14.5 Mws and blown primer with RL15

[Sincerd]

So I did the P/w 14.5 MWS barrel in 6.5 CM. Slapped into a mws upper then tuned it with a flatwire, a5 and Slash XH buffer, POF roller cam pin and BRT gas tube at .070. Extremely soft shooting for a large frame.

Then I loaded up some RL15 and 140gr amax. Top charge was pretty high at 42.7. Way over any listed max. Temperature was 39. Suppressed with OSS HXQD-762. All shot well besides the single blown primer. Everything after 42.0 showed cratered primers.

Top charge hit average of 2581 with SD of 14. Not something I would load or even shoot again but I was very impressed with the condition of the brass. Check it out.

 

[GUNNER10]

Interesting,

I have a bunch of IMR 4350 that I am going to mess around with when I finally get set some new dies. how was the accuracy for the sub 42 grain rounds.

 

[Sincerd]

Interesting,

I have a bunch of IMR 4350 that I am going to mess around with when I finally get set some new dies. how was the accuracy for the sub 42 grain rounds.

2 rounds was 42.7 at 2.750 and where I stopped.

 

[Simonsza1]

That is so far over for rl15!!!! My load with rl15 is 39.5 and it’s scooting. You need to back that down a lot in my opinion. But you do you.

 

[Sincerd]

That is so far over for rl15!!!! My load with rl15 is 39.5 and it’s scooting. You need to back that down a lot in my opinion. But you do you.

Yeah definitely. Just wanted to see how I could take it and never saw pressure other than primers. Figured id see ejector marks around 41. Think that speaks to how well the system is gassed. I've seen much worse with factory ammo. Pretty impressive.

 

[newguy2k3v2]

Yeah definitely. Just wanted to see how I could take it and never saw pressure other than primers. Figured id see ejector marks around 41. Think that speaks to how well the system is gassed. I've seen much worse with factory ammo. Pretty impressive.

The dual ejector bolts are deceiving when it comes to ejector swipe. I had one of the old single ejector bolts that gave me heavy swipes. Swapped a dual ejector bolt in that headspaced exactly the same and the swipes completely went away.