6mm 66 grain Cheek Niemi 8 ogive

[snert]

Planning on using these for shooting longer range woodchucks and wondered if anyone would hazard a guess on a BC. Shots to be up to 500 yards or so.

 

[JRS]

.24 - .25

 

[Dusty Stevens]

Ill guess .320
Gotta test em to be sure

 

[dmoran]

Chronograph them and establish a good 100yd Zero.
Then shoot them at multiple longer distances and record the "Come Ups" it takes to those distances.
Then with ballistic software, enter all your parameters and adjust the BC to match each of those distances Come Ups, and you will have the "true BC" average for your barrel and load.
Donovan

 

[snert]

Thanks...I needed a starting point for testing over distance and with the software. The groundhogs will tell. If the tail is flippin, the bullet is rippin