NAS3 5.56 Cases - Tikka 223 w/ 88 TMK

[NWBLKTAIL]

I used a buffing wheel on a dremel to smooth it out. Looks ok.

That’s the commercial fisherman in ya lol

 

[B_Reynolds_AK]

That’s the commercial fisherman in ya lol

 

[Schmo]

Spoke to Anthony at Shell Shock today. He explained that the cases are supposed to stretch .020" and then contract back in an "accordion" manner. This happens near the base of the case where the horizontal line is.
His take was that the excessive chamber headspace should not be an issue.

He went on to say that millions of cases are being used and often at over 100,000 psi.
His recommendation was to load even HOTTER than I was, to get the case to stretch more and fire form to the chamber fully.

Well.. ok. I dumped 27 and 28 grains (8% more than my max load) of N150 into two cases and loaded with 80 ELD-M's.
Based on my regular loads of 26.0 of N150 with the 80's from my 16" 223, 28.0 would be pushing them in the 3,000 fps range.

I fired both into a snowbank outside my house and this was the result:
Two more pierced primers and a damaged firing pin.

View attachment 1042703
View attachment 1042704

Well that’s a bummer. I do think your primers have thin cups though. John @ Blackarc only runs #41 primers in his alloy cases. CCI 450 probably be a good second choice. I’ve got both on hand for when I experiment

 

[B_Reynolds_AK]

Well that’s a bummer. I do think your primers have thin cups though. John @ Blackarc only runs #41 primers in his alloy cases. CCI 450 probably be a good second choice. I’ve got both on hand for when I experiment

I have some #41's coming that @KyleR1985 put in an order of 88 TMK's for free. I'll give it another go and see what happens when they arrive.

 

[omicron1792]

I don’t reload but I have used several 100 Nas3 77TMK from phantom defense. About 2850 from 18”. None of the issues you are having.

 

[B_Reynolds_AK]

I don’t reload but I have used several 100 Nas3 77TMK from phantom defense. About 2850 from 18”. None of the issues you are having.

That’s good. I picked up some Lever to try undead of N150 and just grabbed those #41 primers. Wish me luck.

 

[omicron1792]

That’s good. I picked up some Lever to try undead of N150 and just grabbed those #41 primers. Wish me luck.

I’m pulling for you. I really want this tech to take off