I am new to reloading and I purchased a used Dillon square deal progressive to reload 45 acp. Some of my questions and I hope you guys can answer are these, I am using Speer 45 TMJ SWC 185 grain .451" match bullets for reloading. My Lyman 48th edition has a listing for this type of bullet and calls for an overall length of 1.135" with a BC of .068. Now I think that is a little short. I picked up one of those small complete reloading manuals for the 45 ACP at sportsmans warehouse and for the same bullet it calls for an overall length of 1.275" with a BC of .090 (C.O.L. tested at) the Sectional density is the same at .130 for both So what gives. Are they both correct? It seems like a big difference to me. Also when setting up the last stage on my progressive, which is the stage which removes the bell and crimps the bullet, how much tolerance is one allowed. I see .4730 inches is what it is suppose to be but how much leeway does one have? Thanks and feel free to give any other advice you see fit to give.