AR-Stoner 6.5 Grendel barrel short chambered.

[explorecaves]

It sounds like your assuming you should be using the published OALs? Every rifle is different and you should use the OAL that you measure in your chamber for each pill not whats in the manuals.

Just for sake of the argument here, if it happened to be reamed short then by using the OAL for that chamber and the powder of the published loads could result in a potential for a compressed load at a substantially lower volume of powder.