Tom

I would recommend having the forcing cone polished and lengthened if you're really serious about getting the most out of your shotgun.

In layman's terms, the forcing cone is the constriction in the barrel just beyond the shell's chamber. In a lot of popular guns, it will be less than 1" and be very rough. The wad will again be smashed down as it passes through the choke at the end of the barrel.

A short, rough forcing cone disrupts the smooth constriction of the wadding and bb's and it will ultimately send deformed bb's and an unevenly packed wad out the end of your muzzle.

A smooth, long forcing cone serves to make your pattern more even and consistent. Since your wad is compressed twice (once at the cone, and again at the choke) it is vital to make each compression as smooth as possible to maximize the effectiveness of the buffer material.

Obviously, it won't pack 100 bb's in the kill at 50 yards, but it will help make your gun more consistent.

If your curiosity is piqued, do some more reading about it online or call a good gunsmith.

I hope my advice was useful

Quik