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See where factory rounds headspace on your gun and replicate that length.
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. . . ^ This won't necessarily do it. Usually, factory rounds are a bit short and they are headspacing on the case mouth - not by the bullet touching the lands and grooves. Most factory ammo has a gap between the bullet, and the lands and grooves. Although this usually results in proper firing ammo, it is not ideal. That gap causes the bullet to "wiggle" when it first starts its journey down the barrel. That wiggle is a potential source for inaccuracy.
When the bullet is sitting on the lands and grooves, there's no room for wiggle; resulting in a more accurate round. And this is why you want to plunk test for every bullet profile you load. The entire process only takes about 10 to 15 minutes, and need only be done once per bullet profile. Time very well spent. If you're loading your own ammo, might as well take the extra moment to truly make it
your ammo.