NAS3 5.56 Cases - Tikka 223 w/ 88 TMK

[Scooby-93]

I saw an 88 disappear in a cloud of smoke today

22 creedmoor and 7twist?

 

[Formidilosus]

I saw an 88 disappear in a cloud of smoke today

You saw an 88gr TMK come apart in the air?

 

[Castle Rock]

22 creedmoor and 7twist?

Yes, creed but a 7.5 twist at about 3150

You saw an 88gr TMK come apart in the air?

No, 88 ELDM

 

[Formidilosus]

Yes, creed but a 7.5 twist at about 3150

No, 88 ELDM

What does that have to do with a 223 and 88gr TMK thread?

 

[Castle Rock]

This whole thread is about loading 88 grain bullets last I looked.

What does that have to do with a 223 and 88gr TMK thread?

 

[Formidilosus]

This whole thread is about loading 88 grain bullets last I looked.

No…? It’s specifically about TMK’s; it’s in the title. That’s why I was confused, and the guy after your post asked about the cartridge and twist- people thought you meant that you saw a TMK come apart.

88gr ELD-M’s coming apart randomly is nothing new- TMK’s don’t do that.

 

[Mike D Texas]

Is that case length or using a comparator for the shoulder measurement?

SAC comparator to shoulder datum.


Sent from my iPad using Tapatalk Pro

 

[Trackselk]

These NAS3 cases are strange birds. I messed with them about a year ago, and several of us running strait pull AR's had extraction issues with very light loads. So, I'm guessing they run them small so they cycle well in gassed AR's. My next experiment is trying them in my now 223ai chamber (still a no-gas strait-pull AR). They have a light crush fit, so no headspace issues, and I'm hoping that as the cases expand to the ai chamber, that they'll actually leave enough space to extract easily, however unlikely. If it actually works out I might have a very fast 223ai. FWIW

 

[Gstew1930]

https://www.alphamunitions.com/product/223-remington-267734?utm_source=ActiveCampaign&utm_medium=email&utm_content=223%20Remington%20Brass%20Now%20Available&utm_campaign=223%20Remington%20Brass%20now%20available

This is might be the best route for higher pressure. Their other cases handle it really well

 

[Ckat]

No, I’m done with it. My regular 223 88 TMK load is a 700 yard capable gun. No need to mess round more.

@B_Reynolds_AK, if you are still interested in gaining a little speed with what you’ve got, you might try LVR in your regular brass. 25.5gr gets me to 2830fps out of a 19” Tikka factory barrel with the 77s. It is a little temperature sensitive over about 90*, but would probably be fine up in your weather. Just a thought…

 

[B_Reynolds_AK]

@B_Reynolds_AK, if you are still interested in gaining a little speed with what you’ve got, you might try LVR in your regular brass. 25.5gr gets me to 2830fps out of a 19” Tikka factory barrel with the 77s. It is a little temperature sensitive over about 90*, but would probably be fine up in your weather. Just a thought…

Already on it.

Starline 5.56 brass
CCI 450
25.5 Lever
88 TMK
2.52 oal

2713 fps
16” bbl
1/7

 

[Trackselk]

Already on it.

Starline 5.56 brass
CCI 450
25.5 Lever
88 TMK
2.52 oal

2713 fps
16” bbl
1/7

Doesn't LC brass have more capacity? That's what a lot of us make our screamers out of

 

[B_Reynolds_AK]

Doesn't LC brass have more capacity? That's what a lot of us make our screamers out of

Maybe. I’m loaded out so long though, I’m not compressing the powder at all and I’m pretty sure I’m quite warm already!

 

[Ckat]

Already on it.

Starline 5.56 brass
CCI 450
25.5 Lever
88 TMK
2.52 oal

2713 fps
16” bbl
1/7

That’s pretty impressive. Makes it hard to want to burn 60% more powder to gain 300-ish FPS (10-11%) — e.g., 22CM, 22-250, etc. That’s a killer setup.

 

[KyleR1985]

I could be wrong. But my experience with the LC brass and Lever has been pretty eye opening.

I can only speak to the 77’s in a .223, but I had them at 2850fps in 16” barrel at moa ish for 10 shots. Primers seated fine for a subsequent firing on same brass. I haven’t shot them a third time because it’s my wife rifle and stopped messing with it. But 3 firings for .15c brass and that type of speed adds up for me. I got heavy bolt lift at 27gr / 2900fps with lever in that gun.

With my 223ai, Im 100% confident in sending the 88tmks at 2750 minimum from 16” barrel. There’s a good chance it’s 2800+. I just haven’t had the chance yet to shoot with lever this summer in heat to verify how hard I can push. But with formed 223ai LC brass and 27gr lever 2.5” OAL .090” off lands, 80* ambient temps in the shade, I shot this group of 3 for 2810 fps average. That brass has been reloaded and ready to fire. The extra grain plus of capacity makes a big difference in these small cartridges.