08-25-2021, 01:33 AM
At near sea level a 20" barrel is still not long enough to make a warm 107 SMK supersonic enough to trigger a ShotMarker target. I was hitting the target, but it was just too slow to activate the supersonic required system to work.
For gongs, and if you don't care if subsonic at impact, you can go quite a bit shorter. Just be aware you'll be going through transition, as Klem mentions. For gongs, you may not even notice it, if they are big enough. The 1000 yard bullseye match I did was an eye-opener. A 6.5 Creedmoor shoots great, without really even trying that hard. But the 6.5 Grendel that I was sure would score also well, didn't even get out of the gate.
For gongs, and if you don't care if subsonic at impact, you can go quite a bit shorter. Just be aware you'll be going through transition, as Klem mentions. For gongs, you may not even notice it, if they are big enough. The 1000 yard bullseye match I did was an eye-opener. A 6.5 Creedmoor shoots great, without really even trying that hard. But the 6.5 Grendel that I was sure would score also well, didn't even get out of the gate.