There should be a minimum length for the bullet grain/powder charge,some rounds if you set too deep can compress the powder charge resulting in higher pressures.If you set them right around there should be ok.If you state what caliber and bullet weight we can give more accurate info
COL is cartrige overall length, measured from the base to the tip of bullet. This is the length that was used when testing the various loads done by various mfg's in their respective loading manuals. Do NOT go shorter than this length or the cup pressure is going to go up in a hurry!
You might see a tiny bit shorter depending on your press, but .001-.003 shouldn't hurt a thing. Especially if you're not at max load.
A little longer will decrease pressure, but may not chamber correctly. You'll just have to check and see for your gun.
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