6.8 SPC Forums banner
Cancel
Create thread New Forums

130 grain bullet form 6.8spc AR

Jump to Latest
33K views 33 replies 22 participants last post by  Ruffus James  
#32 ·
Speer revises 130 BTSP G1

Xman said:
Speer 130 BTSP is one of the 130 grain bullets that did perform well in the 6.8mm. Speer is optimistic on this bullet's BC. Advertised BC is 0.449 (G1). Measured BC is 0.360 (G1) in a 1:11.25 twist common to the 6.8mm. Most of the BC advertised for Speer bullets tested were 20 to 25% optimistic.

https://68forums.com/forums/showthread.php?96186-Ballistic-Coefficient-Testing-and-Analysis

Trajectory drop for the 130 grain bullets becomes noticeable beyond 200 yards and significant after 250.
Click to expand...
I think Speer finally revised their G1 coefficient. It is now .412

https://www.speer-ammo.com/bullets/rifle-bullets/boat-tail-rifle-bullets/277/277-130-bt-sp-bullet

So they must have retested!
 
You have insufficient privileges to reply here.
6.8 SPC Forums
posts
882K
members
41K
Since
2007
A forum community dedicated to 6.8 SPC firearm owners and enthusiasts. Come join the discussion about optics, hunting, gunsmithing, styles, reviews, accessories, classifieds, and more!
Full Forum Listing
Explore Our Forums
6.8 mm Firearms Discussions 6.8 SPC Ammunition & Reloading General Discussions Hunting with the 6.8 mm General Long Gun Discussion