Back in the day when I was testing our suppressors I found on a 223, a 30caliber suppressor required 6 baffles to have the equivalent sound reduction as a correct .223 caliber suppressor that normally comes with 4 baffles. A 6.5mm on a 223 wouldn't be as bad, and if you wanted better sound reduction you could always just buy another couple more 6.5mm baffles.
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