Parker Order Book No. 20 documents a D Grade Top Action Hammergun SN 47735 ordered May 17, 1886 by A.W duBray; 32” barrels with PG; LOP 14”; with 2 1/4” DAC and 4” DAH!
OTOH in 1887, Parker Representative W.S. Perry ordered a C Grade 10g with a LOP of 14 3/8" and DAC 1 1/4” X DAH 2”
Scroll down a bit more than 1/2 way here for a list of Parker dimensions in 1901
https://docs.google.com/document/d/1...o/edit?tab=t.0
Optimal dimensions are highly related to one's shooting style; crawling the stock vs. head erect vs. head well off the comb
DAH probably doesn't matter for this fella crawling the stock
