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280 AI weird groups??

My cleaning regime for several years has been between 100-150 rounds depending on the round. 708 & 308 make 150, the 280 is being cleaned at 100. I keep accurate records on loads and firings. Nylon brushes using Iosso paste, 4-5 push-pull sessions with 40-60 strokes each, cloth patches in between… without going into to much detail and turning this into a cleaning thread lol. Typically takes an hour.
Although Im going to try the carbon removal only method (leaving the lead) and see how that works.
I found over the years of you take the time to clean down to bare barrel, it will take 8-12 rounds to fowl it.
I carry a 3 minute game timer to the range and typically fire a round every 3-6 minutes to keep the barrel cool.
I'm fortunate and my range is 12 minutes from the house, I work from home and a lot of my load development sessions happen during the lunch hour lol.
After the consult from this board, I've stopped switching back and forth between jacked and monos. I'm currently shooting VLDs because I know those well.. basically takes jump guess work out. Set at .010 off jam and they shoot. I've had very good luck on numerous rifles with VLDs.
Thanks!
 
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