327 federal data

Lightest weight I’ve seen pressure-tested, published data for is a 77-grain cast lead. That’s on Hodgy’s site. Brian Pearce has a ton of data in Handloader magazine from February of 2015, but there the lightest bullet is a 78-grain cast. If it was me, I’d start with that data.
 
I used some of the 71 grain FMJ in my TC 10 for silhouette and with a rather warm load I got one hole groups at 25 & 50 meters. At 75 meters the groups opened up to the size of the turkey and at 100 meters I could not regularly hit a sight in target from a sand bag rest.
The bullets are very critical for velocity they are driven and if you load them keep them very mild and maybe they will work.
 
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