I don't trim handgun brass so even using Hornady brass and Hornady bullets I never can exactly match the manuals OAL
For the OP .003 in 38 special is not gonna matter. Even using lead bullets with a crimp groove. How wide is the groove or the cannelure on a jacketed bullet? There is thousandths of room to work in. The cannelure on a Hornady XTP is around.065" wide. So to me .003 is not a issue.
Just get in the groove and shoot them.
For the OP .003 in 38 special is not gonna matter. Even using lead bullets with a crimp groove. How wide is the groove or the cannelure on a jacketed bullet? There is thousandths of room to work in. The cannelure on a Hornady XTP is around.065" wide. So to me .003 is not a issue.
Just get in the groove and shoot them.