Guys - recently aquired a Rossi Pomba single-shot in 44 Magnum with full length over-barrel suppressor .

loaded some ammo with new Winchester cases , older CCI primers , Unique powder and Hornady 240 gr XTPs . Getting occasional non-fires - primer is struck and dented but not apparently hard enough to fire . Cartridges fire fine in my buddies H&R Handi so it is either a weak firing pin spring or a hard primer problem.

Before I pull the gun apart I thought I would ask your advice ...?

Check firing pin protrusion first ,should be about .060" .