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If you do decide to shoot the gun with standard factory shells, stick to the low brass loads rather than the maximum loads. It's not a safety issue, but the lower pressure loads are easier on old guns. High brass maximum loads are never necessary, in my opinion.
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Low brass, high brass doesn't mean anything when it comes to pressure. SAAMI pressure specs for 12-gauge 2 3/4 and 3-inch shells and 16-gauge shells are the same, 11500 maximum average PSI. Very likely those "low brass" promotional shells sold by Wallyworld are loaded to just as high pressures as a 12-gauge 3-inch Magnum shell. They need to work gas operated semi-autos.
No one can tell you over the internet what shells may or may not be safe in a given gun, that requires hands on inspection by a qualified double gun smith with the proper tools. Generally speaking 2-frame 12-gauge and 1-frame 16-gauge steel barrel Parker Bros. guns are plenty strong enough to handle SAAMI spec lead loads. What damages old guns, and old shoulders, is recoil, a function of payload and velocity. To be kind to old wood, and old shoulders, in high volume shooting like Doves or clay targets, stick to light payloads and keep the velocity under 1200 fps.