mixed dies and manufacturing dates. When I tried them years ago from my .177 R9 they weren't consistently accurate.
The boxed CPs from the cardboard boxes are supposed to be from the same die and "lot date". Years ago around die #7 (or was it #5) Crosman had major QC issues and I remember one box of CPLs that contained over 100 undersized pellets and three dozen that literally "free fell" through the bore.
I've been using boxed CPLs for years and the last cases I've bought have been very consistent........
Anywhoo.....I personally see no reason to buy the "tunned domes" even if they were available. Actually, my tight leade .177 HW95 shoots the currently available "tinned" Crosman Hollow Points OK however they're not very accurate from my looser leade .177 R9. Problem with the last tin O bought was that the pellets had excess parting compound on them which coated my loading fingers with what appeared to be powdered graphite.