300BlkTalk

https://i.postimg.cc/3NBK4mFj/Screenshot-20221017-133834.png screen shot on pc https://i.postimg.cc/J018LtCs/Screenshot-20221017-133923.png My first introduction to subsonic was in an AR308. Won't cycle, but man it is accurate and quiet. Used a thermal scope for this little 3 shot group at 100 yard...

I wouldn't want to get hit by it, very cool. Was that a factory load? If not what did you load it with. Loaded with H4198. I had a seating depth test loaded up for that powder, but had since worked with N110 and N105. Much better with those 2, so we were just jacking around trying to get some more ...

https://photos.app.goo.gl/qRT4vN81dsEnzZRW8



Thought this was pretty neat. Shot at 50 yards. The picture is the one I shot and the video is the one my dad shot. Looks like pretty good performance.

https://photos.app.goo.gl/DFH4qJudnDYsjqd77


Got it working. It took one steel weight and a Delrin weight with the lightest JP spring.

Updates: https://i.postimg.cc/RFsbrD1D/Screenshot-20220903-123535.png 9 rounds at 60 yards. N105 7.9 gr. 2.15 col BTO 1.664 ES 21 SD 7 Average velocity 1053 fps Now about function. Some weird shit going on. I used JP SCS XS standard first, then switched to 2 steel weights, then one steel weight and ...

If you’re maxed out for overall length, I would minimize headspace. Make sure the cases are fully fire formed and only set the shoulder back .003”. Depending on your chamber, that will be around 1.075-1.080. Maybe even longer, measuring with a .350” diameter insert which is most common. Just checke...

dellet wrote: ↑

Mon Aug 22, 2022 11:01 am

If you have the room, move the bullet out on the 8.0 load .020”

I am currently at .008" off the lands. Still have some things to try, but in the grand scheme of things, I'm reduced to wondering how important is BHO?

Update: Loaded up 7.8 gr, 7.9 gr, and 8 gr. Installed Lightest spring 8 gr - 1042, 1057, 1045. Only loaded one round first to check BHO. Achieved it, but subsequent shots did not lock back. 7.8 gr - 1040, 1025, 1028. All cycled, no BHO. Tried 7.9 and replaced the one tungsten weight with another ste...

That’s why I keep a standard spring, and both a carbine. 2.7 oz and an H2 buffer around. Trouble shoot with the parts it was designed to work with. Then modify. The brace I'm using uses smaller components than normal. The JP SCS XS is another option they offer. I could go with their version of buff...

Loaded up 7.8 gr, 8 gr, 8.2 gr, and 8.4 gr. None of them had BHO. But they were close. 7.8 - 1025 8 - 1060 8.2 - 1088 8.4 - 1110 Going to try a lighter spring and possibly a steel weight to replace the tungsten one on the standard JP SCS XS. Which brings up the question. Is it best to just try the ...