I am currently using the stated No 9 4.53 and to be honest they are not the best looking pellet I've had .They have a slight rib where the mould is not perfect But they seem to group well for my Gun @ 47.5y and 53y (targets set out at this range) .if anyone using Facebook and a member of The pellet exchange page I have put a picture up there of them .
Used them yesterday @Sywell and they were Spot on.
I don't faf around with all this weighing and washing but each to there own .
The thing I have noticed as well with the batches/dies at the moment from JSB are some have a deeper back to them. I will post a few pics on my page later to show some .