Larry,

I beleive that when shooting damascus guns the Pressure issue is a high consideration and pressue tends to be greater the lower one goes down in shotshell size. If you have a recipe for a low pressure 410 load you should be fine, however I have been researching 16ga low pressure reloading data for sometime and it is not as avaible as I would wish. I would think 20ga and .410 maybe even more scarce. Unless of course your using black powder?

Kurt