Congratulations on a nice parker Randy.
You can shoot most off the shelf shells in your Parker but many of use low-pressure loads - not because the gun can't take higher pressures, but because there is no need to subject the guns to the pounding from shells that are manufactured to operate any and all modern autoloaders. Further, your chambers are probably 2 9/16" and if you use 2 1/2" shells you will likely experience less "felt recoil" than standard 2 3/4" shells.
JG are the initials of James Geary, a barrel maker at Parker Bros. in Meriden CT.
The 3 and 15 is the weight of the barrels before striking.
The upside-down cross is likely a 4 indicating lbs. and the 1 is likely for oz. this 30" set was probably 4 lbs., 1 oz. before striking.
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