To use it properly, i need ball coeff for 60gr Vmax, 69gr sierra and 55gr q3131a. Can anyone explain how i am supposed to know this, and what they are would be nice.I mistakenly have been putting caliber 223in that box,and luckily with a 50yd sight in ,i have had no problem holding dead on out to 250yds ,hitting the plates thinking i had used the ballistic chart correctly and thinking i new the correct bullet drop at the various distances.  

Hi Girard,

You can find most bc's on the manutacturers' websites:

60 VMAX = .256
55 FMJ  = .272
69 MK   = .301

[url]http://www.sierrabullets.com/bullets/index.cfm?fuseaction=Ballistic[/url]

[url]https://www.hornady.com/cgi-bin/web_store.cgi?page=bc.html&cart_id=1030724.042800[/url]

Greetings from Holland,
Bollocks

Bollocks,thanks very much.