Barrel temps most likely not the case......every 3-5 shots I would go downrange to look at the targets. 10 min break each time.
I have a custom foam cheek piece that I made. I try to be consistent. I usually load each round separately. Is it better to load up the magazine and cycle through them without changing cheek position?
No anti cant device
.....the level bubble right?
The scope has a side focus for parallax. It has predefined settings for ranges. I try to fine tune it by finding the sweet spot. At 500 yards it seems that no matter what I do there is still some slight parallax.
With breathing I try to have the trigger brake on the bottom of my exhale. Do you recommend a different type of routine?
Do you think that the brass fired different amounts of times is most likely not the problem? I agree with you that all the other variables have to be perfect as well I was just curious if this had anything to do with it.
I have not played much with the 175gr bullets but I can try to make a few batches up with the Barnes Match Burners and see how they behave.