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OAL tip to base is included in manuals to say this max load with this bullet was seated to this OAL when pressure was recorded. Looking at OAL alone, yes, it increases some as you shorten the OAL.
If you increase OAL until the lands are touched, that too increases pressure some.
Some is my way of saying 10 - 25% from what I read. Does it matter? Depends on rifle and load.
If you want to touch the lands, I never touch..., but sometimes shoot into +0.010" or shoot close to -0.010" to get best accuracy. I work up the load twice to determine OAL. First min load at many OAL, then best OAL and vary charge.
You can set OAL however you want, but I use the Hornady tools.
Benchrest is different because their actions and barrels can take case splitting pressure without much flex in the gun.
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