10GA FH..a NEF 10ga, medium to heavy wt smooth barrel.
28" long, gun weighted to 14lbs. factory FED 765gr loads
are 1300 fps. 200 gr of first powder tested is 7383 surplus
and the regular shotgun primers got 765 gr to 1600,
for 4300 ft lbs. Case won't hold anymore 7383.
We will test 4227 with the same slug , and saboted slug
of some design. The 765 gr Fed slug is hollowbase for
smooth bores. Roll crimped with crimper in drill press.
Case expansion with 7383 very little(.006") like
the factory loads. 3.5" plastic cases.Ed