This has come up regularly on the reloading forum at Shotgun world. The concensus of opinion is that MEC calibrated the bars using soft shot, no antimony, which is the heaviest compared to high antimony which is lighter. Size of shot also plays into what the actual throw weight comes out. Their target bars are smaller yet in order to keep you under the required weight no matter what type shot you use. I have not found soft shot for sale for years so have no idea why they do this but the drill will fix it.
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