Your early Parker was made to be used with metallic shells in conjunction with black powder of a specific length as the chambers do not terminate with a 'forcing cone' but rather have a 'stepped' chamber termination. However, the use of dirty black powder is not necessary as long as the 'modern' shells used in your gun not exceded a certain low pressure... but first, have the wall thicknesses measured with a digital wall thickness gauge.
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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