Ultralight Ultralight Rifles

[Trackselk]

I may be way off but I think I can get 2900 fps with brass and 77 TMK bullets out of the AI when I get it back. I will be more than happy to share any info on the rifle as soon as I can get it shooting. If we shoot the cases you are talking about then you will have to ream your chamber to AI if they blow the shoulders out to fit chamber without splitting. We can have a phone conversation if you like to make sure I understand everything but I am for sure up to it

That sounds good about you testing the nas3, but let's do have a chat first so I know I'm not setting you up for disaster. I'm sure you're a more experienced reloader than myself, I just gotta verify that...

You can definitely get that speed with lever powder, as another guy in this thread did with the regular chamber, but that was heavy lift territory in a bolt gun, and there isn't much stopping the bcg from coming strait back threw your face on these strait pulls. I guess with a fast barrel 2900 might be safe (ai), and 2800 with a slow ai barrel. I'll be searing for a good node between 2750-2825 depending on pressure signs. I am running slightly heavier projectiles, that actually weigh about 79.5gr, and I haven't compared the bearing surface to the tmk's, but I need to. So, I might end up a bit slower than you all.

I tried the IMR4895 I had lying around and it was slow with my 62gr bullets. I wonder which IMR he tried?

 

[Trackselk]

It will be interesting for sure. Stand1 77TMKs apparently do/did about 2,750 out of a 16" so I would think 2,800 would be possible with an AI chamber. 2,900 at/under 5.56 pressures would really surprise me, but hopefully surprising is the case.

I don't actually know the amount of capacity increase with a 223 AI, but in quickload, adding 2 grains capacity over my LC 5.56 brass to the 223 AI file gives around 50 fps increase at similar pressures.

Regardless, 50 fps or 150 fps, I think the 223AI will be great in one of these.

Being that we can easily cram enough lever in a LC case to get (too hot danger 2900), I think it would be really efficient if we can load em once for fire forming, and yet that be the same end result. One ladder test, load and fire regardless if the case is already formed, as I've found where guys say the regular 223 factory rounds shoot well out of the ai. Maybe the formed flavor is more accurate, but would be a treat if we didn't need to waste components just to form them. The peak pressure will be the same...

 

[SEtoNWHunter]

I know the new BCA bolt actions have been mentioned here. Everyone please be aware that there is a concern over the safety of these. They seem to be able to fire with an unlocked bolt. BCA has not responded as far as I know and hopefully this issue is either misunderstood or there is a way to reliably prevent it. Anyhow, you can see details of the issue, which has been reproduced with primed brass

Discussion starts at post #42 on page 6.

BCA bolt action upper for $350? > AR Variants > AR15.COM

https://www.bearcreekarsenal.com/350-legend-18-parkerized-hb-1-16-twist-15-mlok-bas-upper.htmlOne reviewer commented that he bought the upper in 350 Legend and immediately swapped out the 350 barrel f

www.ar15.com

 

[Trackselk]

I know the new BCA bolt actions have been mentioned here. Everyone please be aware that there is a concern over the safety of these. They seem to be able to fire with an unlocked bolt. BCA has not responded as far as I know and hopefully this issue is either misunderstood or there is a way to reliably prevent it. Anyhow, you can see details of the issue, which has been reproduced with primed brass

Discussion starts at post #42 on page 6.

BCA bolt action upper for $350? > AR Variants > AR15.COM

https://www.bearcreekarsenal.com/350-legend-18-parkerized-hb-1-16-twist-15-mlok-bas-upper.htmlOne reviewer commented that he bought the upper in 350 Legend and immediately swapped out the 350 barrel f

www.ar15.com

I can definitely see how you could fire it if the bolt is forward and the trigger is touched, but I think it's OK for safe adults, about like an old glock

 

[Thegman]

I know the new BCA bolt actions have been mentioned here. Everyone please be aware that there is a concern over the safety of these. They seem to be able to fire with an unlocked bolt. BCA has not responded as far as I know and hopefully this issue is either misunderstood or there is a way to reliably prevent it. Anyhow, you can see details of the issue, which has been reproduced with primed brass

Discussion starts at post #42 on page 6.

BCA bolt action upper for $350? > AR Variants > AR15.COM

https://www.bearcreekarsenal.com/350-legend-18-parkerized-hb-1-16-twist-15-mlok-bas-upper.htmlOne reviewer commented that he bought the upper in 350 Legend and immediately swapped out the 350 barrel f

www.ar15.com

That was my concern with the design before I had one in hand, but saw pictures of the carrier with a straight cam pin channel. I thought they might have solved the issue somehow with carrier geometry blocking the trigger, but after receiving a couple of them noted that they had not (and I can't see a good way to address that with carrier geometry).

It would be possible to have the carrier cut so that it blocks the hammer from striking the FP until it's rotated down, but the problem is that once the hammer has been released, it would block the carrier from being rotated back up unless it was some sort of camming surface. Very difficult to put all that in 23 degrees of travel. Another problem with that idea is that it would be specific to the thickness of the hammer. A thin hammer like on a Wilson trigger would likely get past such a design.

My thoughts were that for a right handed shooter it's probably okay as the spring moves the carrier far enough back to block the hammer if it's out of battery. You'd have to have your right hand pushing on the bolt and something else pressing the trigger. For a left handed shooter, that would be a lot easier to envision.

 

[JBradley500]

For those of you looking to shave the last 1/2 oz and spend a fortune... Smoke Composites has you covered.

 

[C Bow]

That sounds good about you testing the nas3, but let's do have a chat first so I know I'm not setting you up for disaster. I'm sure you're a more experienced reloader than myself, I just gotta verify that...

You can definitely get that speed with lever powder, as another guy in this thread did with the regular chamber, but that was heavy lift territory in a bolt gun, and there isn't much stopping the bcg from coming strait back threw your face on these strait pulls. I guess with a fast barrel 2900 might be safe (ai), and 2800 with a slow ai barrel. I'll be searing for a good node between 2750-2825 depending on pressure signs. I am running slightly heavier projectiles, that actually weigh about 79.5gr, and I haven't compared the bearing surface to the tmk's, but I need to. So, I might end up a bit slower than you all.

I tried the IMR4895 I had lying around and it was slow with my 62gr bullets. I wonder which IMR he tried?

I think he told me IMR 8208 XBR I will see him Sat I hope and pick his brain I do know he said no signs of pressure. He also was shooting some Varget but I think it was a little slower I think if we are trying to form the cases we should seat bullets deep enough to stay off lands to keep pressure down. When I get barrel I will let you know how much throat it has .

 

[Trackselk]

I think he told me IMR 8208 XBR I will see him Sat I hope and pick his brain I do know he said no signs of pressure. He also was shooting some Varget but I think it was a little slower I think if we are trying to form the cases we should seat bullets deep enough to stay off lands to keep pressure down. When I get barrel I will let you know how much throat it has .

Sounds good, thanks. I think that powder was on my list of the best for speed. Got it from that YouTube guy...

 

[packgoatguy]

View attachment 856257View attachment 856258

For those of you looking to shave the last 1/2 oz and spend a fortune... Smoke Composites has you covered.

See post 2227 for a skeletonized weight of the Hogue 15degree at under 30 grams. Also the MDT Carbon grip is about 27.6 grams

 

[JBradley500]

Thanks. I had to go with this one to match my handguard and stock lol!