RPRNY
Member
Euro arms may indeed have offered the Lothar-Walther barrel on their target 1858. I can't confirm from personal knowledge.
This chamber reaming that is so often advised can be very dangerous. Especially in older Piettas with substantially underbore chambers. Chamber wall thickness on some cylinders is marginal, especially on the likes of the old ASM. They made a pretty gun but made them from a chocolate and tin alloy. Reaming such chambers even 005. - .006 represents a serious risk. Further, a chamber that is .003" or so under groove diameter is no great issue. While the inverse is to be desired (note ROA specs above), using appropriately soft lead BHN 8 -9 will allow for sufficient obturation with any 25 gr BP charge to fill groove diameter.
If the chamber diameter is more than .005" under groove diameter, that gun is a novelty item and noise maker and getting it to shoot somewhat accurately will be a labor to say the least.
This chamber reaming that is so often advised can be very dangerous. Especially in older Piettas with substantially underbore chambers. Chamber wall thickness on some cylinders is marginal, especially on the likes of the old ASM. They made a pretty gun but made them from a chocolate and tin alloy. Reaming such chambers even 005. - .006 represents a serious risk. Further, a chamber that is .003" or so under groove diameter is no great issue. While the inverse is to be desired (note ROA specs above), using appropriately soft lead BHN 8 -9 will allow for sufficient obturation with any 25 gr BP charge to fill groove diameter.
If the chamber diameter is more than .005" under groove diameter, that gun is a novelty item and noise maker and getting it to shoot somewhat accurately will be a labor to say the least.