Have you loaded for this rifle before? Yes
Does a sized, but not loaded piece of brass do the same thing? Yes
Was the brass new, once fired, fired in your rifle, or fired in some other rifle? Once fired in my rifle
Have you checked your over all length of your loaded rounds? Yes, they are correct or even just under
Have you tried marking up a loaded round with a sharpie marker and chamber it to see where it's rubbing at? Yes it looks like the shoulder just slightly
Is this a factory stock rifle? Or has the barrel been swapped? Stock
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