Re: New Loads: Powder Charge vs Seating Depth
"I've read that smaller COAL's lead to higher chamber pressures, so should I choose the 0.010 for my OCW loads? "
I suspect you read that about handgun loads and are misapplying it to rifles.
Starting LONG, at, or very near the lands increases start pressure in rifles. Seating deeper, within reason, decreases start pressure.
Yes, start close, find your charge. Then test seating deeper to tweak the load.