There is no provision for limiting the cost to $10 to do multiple transfers. Assuming that they will do what makes sense, is just that, an assumption.
Neither I nor anyone else can slay the monsters you imagine in your fevered dreams. Look into getting an FFL yourself so you can limit those $300 a pop transfer charges?
"The only real difference between the men and the boys, is the number and size, and cost of their toys."
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