I'm an old school reloader. I seat them until they drop into the barrel fully, called plunk test . Start with a few dummy rounds, no powder or primer . If they manually feed from magazine , into chamber and can be extracted ( if bullet jams into rifling, retracting slide might leave bullet in bore with spilled powder in the action) . Then we load some with powder and go shooting. Adjust seating depth and powder charge as needed...I call it fine tuning.
Keep a dummy to set seating dies next time. This eliminates all that pesky measuring . Us old reloaders are very low-tech. Reloading manuals didn't even list COL . I just looked at 1967 Hornady , 1970 and 1974 Speer and 1986 RCBS Cast Bullet Manual......not one has a COL listed.
The 2007 Speer and 2010 Hornady do show COL dimensions but by 2007 I had been reloading 40 years and didn't need it.
I started in 1967 and learned how to load with out measuring it.
Back in the day all we had was yardsticks , rulers and tape measures...not much good for measuring that COL stuff anyway .
I just remembered I have one of those tools to measure with. Wait , let me find it !
Found it , All three dummy rounds measured 1.051 !
Eureka ! I'm no longer low tech...1.051 COL , All this time and I had never measured them.
I would say 1.50 OAL as Lyman listed would be fine. I could seat mine .001 deeper and it would make no difference. Go with it !
Gary,
No Longer Too Low Tech.