Calvin,
Nice shot is pretty soft as measured on/via the Brinell scale.
https://en.wikipedia.org/wiki/Brinell_scale
This link is to an article by Randy Wakeman on this Nice Shot hardness subject:
http://www.randywakeman.com/Nice_Sho..._Pressures.htm
If you load Nice Shot in a plastic wad such as an SP-12 you should have no problems. I've shot a lot of geese with Nice Shot #2 and a dozen or so with Nice Shot size BB (when I could get it) from Damascus barreled Parker 10 gauges. I've also shot a few using LC Smith 10 gauges with constrictions of .050" but the results were not as good as with my Parkers. I wondered what was the cause only to discover...
The .051" constriction may be too much for BB. Large shot usually doesn't require much constriction to produce dense patterns. Please let us know what size patterns or "choke" your gun produces with BB Nice Shot.
Mark