Huntsman's change of heart

Well, I don't have an answer, except to remember the old saying, "if it ain't broke.......". It's hard to imagine how that gentle pull-through cleaning could have done harm. Good luck. If it once shot that good, it can again.

The CPUMs don't shoot as well as before, but Polymags, JSB 8.44s, and Mako 10.5 slugs shoot fantasttic.

I thought it weird the CPUMS would shoot great at first, and now not so. Maybe they prefer a "new' barrel?

I'll have to add it to the list of things I don't understand, which is getting mighty long! The only thing I might suggest, shoot nothing but that pellet for a full tin, see if it comes back. And I assume the pellets are from the same lot, sometimes variances in dies will cause lot-to-lot performance issues. 
 
Has this happened to anyone before? I bought about 30 tins of JSB 13.43 before the pandemic and still have about 20 tins left. The Huntsman hasn't been shot for 3 weeks and I also noticed I didn't have a 40 yard holdover mark for it. At forty yards I noticed the pellets were all over the place. I figured the barrel needed to be cleaned. After cleaning the barrel, I shot the 13.43 grain and the 10.34 grain. The 13.43 was still shooting the same but the 10.34 group were touching. I must've shot 50 pellets of each weight and the 10.34 out shoot the 13.43 everytime. This sucks because I only have about 5 tins of 10.34. Every pcp I've own has always stayed with the same pellet but the Huntsman had a change of heart.

JSB 10.34 at 40 yards 5 shots
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JSB 13.43 at 40 yards 5 shots. The pellet hole at the very top was my POA

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It could be that the air is turned up to high for that pellet. It might do better if the regulator is turned down slightly or it could be needing to be turned up just a bit.