Lyman H p Proper bullet diameter is essential for cast bullet accuracy Lyman improved sizing dies now have 90 degree hole spacing for easier bullet lubrication, even with today's hard lubricants. Lyman sizing dies also feature a tapered mouth and hardened interior insuring alignment for perfect cylindrical shape. Interior dimensions correspond to suggested diameters for all popular rifle and pistol calibers. This is interchangeable with RCBS.
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