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OK. So after probably close to four months of anxiety, reading, laziness, 'it's too hot outside to work on the bench' isms after getting my Dillon 650 I finally sat down and worked all the kinks out and got my first 20 bullets of .223 loaded with 8208 XBR. I started with X-Treme Bullets 55 Grain FMJ and based on the limited data http://www.hodgdonreloading.com/data/rifle?&CartridgeName=223+Remington&OrderBW%5B%5D=55&Manufacturer%5B%5D=All&Powder%5B%5D=IMR+8208+XBR had I started with the lowest number of 21.5 Grains. I only managed to crush one .223 brass while setting up the dies (the crimp die oops) and with no primer explosions even though I put them in upside down (sigh) and had to take it all apart to get them out of there I finally got the rounds loaded and looking good on everything I could measure with. I took them out to the range yesterday and fired them through my chrono. I accomplished the three important things. They Didn't Explode, I didn't shoot my Chrono (it was at 25 yards) and I didn't shoot the light stand I bought for my camera gear that cost more than the chrono. This is the data I got. My question is, other than 'knowing' from other sources that I should use more powder, is there some kind of math you would do to decide what grain to go to next to get up to the 2700 FPS range? I have the Lyman manual and the 'ABC's of Reloading' book and I read those once but I don't remember seeing that. Is it trial and error? if so, what's a decent number to increase your load by ? I checked all the fired brass and they looked no different from the production brass I also fired after for comparison. The primers were dented and not blown back flat, there was no splits/cracks on the re-fired brass. My brass was once fired by me in the same rifle and picked up and cleaned & re-used. Thanks for any comments.