Weaver 3-15x50 Tactical

Save it for a dedicated PCP & slugs. Parallax would be set at 100. I personally wouldn't bother using slugs for anything closer anyway. Just my thoughts. 
There's very few airgun scopes of high quality other than top tier FT one that would focus at the seemingly required 10 yards on maximum magnification. 
I can't see any other need than a scope doubling as a rangefinder in FT with pellets so no big downside for many. Sell it if it doesn't fit your requirements.