Sorry I don't know because I didn't have my chrony with me on the day i was shooting work ups. I started at 65.5 and went up to 67.5 66.5 gave me the best accuracy. The next trip I had my chrony and averaged 3038. At 67.5 I didn't notice any pressure signs, but was happy with the accuracy of the 66.5 so that is where I stopped.

I haven't settled on a permanent load as of yet.