles. What they are is a simple, solid, accurate semi-auto that essentially has double the effective range of a regular AK. They are a lot of fun to own and shoot, and you'll get lots of curious comments and stares at the range.