Surprising Test Results: How do suppressors affect accuracy

April 6, 2022. Surprising Test Results: How do sound suppressors affect accuracy — How do they affect competition shooting? The answer is yes in some disciplines and venues where sound “moderators”, are allowed. The November issue of Shooting Sports USA eZine contains an interesting article on the use of sound suppressors, also known as “cans”. The article discusses the use and limitations of suppressors in North America and Europe. The article also explains the rules and regulations that govern suppressor ownership in the United States. Chip Lohman, Shooting Sports Editor, tests three rifles on the bench and finds that sound suppressors do not affect accuracy. All three rifles tested (one in.223 Rem, one in.308 Win and one each in.338 Lapua Magnum) shot slightly better 5-shot groups at 200 yard when a suppressor was fitted. The suppressors did not alter the point of impact. The velocity standard deviation (SD), values were significantly lower when suppressors were in place for all three test rifles. This observation requires further investigation. *CLICK HERE to read the Suppressor Article in Shooting Sports USA. It is possible that suppressors could be beneficial in competition. The current NRA rules in the USA prohibit the use sound suppressors. NRA Rule 3.16.1 subsection a states that “Sound suppressors are not permitted for use in High Power competition.” There are also practical issues with suppressors. The heat from a naked suppressor can cause mirage problems. That’s why some shooters cover their cans with a cover. However, suppressors are still commonly found on rifles used in tactical matches or PRS/NRL events. Many of the Steel Safari field challenge matches’ competitors use suppressors. Below is Zak Smith, our friend, competing in the Steel Safari field challenge match with his suppressed Accuracy international rifle. Commentary — What Can You Conclude?
This three-rifle SSUSA test was not conclusive. Different suppressors may produce different results depending on how they are fitted to different rifles. Mounting a suppressor on any barrel will definitely affect harmonics and “tune”. Mounting a suppressor to any barrel will certainly affect harmonics and “tune”. Ken Oehler, a chronograph maker, said that SD values should be reported. However, he did not draw any conclusions until he could do more testing with larger samples. “Qualifications to Get a Suppressor” To legally obtain a suppressor you will need to fill out Federal Forms. You will also need to pay $200 to the ATF. You must also pass background checks by BATFE and comply with all applicable Federal and State laws. You can have suppressor ownership and use regulated by the state. Be sure to check your local laws. The Federal Firearms Act of 1934 regulates the acquisition and use of suppressors.