[ithacaartist]

Mr. Dropover,

What Rick is referring to is the piece of tape one applies to the top rear of the frame in the area the heel of the rear toggle link touches at full recoil. Most Lugers have the marks resulting from this contact. You'd want to build your powder charge up until you get full, effective, and reliable cycling--but not so much powder as to cause the heel of the rear toggle to bite entirely through the tape. Staying below this level will ensure you're not bottoming out the action. Just examine the tape after every gradation of powder you try, and when the contact starts to become evident, go no further in load power.