So i just started reloading a few weeks ago. Started out with 223. Im using the Hornady 10th edition manual that came with my press bundle kit. Im following the loading data for powder that matches the bullets im loading but found that the factory rounds i have are not seated as deep as the book says they should be. Could be because of the factory powder being used vs what im using. Blc-2 for my 223. My book says for a 223 55g i need a C.O.L of 2.200, max is 2.260, my factory 223 round is 2.230. I figured that loading to the factory spec of 2.230 vs 2.200 would slightly decrease velocity since its not seated as deep, is that a correct asumption? I also trimmed them to 1.750 before seating like the book said, that also matched my factory round length as well. I loaded 10 rounds, went to the range. All went off without issue, cycled perfect, hit the paper at 100 yards. Wasnt testing for accuracy yet but more for function to make sure they worked. No signs of over pressure on the brass, cases looked perfect after firing. I didnt load to max velocity, started at the lower end and will work my way up. Does anyone with more experience see any issues with seating this way? Should i just follow the book and seat them the extra .030? Ive watched some videos and read forums, it seems everyone has their own preference on C.O.L. as long as its under max and at or above what the book lists for the bullet selected. Thank you.