Well, the 6.5CR & 7mm-08 were meant to be fired through the standard mag box/follower/spring setup. The 8.6BLK was not. You’ve zeroed in on the cause of the condition. The issue now is simply getting the mag to work.
Let me ask, what are you using to adjust the feed lips? If you are prying the lips with a screwdriver or bending them with standard pliers, this is part of the problem. It’s not very good adjusting the feed lips evenly that way. I recommend you have one of these tools below first. Also, it may be possible that more spring is needed. Or the follower may need to be shaped a bit different. Magazine adjustment & modification is an art form. LOL!
This is the correct tool. Magazine Feed Lip Adjusting Tool. There are many different available but this is a simple inexpensive option.
https://masterpiecearms.com/shop/mpa...justment-tool/
These also work. They are Sheet Metal Pliers.
https://www.amazon.com/IRWIN-VISE-GR...l%2C109&sr=1-2
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