L.E. Wilson 300 AAC Blackout Brass Minimum Chamber Gage

The L.E. Wilson 300 AAC Blackout Brass Minimum Chamber Gage (part no. MDG-300B) is a go/no-go style gauge from L.E. Wilson that checks full-length sized 300 AAC Blackout brass against SAAMI minimum chamber dimensions, confirming cases have been sized enough to chamber reliably even in a tight match chamber. Handloaders use it on the bench after full-length sizing or trimming to confirm 300 AAC Blackout brass is within safe, reliable dimensions before loading and firing. It’s a straightforward quality check that catches undersized or oversized cases before they cause a chambering problem at the range or in competition.

Key Specifications

• Checks 300 AAC Blackout brass dimensions against SAAMI reference specifications.
• Functions as a go/no-go gauge, checks sized brass against SAAMI minimum chamber dimensions.
• Machined body is steel construction.
• Built for bench use after sizing or case trimming, before loading.

Frequently Asked Questions

What does this gauge check? It checks 300 AAC Blackout brass against SAAMI reference dimensions to confirm sized or trimmed cases will chamber safely.

When should I use it in my reloading process? After full-length sizing or trimming, before seating bullets, to catch out-of-spec brass at the bench instead of at the range.

Buy the L.E. Wilson 300 AAC Blackout Brass Minimum Chamber Gage

Order the L.E. Wilson 300 AAC Blackout Brass Minimum Chamber Gage from Schaefer Defense’s case prep tools selection. Our Lubbock, Texas gun shop ships fast, so serious handloaders can keep their reloading bench stocked with the exact tooling their process calls for.