I tried the 18.13 gr at 50 yards with and without magazine and it seems that it only likes the 15.89 s![]()
Was this the first time you tried shooting the 18.13gr? Just because my barrel on my Huntsman likes both 18.13gr and 15.89gr JSBs' almost equally well, it doesn't mean that yours will. That's just the way it is sometimes. Although generally, they should be very close.
Are you cleaning the barrel too often? The only time I would clean the barrel is on a new rifle and if my groups start opening up after I have been shooting the same pellet for awhile without any changes made. You also might want to try different batches of JSB 18.13gr. Try some Air Arms, FX, and Daystate Sovereigns 18gr. They are all rebranded JSBs'.
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