It depends quite a bit on the wad you use.
eg. If the load has 1 oz of shot, then use a ! 1/8 oz or 1 1/4 oz wad. That gives more room for the shot.
You may want to give the wad a bit more pressure as well. Just to get those petals down to the crimp level.
However you can work it so that the powder, wad, shot column is the right length for the shell.
O.M