J.T.King: When you get to about 1,400 ft/sec, you need either a gas-check bullet or something as hard as the Laser Cast.
Gas checks will let you get on up to around 2,200 ft/sec, IIRC.
I'm basing this on some comments in Phil Sharpe's book, and my experience with the 169-grain lead GC in the '06. In the '06 with that bullet, 20 grains of 2400 gives around 1,900 to 2,000 ft/sec.
FWIW, Art
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