Need help with starting load for HH in 308 with benchmark

[Caulder]

Loading up 137 hammer hunters in a 16 inch 308 with a bisley chamber, lapua brass, .003 neck tension. Powder is hodgdon benchmark.

I checked out the hammer spreadsheet and only see benchmark for 308 124gr hammers, with 3200 fps with 46.5 gr. Seems a little hot, and the 137s are heavier so I don't want to go too high.

Looking to start low and safe. Anyone have a recommended starting point?

 

[Caulder]

No one use benchmark for 137 HH?

 

[SouthLoganCountyShooter]

Sierra list 47 max with 135 cup core. I'd start at 44 and go up. Hammer hunters usually don't create as much pressure. I'm running 47 tac with 124hh no pressure and 3250 with lrp.

 

[Seabeeken]

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