ciao,
Well, I'll agree with the variable choice. The decision would mainly hinge on what you would be doing with the gun overall. Most of my variables are 2X7's, or 2X8's.
Years ago, after a chat with the fella's at SSK Handcannons, their recommendation, at that time, was (believe it or not), a Simmons 2X8. I bought two, and have had them on some really hard pounders. They're still alive and well, and in current use. They're the old version, and not made the same any longer, so knowing that, I haven't bought one since, so who knows.
If you're looking at $300.00 as a maximum limit, I'd choose a Weaver variable.
That's what I've got on my 15" Encore .243, and it's held up very nicely.
The optics are crystal clear, and the field of view is almost as wide as my Burris, for a much smaller scope.
I've given the new (Meade) Weaver's a try at the behest of a good buddy, during an FBI sniper academy we attended together. He's constantly testing gun components, bipods, scopes, mounts, etc., for police work, and he told me I ought to try the new Weaver's as their V16 & 24 lines were every bit as good as all but the top of the Leupold, Burris and Nikon lines. I did, and he was right.
The top of the Weaver line, the "Grand Slams", I think, are even better than the others and I love their features even more so.
My one older 2X7 Burris (that's on my Striker 7mm08) is a great scope, and has an adjustable objective (which usefulness is in question on a handgun scope), but I think any of those higher magnification Burris handgun scopes are a bit over the amount you mentioned.
Of the others like Nikon, Leupold, and Bushnell, etc., they'e also great scopes, but again, their prices are an issue. You can always go used, if you know a scopes been taken care of. I never buy used unless I know it's history.
Using a rifle scope has been done by some, and if you're quick to move your face if need be, great, but I've started using pistol scopes when they first came out, and really haven't had a problem.
I personally wouldn't use a rifle scope on some of the guns I have. I've had a broken nose in the past, and I know what that feels like.....hopefully never again.
Many have described that they sight close through the scope, then back off so they can only see the center....what's the use in that ?
Oh well, enough babbling....good luck,
Bob