I know the Alliant load data doesn't have anything about 100 gr. bullets for 327 Fed Mag. Why they do such a small selection of data and powders is beyond me. I would guess that Blue Dot would be a fairly good candidate for use with this caliber.
If the Federal Cartridge Co. ever gets some brass on the market many of us will be buying lots of 500 and 1000, being edgy about future availability. Midway just shipped a backorder of 32 H.&R. mag so Starline has produced some of that.
If I live long enough to get some brass and then get to the range with a chrony, I will post results here. I plan to retire in 2 years, so maybe 327 mag brass will be available by then.