Thank you Drew. I have just looked up the numbers again, and the relative densities are:
Lead: 11,343
Iron: 7,300
Bismuth: 9,600
Tin: 7,260
Zinc: 7,070
Aluminium: 2,705 only
Until someone analyses some BioAmmo pellets we do not know the ratio of elements used, but if we assume 25% of each then its ratio will be 6,660. This is 59% of the density of lead, or 91% of the density of Iron. My weighings showed it to be more like 85% of the density of iron.
So my hunch remains that Bioammo will be useful in older guns at shorter ranges. It will be difficult to get many into a 2.5" cartridge case.
In any case all this is academic as Bioammo is now sold out here in Britain for this season, according to JustCartridges. Maybe next year will bring some improved loadings...
HB
