It is always prudent to get an old Parker evaluated by a competent double gun 'smith before shooting it.
However... if the gun proves physically safe, there is no reason to stuff it with magnum ammunition, even though it may be chambered to accept such. In fact, it is probably detrimental.
Destry's recco is the best. RST has nothing on its charts that would likely harm such a fine Parker. Personally, I'd never put more than a 1 oz. mild load through such a gun. For 99% of all shooting, that is more than adequate.
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