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Paul, this magazine should work properly with .300 Blackout. Here is a description directly from X Products' website: "Fits most M16/AR-15 rifles, Bushmaster ACR, SCAR 16 and Stanag rifles with improved M4 feed ramps. Variants of this versatile magazine work in 5.56×45/.223 and some 300 AAC Blackout *. May require modification to work in Robinson Arms XCR. Will not work in IMI Tavor and many Noveske receivers. No tools necessary to load or operate. Manufactured in the USA. Enjoy our no hassle lifetime warranty. If you have a problem we pay for the shipping, repair or replacement. If you aren't satisfied, send the product back for a full refund. * 300 AAC Blackout with 208 gr bullets will work. 220 gr will work but causes added stress on the internals. Soft Point and hollow point munitions are not recommended for use with the drum."

Paul, for safety and warranty reasons, I would confirm this with the manufacturer of this drum (X-Products) at 928.852.0078 or by email submission here : https://www.xproducts.com/contact-x-products/