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\”Winchester FMJ 147 Gr gave a 1/2″ group with a 1″ flier\”
Does this mean two shots were close together and one was further out?
I would use more than 3 shots to determine group size if you are going to consider flyers. Your sample size is just two small to get a conclusion. I shoot two 5 shot groups, allowing the barrel to cool in between.
Today the wind was blowing about 15 MPH opposing my shots exactly, or blowing right at me from the targets. I fired two 5-round groups of Winchester 147 Gr FMJ, and Browning 124 Gr RN FMJ from 55 yards. The Winchesters made a 5 inch group, and the Browning made a 2 1/2\” group. I now think the problem is my Anderson barrel, or possibly my BCG.
50 yards? At 50 yards, a varying 15 mph left or right wind can move the 124 grain bullet about an inch. A head or tailwind is not going to do much.
My experience is that the more I pay for a barrel, the better they shoot. You could try and troubleshoot your current barrel or move on to something with a good reputation. A really good bore cleaner is where I would start. I like foaming Wipe Out or Birchwood Casey bore cleaner. Let them soak to do their thing. When the patches stop coming out blue, you should be good to go.
Another thing is to check the fit between the barrel and upper receiver. Remove the barrel from the upper, then check to see if there is play between the upper and the barrel extension. I have used a thin amount of JB Weld , some like Loctite 620, on the extension and re-torqued the barrel nut. Let it sit a day or two before shooting.
Are you using a suppressor or a muzzle device, etc?
With a 15-20 mph headwind, I would expect maybe 1/2\” deviation at 50 yards, but maybe more likely 1/16\”.
I am searching for my tool right now, so I will figure out if the barrel is properly mounted first. Last night I took my BCG apart and cleaned everything with some quickshot. After that I oiled the critical points with good old Hoppe\’s gun oil. I also scrubbed my bore with a stainless steel tornado brush dipped in bench-rest copper solvent. I emptied two 5 round mags with no stove-piping.
Off and on I have been searching for my multi-tool, afterI find it, I will inspect the barrel mount and correct it. As per your suggestions, I will use a blue thread-locker and test again.
I have a basic muzzle break on it, and it is tight, I guess I should lock that on too.
Thanks for the tips.
To be clear, I am not saying to use a threadlocker on the barrel nut threads. Use a dab of grease for that.
The issue is if there is a small gap between upper receiver and the barrel extension. This will allow the barrel to move around inside the receiver. Adding a small amount of Loctite 602 or similar, to the outside of the extension, then putting it into the receiver, will act as a bedding compound. When it sets, the Loctite will harden, holding the barrel in place.
Similar to putting two pieces of pvc pipe together. You apply glue to the inside of the coupling and the outside of the pipe, then press them together.
I found this interesting wind chart:
It turns out 350 legend is very sensitive to wind drift. At 300 yards in a 10 MPH wind, the drift is 20.9\”, so at 50 yards it could be close to 3.5\”. Yesterday the wind was closer to 15 mph or more. The wind was opposing my shots completely which could cause a deflection in any direction, so I am not so sure this was a good test. Wednesday I will do the 5 shot groups again due to wind forecast.
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