How much can you increase the leade? .01"? .60"?
No, the leade can't be more than it is in the M16 chamber or you start to see a drop in accuracy and barrel life (shot out barrels have the origin of the rifling moved forward due to erosion among other things, so moving the origin forward is basically the same as pre-wearing out the barrel).
How much slower can you make the powder before you start to exceed the maximum port pressure? The powders that we have now are pushing the pressures to get the velocities we want. To put it a different way - What powders will give better performance out of this cartridge than we are getting today? None, because if there were such a powder, we'd be using it.
Unless some genius designs a powder that instantly reaches maximum pressure, holds flat at the pressure for about 250 microseconds then drops instantly to 12,000 psi and holds that for the next 300 microseconds then drops to zero, we reached the limits of this cartridge-bolt design.
Make a better bolt, you get a little bit more performance, or better bolt life, pick one.



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