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My bore slugged at .451 and the hardcast are at .452 - no leading has been observed.
I've read that 2400 needs to run at magnum pressures to get accurate. I would tend to believe that based on my work up for this cartridge. I started at 17.5 gr and went to 20.5 in .5 gr increments. It didn't start getting accurate until 19gr. The increase in velocity/increase in charge fell off at 20gr.
With 19.5 gr running a little over 1500 fps, accuracy was good, and pressure signs were well below "pushing it", I chose that load as the sweet spot.
As always, work up loads in your gun based on loading manuals information (not mine).
Jim
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