i asked this same question a while back as i've got an army & navy SLE that had a broken right pin. had a machinist buddy make a replacement and a complete spare set while he was at it. his replacement protudes far less than the original on the left. i measured it and don't recall but i think it was about .030". so far it's run 100 rds of reloads with cheddite primers in 2 different hulls plus 75 rds of B&P 2.5" shells. granted, i alternate barrels every so often but at least half those went out the right barrel and all went bang just fine.
i agree with "the less the better"; the minimum that gives 100% ignition.
roger
