Right pellet for AA Tx200?

[tonaka]

Hi everyone!
I finally got my TX200 yestoday and I was really shocked at how nice this rifle looks.
Of course I can't just look at it and I brought it out to sight it in and see how it shoots.
Well, I thought that RWS superdomes would be good for it but they were all over the place. I chronied them and they were going 750-760fps and they weigh 14.5gr
I took JSB Exacts and they weigh 14.3gr but they were going 696-719 fps. They even went 400fps two times. What the hell. I thought for a moment the spring has problem but then I went back to superdomes and they were going again consistent 750-760fps. Doesn't make any sense to me JSB are lighter but going slower.
Than I took Polymag Predator which weigh 16gr and they were going 694-698fps.
Can anyone tell me why lighter JSB going slower. Maybe the fit is not snugg enough.
Anyway, what is the best pellet for TX200 from your experience?
Thank you

[Gene_SC]

My TX Loves JSB's and CP's. But of course iti is a .177.

[tonaka]

Thank you Gene!
Any idea why lighter JSB going slower than heavier Superdomes in my gun?

[Gene_SC]

I see that allot but the only logic I can come up with is the design of the pellet skirts and how they fit the bore.