Posted: 3/4/2016 5:52:36 PM EDT
| I have a load that I started using for 3 gun this last fall. 55 grn hornady FMJ over 25.3 grn of H335. 3 weeks ago it was shooting 1" or less at 100. today I took the same rifle out to run a few through and I cant hold better than 3" with the same loads. Chronograph 3 weeks ago showed 2925 FPS. The only thing that has changed is the outside temp. It is about 30 deg. warmer now. Could that be enough to cause the problem? |
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I have a load that I started using for 3 gun this last fall. 55 grn hornady FMJ over 25.3 grn of H335. 3 weeks ago it was shooting 1" or less at 100. today I took the same rifle out to run a few through and I cant hold better than 3" with the same loads. Chronograph 3 weeks ago showed 2925 FPS. The only thing that has changed is the outside temp. It is about 30 deg. warmer now. Could that be enough to cause the problem? It could, but generally wouldn't open up that much. What scope and mount are you using? |
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Explain, please. Do you clean your muzzle? I shoot a lot of 3 gun and have experienced sudden unexplained loss of accuracy as the OP relates. My muzzle device has about .200" of gap between the end of the barrel and the first baffle of the brake. No way to see the crown with the brake installed. Removing the brake let me see how much crap had built up there, cleaning it restored the accuracy to what I expect out of the barrel. .223 / CFE223 powder / Hornady 55gr FMJBT projectile. 
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In HP, there's 2 choices. Clean it after every match or two and risk nicking the crown, or leave it be. Most leave it be. I have two new-to-me service rifles and was told they were rebarreled within the last couple years and not shot much. They each have a cone of crud within the A2 flash hider (maybe from a fair amount of .22) and shoot just fine. I'm curious if the combo of ball powder and a muzzle brake is what affects precision. |