some drillings were made to shoot relatively high pressure rifle loads and slugs...most parkers and most other pre war made double guns were not made to shoot modern slugs. plus, keep in mind that the most fragile part of a gun is the wood. the older the wood the more fragile it is...please do not damage the wood on your old gun by shooting high pressure ammo, particularly modern slugs.
ever see an old gun with the barrels stamped "not for ball"? there are reasons for that.
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