[kds99]

Does powder absorb moisture out of the air? Was wondering if absorbed moisture could affect the weight of powder going into each charge?
With h110 and not droping below 10% of the recomeded min load, I think I may have loaded these rounds light. It was very humid and cold when I was loading these rounds

44 mag 22.0 grains h110 This load was giving presure signs I think, swelling near the rim of the case, but was only about 1500 ft/sec out of a marlin 1894 lever action.

I was able to get about 1700 ft/sec with this load the first time I tried it.

I also changed bullets between loadings 1st time was a 240 grain cast swc

This time was a 240 grain jhp

Sorry is this is basic stuff, but I really didnt expect these results from this last loading

[Ol` Joe]

Powder will absorb and loose moisture due to humidity but I doubt it will be enough to cause pressure problems with your loads. Figure if they gain or drop say +/-1gr due to moisture with your 20 gr charge it is likely a large amount.

[flutedchamber]

With everything else being equal (powder type and charge, bullet weight, primer type), the jacketed bullet takes more force to push down the bore than the cast one, thus giving you a lower velocity.

I have loaded H110 in 44 mag for pistol with 240 grn jhp. With a 23.5 grain load, which is 1/2 grain under max, I experienced no unusual case expansion, or primer flattening. Velocity was 1700+ fps out of a 10 1/2 inch automatic pistol barrel.