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Linda, no Ma'am. This muzzle brake would work just fine on Calibers such as .308 Winchester, 6.5 Creedmoor, and .243 Winchester. Cheers

This is great for that caliber. As long as the threads are the same.

Linda, No it is not. It would work great. It does have the proper 5/8"-24 thread pitch for the American's threaded barrel. Here is a muzzle device that works great on my 6.5 CR bolt guns. Even though it is a 30 cal device it function great with the .264" diameter 6.5 round.-----------https://www.budsgunshop.com/product_info.php/products_id/98768/yhm+3085-mba+slant+muzzle+break+30cal