This data is a few years old but likely close
Aguila 12ga MINISHELL 1 3/4” 5/8 oz. shot 1,175 fps; 11,000 psi
Federal 12g SHORTY 1 3/4” 15/16 oz. shot 1,145 fps; 9,500 psi
Dave: why are you using 2 1/2" shells in a 12g Parker? Are the chambers not 2 5/8"?
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