Hmmm - Quickload says that at 61.5 of N560 with the other data you've provided that you'll be getting 3072 fps - at at predicted 69750 psi - as the velocity predicted is pretty close to actual I'd say the pressure is too . . . . when I first started reloading 65,000 was the limit of what primers and brass would take but they seem to have improved - however its not territory for the faint hearted! Case capacity of H2O would be interesting to see if it got QL a bit closer to actuals
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