"Long Range" ??
Define "long range" ??
There are a couple companies that make a pistol scope that is up to 12X(3X-12X IIRC). There are a few that market scopes that go up to 7 or 8X. When mounted waaaay out at arms length, that is all you can control as far as cross hair movement on target.
I have tried several of the IER/LER scopes lately, and 6X is 'bout all I can control on a long bbl'ed, fairly heavy, single shot, hunting pistol. This,even with the front on bags or bi-pod and the rear supported by a bag or my fist.
As stated above,a pistol scope usually starts off with 12 inches of eye relief for a reason. They will go up to 20(or so) inches for the same reason. I have some experience with a 4-12X rifle scope mounted on a bolt action target pistol but that was chambered in 22LR. BTW,it worked great.
If possible, would suggest that you try 'em before you buy 'em. -----pruhdlr