Hi all, I have a 27,5“ (700 mm) Heym CPQ coated barrel and would like to shoot Lapua 180 gr Scenar-L put of my 7mm/.284 Win. The barrel has 8,7“ (220 mm) of twist.
I am currently using N160 and getting 2769 fps (844 m/s) wirh 52,1 grs. The powder is completely burnt in the barrel.
However, I also read many posts with recommendations for N165.The powder doesn’t seem to burn completely - purely mathematically - inside my 27,5“ barrel.What are your experiences with the two powders in shorter barrels?BestUwe