We have a dedicated 6mm / .243 version of the SPIRO. It is designed for 6ARC, but can also accomodate .243WIN and 6 Creedmoor (see minimum barrel lengths in table, opposite).
The 6MM version meters the following on 6 ARC (16" Geissele AR-15, Hornady TAP)
- Milspec (muzzle) 137.7 dBA; LEQ dBA 124.5
- Shooter's Ear 138.0 dBA; LEQ dBA 125.0.
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