Hevi-Shot
Two seasons of Hevi-Shot thru my Nova modified "lead" choke has worked just fine. I do suspect some of the Browning Invector shooters should use the I/C choke as the Browning's seem to be just a bit tighter and the constriction is in a shorter length. The Invector Plus should work fine in the modified. I tried the full choke on my NOVA and it seemed to blow the pattern some what.
Note, the Federal Tungsten did not pattern well with the 'lead' modified choke, but did fine with the I/C. I don't shoot steel so cannot help. Steel is too expensive to shoot.