krh625

Today I was finally able to get out to the range. I shot 3 shots with each of 140 gr factory, 140 gr MK and 140 gr RDF though a clean gun over my chrono. The only change that I make was installing a Strike AR10 flat wire spring. It had more recoil but the gas block did not need any adjusting. I put the original spring back in when I got home. I did measure the depth of the buffer tube and it is correct. Here are the pictures. Federal Premium 140 gr Sierra Game King Avg velocity 2740 fps with chrono set 10 ft from muzzle. Reload with 45.4 gr RL22 and 140 gr Sierra Match King Avg Velocity 2810 fps Reload with 45.4 gr RL22 and 140 gr Nosler RDF Avg Velocity 2710 fps The picture of the bolt face is after the 9 shots.

Thanks for letting me the know the information that I need to post for more help. As I mentioned I am running a 9 oz AR Stoner buffer with a AR Stoner LR 308 buffer spring in a rifle length buffer tube. Head spacing gauge is Clymer 1.630 Go and 1.634 No Go. I know the R22 hand load is hot. Looking through my data I am getting 2750 psi with the RDF bullet and breaking 2800 fps with a 140 gr MatchKing. My goal is the get teh gun setup so I don't ruin the factory brass. A t this time I don't have any pictures of primers or bolt face . I started to reload the factory brass after I switched the buffer and spring to see if that helped. It did help some since the bolt face doesn't have a ring of material from the outside of the primer on it now. I had to readjust my gas block so that could have cause some pressure issues until it was set. Currently It is only 1.25 turns open. Hopefully I will get out this weekend and will be able to take more pictures. I have attached pictures of the gas tube length which is short. Thanks

I am new to the forum and hit a road block with my new build. I have searched the internet extensively and read several threads but none seem to address my current issue. I built a AR-308 in a 260 Rem. The issue I am having is that I loose about 25% of my factory brass to swelled primer pockets and the others last one reload. I have 2-300 rounds through the gun. I didn't notice this issue with I first started to break in the barrel and initial load development. Its is configured as such - Aero Precision M5 Receivers Brownell BCG and bolt with small firing pin Wilson Combat 24 inch barrel with rifle length gas system Wilson Combat M2 - 2 stage trigger Superlative adjustable gas block Stoner 9 oz buffer (Recently replace 5.4 oz buffer) Factory loads are Federal Premium 140 gr Trophy Bonded Bear Claws (Factory Seconds) I have a bolt action 260 Rem and the factory ammo shows no signs of pressure. I checked the head space when the gun was assemble and re-checked recently. I had read that it could be from bolt starting to open too soon and that is why I put in the heavier buffer. Last weekend I shot it to adjust the gas block for the heavier buffer. Pressure signs on the brass weren't as noticeable with hardly any ejector mark. The brass I lost could have been from when I was adjusting the block. Once it was set I shot 3 - 3 shot groups with my hand loads and tossed all 9 brass. The hand load is 45.4 gr R22 with 140 gr Nosler RDF. This load is on the higher end for R22 but I didn't have any issues during the load development. Any thoughts or suggestions would be very helpful. Thanks