I'm loading 110gr by vol of FFG H777 with a 240gr XTP Thompson sabot and a CCI plain #11. 24" barreled Thompson .50.
When I adjust the MV input for JBM Ballistics to fit the observed trajectory, I get a MV of about 1275 fps. The 777 jug says I should be getting about 1800fps.
Any idea about the reason for the discrepancy?
Sell that ML and buy either a break-action or fall-action ML with 209 primers.
