36 Cal Navy Model

A lot of Euroarms revolvers have chamfered chamber mouths and don't shave the lead ring. You can look at the ball after it is loaded and see how the excess "rolled" up around the end of the plunger.
 
euroarms tend to have the same chamber dimensions as Pietta. .375 should be good if there is a tight swage-down upon loading whether or not ring gets shaved. Uberti has somewhat larger chamber mouths and often prefers a .380". I've found that Speer balls are round and their .375s work in my ubertis. Hornady balls are often a bit lopsided and will slip into the chambers with no friction.
 
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