Thank you, David. I used telescoping gauges on the inside of the chambers and forcing cone in conjunction with micrometer outside, and the thinnest I could measure up to 5" deep from the breech face was 0.163". I don't have the equipment to accurately measure deeper, though, so I'll leave that to the gunsmith. I will try the wad checking trick, though, once my RST shells show up. I just ordered a flat of the 1-1/8 oz loads.