Stock crawling is not a technique but a function of how you are built. A short guy with a narrow chest and short neck might need extension rings. For the typical guy, the regular rings work just fine. Just happens that almost any factory dimensions, rifle or shotgun come "readily to eye" for me.
The position of turrets and distance between ocular and objective bells also play a part. I have a nice German 1" Zeiss (long before Conquests) that has long bells and won't work on a #1 with standard rings.
Compare the distance from the end of the buttstock to the ocular bell of the scope (as far back as you can mount it) on a Ruger 1A to any bolt action or lever action rifle. You will see that the Ruger requires you to mount the scope much further forward. I am not the only one with this complaint about scoping a 1A. Also, I am 6'5" with at least an average length neck.
