Parker patterned your guns with 1 1/8 oz 3 dram loads. You can buy these today from all manufacturers.
Your gun was intended to shoot up to SAAMI max loads of the day, generally around 9800 psi . You may want to review the table of proof and working pressures in The Parker Story.
5800 psi has no basis in any Parker literature. Persons may desire to shoot reduced loads for their own reasons or because of a poor condition gun, but lesser loads for either chamber pressure or recoil were not Parker requirements.
Shells marked 2 3/4 " will vary from 2 5/8 to 2 3/4" when shot per SAAMI standards. These will be fine and will result in an approximately 300 psi pressure increase on an average 8000 psi cartridge. You may wish to review Sherman Bell's tests reported in the Double Gun Journal.
|