

As the full wadcutter is commonly loaded in .38 Spl. cases, manufacturers of loading dies normally include two seating plugs to accommodate all popular projectile profiles in this caliber. Occasionally, none of the factory provided seating plugs will seat a certain bullet without deforming the lead. The manufacturers realize this, and will make for you a custom plug for less than $5 if you send them three sample bullets. You didn't specify if you are loading cast or swaged wadcutters. Cast bullets are generally of a much harder alloy than their swaged, or cold extruded, counterparts. A seating plug that is a close but not perfect fit can be used on the harder cast bullets without experiencing any deformation.
Sincerely,
R. Mermelstein