TPS in the chapter on barrels includes generalized load limits by gauge including service load and proof psi. The Parker Small Bore Shot Gun pamphlet includes recommended loads. I have previously posted photos here of those tables for those interested, the last time several days ago for recommended shot shell loads. Hang tags included with each gun state the loads that Parker used for pattern testing that gun. Many users conclude that such pattern loads are correct for their gun.
In answer to Mr. Reed, 1900 has no special meaning for Parkers. All Parker barrels met proof standards at the time, first at 13,500, then 15,500. Parkers met SAAMI standards. Proof loads do not define rupture limits. There is no evidence that any given Parker barrel composition is superior in rupture resistance than any other. Parker built guns intended to handle stout loads. The Small Bore pamphlet on pp. 6,7 provides recommended 20ga loading matched to gun weight.
Persons interested in Parker shot guns are advised to study The Parker Story; most Parker questions are answered in it, besides it's a great read. Persons interested in Bernard barrels may be interested in Leopold Bernard and the history of French canon making; the Bernard canon used by Napoleon's light infantry enabled his armies to move faster and over greater distances and out-maneuver opponents. Bernard shot gun and rifle barrels were the prized French designer barrels of their day and used in best guns.
Parkers made with Bernard barrels are known in D, C and B grades and in 10, 12 and 16 gauges. I am still looking for any of the few 20's made.
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