So far I've been using the 25.43 JSB's. I also grabbed a tin of the Benjamins and tried a few as well...not hitting the same POA. I checked the baffles yesterday and found some lead flakes,so I presume there may be some contact. Would You suggest enlarging the holes at all? The grouping aren't too shabby but I'm open to any suggestions. I also picked up a Mk 4 Hill pump and a ProChrono crony at the same time,It felt like Christmas in May!