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These are both designations for the 8mm Mauser cartridge. 8.2 x 57 was first used by Sako to distinguish between cartridges containing the larger .323" bullet from those with a .318" bullet. This had been the source of confusion for over a century. The designation is seen primarily in Scandanavian made rifles. The term 8mm Mauser is commonly used in the USA and elsewhere. I have also heard an unverified anecdote that the 8.2 designation was originally adopted by Sako because the Finnish game laws required a caliber larger than 8mm for moose. The .323 bullet of the 8mm Mauser cartridge is actually 8.2mm, so that's what Sako stamped on the barrels, making it legal for moose.

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Q: What is the difference between a 8 x 57 and 8.2 x 57?
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