Stroker

Shooting steel, because of the density difference between steel and lead the following occurs. With a modified choke installed for lead shot the choke actually becomes a full choke using steel. An improved choke for lead would be a modified choke for steel and of course a skeet choke for lead would be an improved cylinder using steel. Simple enough.

I dont know what mod you could make to improve the value of a stock firearm. Most folks want the weapon in its original condition and anything detracts from that.

What kind of shells were you trying to use?