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Pressure signs with low charges

Hello, new to the forum. Looking to get a more seasoned opinion on pressure signs seen in the pics, one batch of 6.5 CM's (Rem700) and a .223 Rem (Ruger American g1) batch. The colors around the primers are from colored Sharpie markers that I use to mark different charges within the lot of 50 rounds. I typically do 5 batches of 10 rounds for load development, with the cases on the left being the starting charges (per Hornady 12th edition) and working up to a step under max charge on the right. I'm curious as to why I'm seeing pressure signs with the low to mid charges (flat & cratered primers), and the signs don't seem to be consistent within the same charge weight.

6.5 cases have been fired 4 times, using CCI-BR2's and H-4350, starting at 35.6 gn, working up to 41.5 gn, pushing Hornady 140 ELD-Ms.

The 223 cases have been fired 3 times using CCI 400's and H335, starting at 22.3 gn, working up to 24.3 gn, pushing Hornady 52 BTHP-M.

Both are factory rifles minus stock swaps and are producing sub-MOA groups and decent chronograph data. I'm just wondering if I'm misreading the pressure signs and would like a second (or 50, lol) opinion.
 

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What is your barrel length on the 6.5mm, what is your seating depth on the bullets, how are you measuring your powder and with what? have you run this ammo over a CHRONY?
 

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