Non Linear Barrel Preference Of Pellets

"chasdicapua"I tested 4.50 - 4.55 pellets through my new RAW TM 1000. Tested 8.44, 10 and 13 gr JSB pellets. It clearly liked the 4.50 least and the 4.55 best (bummer for pellet sizing), but the trajectory was not linear. It likes the 4.52's better than the 4.53's and almost as good as the 4.54's. Anyone come across this? Explanations?

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It isn't just head size that is influencing your experiment. Skirt diameter and weight also will have an impact. Too many variables.

If you are using the head size marked on the tin, that would explain it. My experience has been that the marked size has no relevance to what is in the tin. If you haven't measured or sized the pellets to a known size you are guessing. 

I just come across your thread!, and I too have run into similar results, my TM (LW Standard barrel) seems to like 4.52 the best of anything smaller than 4.55! This is in the jsb 10's or 13's, the pellets that it really likes r the CP 10.5's! (Die #6)The head on those seem to average around 4.52 none larger I've found in the supply I have, these r quite old? Haven't tried any new CP's? (Note I get the unexplained flyer in the CP's that will ruin that awesome 10 shot group but even with the flyer the group is smaller than the 10.3 jsb's!)

nomo65 what is yr group spread in mm ctc for your 10 shots at 25 meters and at 50 yards?

On 1-22 & 1-23-17 it was in the mid to upper 40's temp. Little to no wind!,So i decided to do some shooting (3 ten shot groups apiece)to test some jsb 10.3 & 10.5 cp's,the cp's group1- .120",group2- .170",group3-.154" these were washed & waxed not weighed!, the jsb's averaged slightly larger .169" to .209" note: Photobucket sucks! So i will post pics when i can? These groups were @ 27 yds.,groups are measured outside to outside than subtract the caliber (.177") in this case

interesting the cps were tighter shooting than the jsbs. any reason the cps were tighter shooting do you think?