Just loaded up the following subsonic recipe:
Boolit: "NOE K-31" ACWW, Sized .309", Gas Checked, tumble lubed in Xlox
Case: Prvi 7.5x55
Powder: Red Dot - 6.0grs
Primer: Fed 210
If you are like me and only have access to an indoor 50' range for the majority of the winter time then perhaps you are looking for some sub sonic cast loads for indoor use. My range doesn't allow any jacketed rounds or magnum rounds, so I found the following load on a site listing data for the 30-06 and decided to just give it a roll in the 7.5x55.
I was blown away by the accuracy of this load, all of these targets were shot standing in the offhand position at 50'
Each target represents a 5 shot group, except for the very top left which is 3 shots: