The easy button is a 243 WCF.
There's nothing wrong with 6-06 .
I've had both.
Id run a 1-8 for the 105s.
Depends on what you got laying around ... Got a long action and a bunch of 06 brass. Then the 6-06 would be fine
..short action laying about 243 would be a good fit.
These days you have to pick what you have access to..


......
Dave

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Only accurate rifles are interesting.