For a newbie such as myself can you describe what the "rankings" are, to me they sound like bullet sizes/casings? Apologies if that's not the right terminology.
Certainly, the rankings are displayed below your user name. They are here to help members know how many posts others have made on the forum. Once you get to 10 posts you will see a .22LR below your RayRay name when you post. Hope that helps.
They are different forms of ammunition and are ranked in size/power order. For instance the .22LR is very small cheap ammo used in a wide variety of guns while the .50 BMG is a rather large and specialized ammo.