For a while my rifle shot good groups from close by all the way to 100 meter and was at its best at 940 - 950 fps. This morning I opened a new tin and the shots was all over the target. At 50 meter it opened up to 25mm and even 30mm groups.

I thought their was something wrong with the rifle. I took it to the 25 meter target and the groups was 12 - 15 mm. After some re-adjusting it settled down to 920 fps and did one hole groups again. I did try higher and lower speeds but groups where bigger.
I then checked the sticker on the tin and sure it was another batch, bought at the same time from the same dealer. All the other tins I received in the same parcel was another but all the same batch nr.
Just to show, always check for the batch nr when receiving and opening new tins.
5 Shots at 25 meter after adjusting. It started to rain so I could not test 50 meter and longer targets.
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