Think I learned something new or more of a realization turning into lots of questions. New bullets to try out. I was making some food for the AR. The speer bullets coal in the speer book is quite short compared to other bullets I have done in 55g. The trim length I do with casings and putting nosler btbt bullets on the canalure puts them .005-.008 back from coal. These speer bullets, no canalure but with crimp will work I know and is a whole topic but not what I am talking about. The 2.220 in the speer book made me stop loading cause of all the variables. They will shoot fine in the R700 BOLT. Here is what got me thinking though. If each bullet 55GRAIN has different length and ogive. Then ogive to base of thethe bullet length is different. Thereby affecting charge capacity which affects everything in conjunction with my measurement in a paticular rifle for ogive position to the lands and grooves. If this is affected than the void behind the base of the bullet and the powder charge is affected. So you can't just use the lands and grooves measurement or odrive number of a rifle for most bullets because they may not have a proper seating depth. This will only be answered by using the short coal speer gives or should I use my measurement to the lands to accurise the load? The powder charge is the same but I want to know and learn more. It seems you can get lucky just putting this match together. I just want to understand what the books I have don't get into. Thanks again to all you guys here.