I do not have an AR10 type rifle, but I do have extensive experience with the AR15 type rifles from years of high power rifle competitions.
As you describe the condition, I don't believe that you have an ammo problem. It sounds more like there is an issue with the bolt hold open latch. Have you had the bolt lock open with any magazines? If not, it sounds like the tab at the base of the lever is either worn or broken, and needs to be replaced. If it does work with some magazines, but not others, it sounds like the follower is your culprit ... needing to be either built up or replaced.
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Judge control not gun control!
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