Hello everyone, I am semi new to archery and know next to nothing about buying arrows so I would like it if you could explain some stuff to me. I kinda know about grains and wight but want to know about spine stuff and so forth. I have only bought arrows once befor and it said somthing like 3050?? I would like to know what that # means. Maybe you guys( And gals) could help me out with what arrow wight I should get for a martin cheetah, 27.5 to 28 inch DL, at 50 to 60 lbs, I will be using it for hunting and some 3D now and again..... So all advice is apprecated!