Shotgun barrel wall thickness gauge11/9/2022 ![]() Winchester did extensive research in the late 1950s comparing the pressure curves between smokeless and blackpowders in shotguns including graphing pressures for each inch of the barrel. Second, you need a good understanding of internal ballistics. First, the steel used in barrels for smokeless powder is far stronger than what is commonly used for black powder barrels. If you are attempting to arrive at a barrel wall thickness on your own you need to take some things into consideration. No one will manufacture a barrel that isn't safe. If I go for 2mm wall thickness with 34CrNiMo6+QT, will that give me enough safety factor for my black powder pistol?Īre you planning to make your barrel from scratch? If you buy a commercial barrel then the wall thickness issue will be solved for you. The minimum wall thickness with class 1 steel for a 20 gauge or smaller shotgun according to the chart is 1.9mm and for category 3 1.5mm. Here’s the mechanical properties of my steel:ħ00 is the minimum elastic limit for category 3, and the combination of hardness might be bad? Regarding the chart of minimum wall thickness in the source above, the steel seem to be within the range of grade 3, however there’s a range of mechanical values that makes it difficult to categorize. According to the charts of this material it seem to come as both cold drawn and hot rolled barstock, however the mechanical properties are similar. I’ve been looking at a steel named 34CrNiMo6+QT, I can easily get my hands on this steel and it’s already quenched and tempered. With black powder, where does the pressure peak? In a black powder revolver, does the pressure peak in the cylinder or in the barrel?Ĭlick to expand.I’m searching for a proper steel to use for this project. In comparison, will the load I’m using have higher or lower pressure compared to the pressure generated by a 28 gauge modern shotgun?Īccording to this resource the minimum wall thickness at the chamber area for a 28 gauge shotgun is 1.05mm of best steel, and 1.9mm if you use the weakest steel that’s included in the list. In which pressure range will such a load be within? It’s hard to find pressure values on black powders loads, however it seem to me that black powder is in most cases low pressure compared to smokeless. ![]() 53 roundball (weight 231 grains) and the maximum charge I’ll ever use behind that roundball is 80 grains of pyrodex P (FFFG). The pistol I’m making will be loaded with a. Does the ”honeycomb” construction of a revolver cylinder make it stronger than a single barrel? The reason why I’m ask is because I’m trying to figure out the minimum safe wall thickness for a single shot black powder pistol. ![]()
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