This is a pic of my latest .308 Win. load. The Moderator said to post it here. I was trying to duplicate a U.S. GI .30 Cal. M80 Ball load. The cannelure seems to be in the wrong place! I used 05 FC US GI brass, a Hornady 150 .308 FMJBT bullet, an S&B large rifle primer and 46 gr. of Hodgdon BLC2. The problem is that the factory cannelure from Hornady is too far forward. I didn't have this problem with the GI M80 bullets. Problem is I used them all up! If I push the bullet in farther so the cannelure is flush with the case mouth isn't that going to increase my chamber pressure radically? I did put a crimp on these loads. Any comments?

That groove in the bullet doesn't mean diddly squat. Seat the bullets to the correct AOL and shoot them. The only time I set seating depth to a bullet groove is when I am loading cast bullets in a revolver cartridge, and then I line the groove up with the case mouth so that I can crimp into it for bullet retention under recoil. I have a funny looking cartridge laying on my reload bench. It is a 264Win loaded with a 160 grain round nose bullet and the groove is a full 1/4" ahead of the case mouth and that is where they were .010" off the rifling lands. They shot very good from a custom barrel on a TC Encore I had.

Ignore the crimping groove unless you're loading something in a tubular magazine (like a 30-30) and you have to crimp the bullet in place.

I'm loading said bullet for my .30-06 milsurp 1903A3 and do not care for the crimping groove, seating to the (longer) COL which gives the best accuracy within magazine length limitation. BTW, my seating depth looks like shown in your photo but I don't crimp (like for all my rifles handloads, BTW)

Compressed powder charges DO NOT increase chamber pressure. So, seating the bullet deeper should pose no problem.
What I am confused about is how you have determined the COL at that length for that bullet. If you have used a different type of bullet, the ogive shape will be different, this is why it seated to a different point. Each bullet needs to be adjusted, and even new boxes of the SAME bullet can, and do change between lots.
If you wish to seat to the cannelure, just do so.
I do not see the need to crimp, even with my 375 Weatherby in a bolt gun.

Cheers.