SC
Forum Replies Created
-
AuthorPosts
-
SC
ParticipantYou need to do the “plunk” test. Some barrels have tighter chambers than others.
Take the barrel out of the pistol that you want to test. Hold the barrel, muzzle down, in your hand. Drop a loaded round into the barrel chamber then remove it. Does the loaded round come back out freely or stick a little? If it sticks, you probably need to seat the bullet deeper.
ParticipantTo 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.
Participant50 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?
Participant“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.
ParticipantMake sure your powder drops are consistent. Neck tension is also something that affects groups.
One thing at a time though. Shoot some factory loads with the bipod and use that as a baseline. Next try swapping primers and make sure the power charge is within .1 or .2 grains.
ParticipantMake sure your powder drops are consistent. Neck tension is also something that affects groups.
One thing at a time though. Shoot some factory loads with the bipod and use that as a baseline. Next try swapping primers and making sure the power charge is within .1 or .2 grains.
ParticipantA change in primers may help but I doubt it will shrink groups by half.
Have you measured velocities with a chronograph?
ParticipantAccuracy starts with a good barrel. How well will the gun shoot with factory ammo?
ParticipantThat seems short to me. I am using a 135 TC (truncated cone) from another brand and the OAL is 1.130. Thousands of them have been used in an HK P30, but I also use the same load in a G19 and a PCC AR which uses Glock mags.
Maybe try 1.100 or 1.120 and see how that works.
Participant@Sadie Woolman-Morgan
What kind of differences in accuracy have you observed in rifle loads? Is the difference in 100 yard groups or further out?ParticipantI don’t know what Jake would say, but I have tried the Lee FCD on the 69 3GH and it did not seem to make a difference.
ParticipantPost that Jake, the owner of RMR made-
Post in thread ‘RMR’S 69 grain .224 bullets.’ https://www.thehighroad.org/index.php?threads/rmrs-69-grain-224-bullets.926611/post-12801960
May 24, 2024 at 5:07 am in reply to: Best seating dies/seating stems for .224 75 grain bthp? #515101Participant+/- .003 is not going to matter much in most applications.
The variation could be because of a couple of things, not just the seating die. Bullet and neck tension variation, press tolerances, and compressed loads can affect seating consistency.
ParticipantMore testing shows that neck tension definitely helps. I’m currently at 2.260 OAL and 24 grains of TAC. Next I am going to try 24.5 grains.
ParticipantYes, it is on my batch as well. I’m currently working on load dev and will be shooting them tomorrow.
My last test groups were 1.5″ and .21″ They seem to be sensitive to neck tension. The .21 group was with more tension.
-
AuthorPosts