For what its worth, I prefer my rifles to by about 3/8" shorter LOP than my shotguns.
One simple way to measure is to extend you trigger side arm parellel to the ground, and bend at the elbow so that your index finger is pointing straight up.
Grasp your rifle with that hand at the PG and return to that position so that your trigger finger rests comfortable on the trigger.
You should have slight clearance between the butt of the rifle and your biceps tendon at your elbow. No clearance or unable to make a 90� angle means LOP too long. A gap more than 1/2" is probably too short unless you plan heavy clothes.
This has worked very well for me. Shotguns I like them to just touch the bicep and rifles 3/8" shorter.
"The Democrat Party looks like Titanic survivors. Partying and celebrating one moment, and huddled in lifeboats freezing the next". Hatari 2017
"Hokey religions and ancient weapons are no match for a good blaster at your side, kid." Han Solo
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