I just picked up a box of these for my Dad's 38 spcl with a four inch bbl. What does nyclad stand for? What's the blue coating made of, and what does the coating do for you? Thanks.
Nyclad stands for "nylon clad" since the blue coating is nylon (plastic). The coating eliminates all the airborne lead that you would normally get from a lead bullet.
Add to that, the nylon is much softer than a copper jacket so with a soft lead core you will see better expansion from lower velocities with the Nyclad.