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I got a load from the HKPRO site, 42 grains of IMR 4895 behind a 150 grain bullet. Shot a decent group in the HK91, the M1A didn't like it......
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Forty two and a half grains of IMR 4895 is a common load with the 155 Nolser, so it may be the individual rifle.
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It is delayed blowback, so just about anything with a similar recoil impulse should work.
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Slow burning powders will have excessive pressures at unlock. The extreme case is if the pressure is high enough the case will burst or separate. If that does not happen you will over accelerate the mechanism and slam/bang things up.
It is better to use faster than slower powders in these mechanisms.