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Weird, on JBM Ballistics they have a 155gr TMK and a 168 TMK ?

If you select the (Litz) projectile from their library and look on the result page, it lists the relevant BC

Nope sorry, TMK's came out after my book was published.

G7 0.229 G1 0.447

Use G7, it should be a better match for that shape projectile

That's from 2nd Edition of Applied Ballistics, someone else may have a later version to confirm recent values.

Brian Litz has an excellent chapter on this topic in one of his books - well worth reading.

He basically says change the variable that you have the least faith in.

There is a fair amount of...