Come out and have your (legally owned) suppressor tested using standard suppressor testing procedures, with state of the art test equipment. One of our members is generously setting this up with his own equipment and has experience doing these tests. This is a rare opportunity.

This event is open to members and guests (normal guest rules apply).

When: Sunday, May 22, 2022,  10AM-2PM

Rain Date: Saturday, June 5, 2022 9AM-1PM

Location: Range 1

Registration: None - Show up and test your suppressor/host/ammo combo

Cost – Free

Match Director - Jim Pendergraft

Contact Stan Mahaffey @ tooling@nc.rr.com with questions.

Weather:

• Clear weather is required. Rain will ruin the microphones.
  
• We need low to moderate wind. >12 MPH is out of spec.

Ammo requirements:

• 20+ rounds per firearm/can combo. In a perfect world we only need 13 (3 unsuppressed, 10 suppressed), but things can go wrong so bring extra rounds for do-overs, etc.
• It’s good to meter common ammo types so people can compare results more directly. While you can shoot anything you want, here are some recommendations:
• • CCI Std Vel is a good choice for .22 LR. It’s widely available and commonly used for metering.
  • For centerfire pistol Winchester White Box is also widely available and commonly used for metering. Generic Federal is used a lot too.
  • For handloads the bullet weight and power are useful data points.
  • Supersonic rounds are loud in any case so brand doesn’t matter so much.

Metering protocol:

• Be prepared to provide your suppressor make and model, host firearm make and model, barrel length if it’s non-standard, caliber, and ammo type.
• We will follow MIL-Std-1474D, with one mic 1 meter to the left of the muzzle, 1.6 meters from the ground. We will also record left and right ear sound pressure levels so we’ll have three data points per shot.
• The meters are all Larson-Davis 800Bs, with B&K 4938 mics. These have extremely fast rise times to capture the peaks.
• While 30 shots are considered the minimum for most statistical purposes, experience has shown that 10 shots give similar results. 10 shots is also considerably faster and less expensive.
• When the data are all tabulated and checked the results will be made available to everyone for free, probably via a Google Docs spreadsheet.