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I have a 28 ga Parker vintage 1917-18 with a chamber depth (?) of 2-3/4” and need to know if I can use 2-3/4” RST shells. I based my assumption of chamber depth on the fact I measured from the breech to a definite ridge in the bore that can be felt as well as seen. After reading about chamber depths and the use of gauges to do so I am wondering if I may have measured incorrectly as it appeared maybe “too simple”.
Chamber depth
Threaded Mode