I've loaded for a few Creedmoor and .260 with.143 ELDX I use RL26 and Hodgdon superprofrmance in a 20" you can push close to 2800 so an 18" you should be getting over 2700. These are seated long in a Tikka with long mag and bolt stop.
I know @buzzman load an 18" Creedmoor.
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