I just bought a 340PD and was shooting PMC 135g 357 loads. I noticed I could not have my left fingers anywhere near the cylinder or else I got severe powder burns from the cylinder gap. I am used to shooting my wifes model 68 which is pretty much the same gun except in 38 spl. I have never had any problems with this using the same shooting form.
I was thinking it might be the ammo. There appeared to be a lot of unburnt powder in the barrel and chamber after firing.
Can someone suggest a cleaning burning ammo for this gun for plinking?