I have used AR2209 with 90gr Speer SP's, very accurate, as soon as I use AR2209 on 100gr, the groups opened up substantially, a mate a the range told me to use AR2213 (now AR2213SC), and it solved the problem, bullet seating and OAL were exactly the same, it seems the slower powder just works better. I have a KG of N165 that a mate uses in his 7mm Rem Mag, hence my questions here, can the N165 be used in the same way AR2213 has been used with the 100gr projectile. It has a similar burning rate.