Hi guys. Hoping someone can help me find the right bullet for my 1:9" twist 22-250. I use this gun strictly for paper punching (at 100, 200, 300, & 400yd matches). I've been using the Hornady 75gr AMAX bullets with mixed results. Is the Greenhill formula accurate/relevant? It shows that the optimum length for this twist would be 1.003". The 73gr Berger HPBT, 75gr Hornady HPBT, 77gr Sierra HPBT MK, & 77gr Nosler CC bullets are all under this length, while the Hornady 75gr AMAX is not. What are you guys using? Thanks!