My 3 barrels like a 40 Thou plus jump as well.
The Hornady OAL Gauge works well, if you have access to one.
In the case of the .222 the case actually ramps off the shoulder and if the projectile is seated too long it butts in to the chamber face before it has ramped up enough to get into the chamber. I found this with the 52Gn A-Max.
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