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Old December 22, 2018, 01:53 PM   #5
T. O'Heir
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Join Date: February 13, 2002
Location: Canada
Posts: 11,221
355 grains is 13/16 ounces or .8 ounces. I'd guess it'd be considered a 7/8 oz slug. 525 would be considered a 1 ounce slug. I think.
Shotgun manuals tending to use ounces vs grains for both shot and slugs. There should be data in your manual.
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