I took a look. I see brass case PP for $1.12 per which is much better than the situation in June. Hornady Black has increased to $2+ so the competition isn't helping their prices.
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So what this data means is that in spite of the haters raging that 6.8SPC is "dead", it appears that more people buy and shoot it compared to the grendel?
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I would not at all use the current pricing of 6.8SPC and 6.5Grendel to infer anything about the volume of each cartridge sold. If the supply of both is the same, but the demand for one is greater than the other, then the one in higher demand will generally have a higher market price.