You normally don't give any thing up by loading short, as you work up the load, except using less powder. When I machined the min spec chamber for my 223, I had existing ammo I wanted to use. During my setup the Sierra 69gr HPBT-M would chamber at max length and not get into the lands. Then I tried the 52 & 53 gr Serria Match bullets. Neither of those would chamber, or come close. The rim was setting high (0.050") in the case guage I made with the reamer and barrel drop off. But this was kind of expected since I picked a reamer that only had 0.025" lead, where the average is 0.055". I used a throating reamer to adj it to match my other rifle. So I did not have to keep the ammo specific to the gun. Now it did not take much to make them fit. But in doing so I made the jump longer on the heavier bullets. So it's a trade off. If your only going to shoot the heavy bullets, Pick 1 and set the chamber up for it. Doing this it may not shoot the lighter rounds as good. With a 1:9 twist barrel your max is going to be around 65-69gr. My 1:9 shoots anything well with 65gr SGK and lighter, but starts to opening up with the 69gr HPBT-M. My only requirement was to shoot the 65gr SGK as this was my varmint gun. Even the cheap Hornady 55gr FMJ-BT shoots 1 moa in this barrel.