JSB exact pellets. Normal 8.44 gr or heavies 10.34gr for sub 12 springers????

[Alakar]

Both !
I've used both in my springers to great effect .
Currently though I'm using the lighter ones in springers and the heavies in my PCP .
Try both , only you and your rifle can decide which is best.

[MikeHW45]

Both !
I've used both in my springers to great effect .
Currently though I'm using the lighter ones in springers and the heavies in my PCP .
Try both , only you and your rifle can decide which is best.

That's the same way round I've been using them to be honest. My S510 loves the heavies where as my springers tend to prefer the 8.44 variety whether it be JSB or HN sport etc. As Tinbum correctly says the extra weight thus affects trajectory and muzzle velocity which is what made me wonder which ones people prefer and why.