hello oldcolonel

good to here the double is shooting now
the correct bullet size for the 10,75x52R springer's is .424 but with a .428 barrel and the thin jacket .429 pistol bullets I see no danger in using them like the are. test will showing what works best for you

safe the pics

J. Bury Dbl. Hammerless Rifle, 10 X 75, 26 1/2" bbls., ejectors, Belgium proofs, left bbl. is marked "ARP Sicra.liege", open rear sight, ivory bead front sight, double locking lugs, top tang bbl. release, cross bolt locking mechanism, checkered PG stock, double triggers, checkered wooden buttplate with serrated grooves, engraved screws, light engraving on frame, sling swivel eyeletts, exc. bores, 95% blue raised full length matted rib, exc. wood, leather case included.
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=354498090