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Bullet BC question

Hey guys I bought some bullets on here awhile back and I'm looking to try them out to 800 yards. I'd like to have a drop sheet along that will get me in the ballpark. I have a nice ballistic calculator on my phone. My problem is that according to the lapua site the bullets I have don't exist. The are 7mm 170gr bullets with the same rebated boattail as the D46 bullet. I wondering what I should use as a bc to start with. I will obviously be recording my real world drop and drift but like to have a starting point when I get there.

The 185gr 30 cal D46 bullet has a similar bc to the 175gr matchkings in 30 cal. Would it be smart to use the bc for a 168gr 7mm matchkings?

If anybody can shed some light on this that would be great!
 
there is a way to calculate the bc, zero at 100, with no sight change and in no mirage, fire at 200 and/or 300, measure the drop, go from there
Bob
 

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