I found CPHP's in the tin were not uniform. About half were tight in my Benjamin Trail XL and half were loose. They shoot like different pellets so I had to sort them. I did not measure with calipers as it was pretty clear which were tight or loose. I found the loose ones shot a lot better. Maybe you can try sorting them if you bought a bunch of them. Otherwise maybe move on to JSB's or other pellets with a better uniformity. I have found JSB's to be uniform.
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