The Hornady 300 is a highly efficient cartridge based on the 221 Remington case necked up to .308. Renowned as a subsonic cartridge for use with suppressed guns, the 300 Whisper from Hornady is available in both supersonic and subsonic loads. Compatible with guns chambered for the 300 AC Blackout, the 300 Whisper from Hornady is a reliable performer with or without a suppressor and brings a new level of flexibility to the AR-15 platform.
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