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In the studies I have read particle size is only important when you consider the absorption rate vs intake, they found that calcium bigger than 2mm had better overall absorption rates per intake... This is because the bigger particles get stuck in the gizzard longer and thus there is a higher...

I fully beg to differ, can you point me to the studies that show this? Both calcium powder and ground egg shells can provide sufficient calcium for laying birds if offered in sufficient quantities... The calcium in commercial 'layer feed' is nothing more than calcium powder, so the statement...

Rather than crush up expensive calcium supplement pills or pay a premium for 'reptile' calcium dust, just get some cheap antacid pills and grind them up... Drop them in a plastic bag and hit with hammer... Just verify the ones you purchase are simple calcium carbonate and nothing else added...