I loaded up a ladder for my rifle. Set my COAL at 3.34 and they wouldn't chamber! Grabbed a factory load and it cycled properly. Measured the factory load and it measured 3.185. I don't have the tool to measure the lands so I worked backwards until they chambered smoothly at 3.20 with no resistance and they shoot and cycle. When it was 3.225 it was snug closing the bolt. Once I felt resistance I backed it out. My son Remington cycles and groups great at a COAL of 3.335. Very perplexing. I know every gun is different.