Hi,
I am shooting the creedmoor.
My gun is a bolt action with a 27" true flight 1 in 8,5 " twist
I found the 140 gr not performing best in that barrel, maybe due to the twist being too slow?
I was loading 40 to 41 grain of AR2209 . At 41.5 the load was to hot and the bolt sticky.
I don't know how long is your barrel but the 120 gr a max and 130 gr Berger might give you a better performance .
I am not sure the old sierra 155 would stabilise in 1 in 8,5 twist with the slow speed you would get out of them.
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