love my barrel guage thingy.. (name escapes me sorry) if it sticks out, too long.. looks to short I make it longer. OAL confused the **** out of me when I first started reloading. It still confuses me but Ive learned to accept that and work inside what I have came to know as safe parameters. What I also have learned is the basics, rifles want the OAL for a good "jump." semi-auto handguns want it to cycle smoothly, revolvers need it to fit.. basics. all been said before. You can play around with the COAL and see what works best for you. Just remember to stay within the printed "safe" parameters, or wear iron gauntlets and face helm, every time you go shooting as a precaution.
good luck.

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sw9ve, 24/7 pro Ds, Hs M4