Here is something that i have often wondered about parker 20g chamber lengths. As we know, a many of them are 2-1/2” and that is what this thread is about.
Take 12g as an example. Parker bored their chambers at 2-5/8” for intended shell length of 2-3/4”. The 1/8” shorter chamber was intended to provide a better gas seal at the forcing cone and result in better shot penetration. 12g hang tags state specifically “chambers: 2-5/8”... Use: 2-3/4” shells”.
Now, what was the period length for commercially available 20g shells? 2-5/8” or 2-3/4”. The above short chambering in parker 12g guns would suggest that if they followed suit in 20g, then the intended shell for a 2-1/2” chamber would be 2-5/8”. The same 1/8” difference. 1/4” seems like too much difference.
Does anyone have an example of a 20g hang tag showing chamber length and the intended shell length?
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B. Dudley
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