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The idea of the post was to ask if people used an average BC from Sierra Data or had another method when starting the validation.
cheers.

I have 2 boxes of 140gr Sierra TMKs and fuck all powder
don't really want to use most of them fucking about if I don't have to
Thanks for the replies
Validation is what I have always done.

YOU...

So those that load sierra longer range bullets, do you just average the published Bc for the various speeds for a start then shoot for validation?
or is there a better way?
Problem is of course...