Test Rifle
Model: Howa 1500
Cal: .308 Win
Barrel Length: 22“
Ammunition: Magtec 150g FMJ Boattail
Test equipment.
Bruel&Kjær 3160-A4/2 amplifier attached to a specialisedBruel&Kjær
4941 Microphone and coupled to a laptop using PULSE Labshop version 13.5.0.32
Sofware
We have noted the first letter(s) of the manufacturer and thier country of origin
on all models of Moderator tested except our own models. We do not wish
to reveal more information about the exact manufacturer details and models than
this.
Test Results in order of performance. Best at the bottom, worst at the top
| Moderator | Peak Noise Level in dB | Sound Reduction in dB |
|---|---|---|
| Ohne / None Fitted | 161.0 | - |
| Delta I | 152 | 9 |
| Delta II | 144,4 | 16,6 |
| Delta III | 140,1 | 20,9 |
| WC / GB | 138,5 | 22,5 |
| B / CH | 135,5 | 25,5 |
| Theorie Test Model | 136,4 | 24,6 |
| J / DE | 135,4 | 25,6 |
| J-T / GB | 135,3 | 25,7 |
| A-T / NO | 135,1 | 25,9 |
| P / NZ | 134,8 | 26,2 |
| A-T / NO | 134,8 | 26,2 |
| SL / DK | 134,3 | 26,7 |
| AU / FI | 134,2 | 26,8 |
| AU / FI | 134,1 | 26,9 |
| Delta IV | 133,7 | 27,3 |
| B-M / GB | 133,7 | 27,3 |
| T R / FI | 133,6 | 27,4 |
| G T /USA | 132,1 | 28,9 |
| A-T / NO | 132,1 | 28,9 |
| AU / FI | 131,9 | 29,1 |
| Delta V | 131,2 | 29,8 |
| Delta VI | 131 | 30 |
| Delta VII | 129,4 | 31,6 |
We do not recomend using a Delta Moderator with less than 4 Baffles as this may not achieve the required reduction to safe levels.