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Browning xbolt eclipse target 6 Creedmoor

Still doing load development. Rl16 and 108's 42 grns will put me at. 3150ish. Clover leafs 3 shots and Then a 1/4” flier for 4th shot. groups at 100 yards. I can say not sure why but barrel heats up quicker than some of my others.
 
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My guess is slight carbon ring or measurement error on initial measurement. I've had it happen also with Hornady tool: used different force on new vs subsequent measures and ended with different readings.

I measure with 5 different bullets using firm pressure and use the shortest value as reference. My typical variation is -+.002 from reading to reading with Hornady/Sierra. Berger's tend to be closer to +-.001.

Also if your using the actual exact same bullet as reference for multiple readings, it's very possible it's slightly dented and would give short readings with successive measurements.