Lead bullets typically deposit lead in barrels because they didn't properly seal the bore against powder gas "blow by". The hardness of your alloy should ideally be matched against the velocity/pressure they will be fired at.
There is a formula for optimum bullet hardness, BHN (Brinell Hardness Number) as follows:
Optimum BHN = Pressure in CUP รท 1280
Because you can't always pick your perfect BHN, cast bullet shooters usually fire bullets that are .001-.002" larger than the bore diameter to ensure a good seal. This gives the best accuracy and the least barrel leading.
2400 is used in many medium and light cast bullet loads in rifles, so there is nothing unsafe about less than "full house" loads in the .44 mag with lighter bullets. Make sure you have plenty of neck tension and use a good roll crimp to help eliminate unburned powder residue.
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