FX FX M3 Compact .25 Pellets

I dont think you will be able to find a 25Cal pellet that is too heavy for the standard STX Superior liner. A lot of Impact owners shoot the ~34g JSB/FX with great accuracy. Now if you are talking slugs then you for sure will hit a point where the slower twist rate wont do well with heavier slugs. Low 30s is about all I would try but there are lots of great choices in that range. I would suggest trying some 34g pellets and some lighter ~25-26g pellets first.
 
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I picked up a used M3 .25 Compact barrel I'll be putting on my MKII. It has the standard/stock liner. I'm pretty new to this and was wondering if there's a max recommended pellet weight you can shoot through the standard liner? Thanks.
Good question, 33.9 for sure. I can launch 25.3's out of my .22 MAVERICK Compact 500 but I did put the new heavy soda straw, it really did help with the higher twist rate even with light pellets at higher speeds so heavier than 33.9 is possible with a higher twist rate liner, I"ve found that the AEA 33.9's work awesomely well in my Mav. VP 600.