Crow, chucks, and varmints...hummmm bullet needs to expand on impact.
If the varmints ain't a fly'en, I am not to interested.
Lots of bullets just zip right through a chuck and they just crawl or run off.
800 yards on varmints is not like 800 yards on a steel plate.
Yes, explosive hits from varmint bullets can matter more then burning extra gas to push the heavies. In 6MM try the 62gr Varmint Grenades, 70gr TNTs, and 87gr V-Max. The heaviest 6MM V-Max is the 87V-Max and it's awesome in the 243WIN. About good as it gets before leaving the mist for 105s.
The OP wants to build off of a 308 bolt face and might want to consider the 6XC with 87 V-Max and 105 A-Max. Brass is easy. Just open bag and load.
A long range varmint thumper I'm building later this year is a heavy chunk 7-08AI. (I have an 8 twist Rock 1.200" cylinder on order) Lots of 7MM varmint bullets too like the Sierra 100gr VHPs, Speer 110gr TNTs, Speer 115 VHPs, Hornady 120gr VHPs, Hornady 120gr V-Max. The 120 V-Max should be wild on squirrels. We gonna love 110 TNTs and 162 A-Max's. Also I'll see if it can push 175s with it's AI engine...This rig should shoot almost everything and with longer barrel life too.
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