ULUL Stainless/Portless 6x45 16" AR15 Barrel Group Buy NOW CLOSED

[robtattoo]

Can you measure the necks on your fired rounds?

I chased a satern 6x45 chamber with a brand new reamer on my handi stub(which is going to shoot lights out based on early results), and I’m getting .269” on fired neck OD. I’m assuming we cleaned up the entire length of the neck as we had to cut the back of barrel off.

It confirms for me that the “barrel” from satern is good.

I’m curious to see what you have for chamber neck dimension. My reamer print shows .270” for chamber dimension of neck.

My neck diameter is about the same as Jesse's .258 for fresh, sized brass & between .2745 - .2750 in once fired brass (although, now I think about it, I didn't clean those necks before measuring)
Would soot make up 0.005"?

 

[KyleR1985]

My neck diameter is about the same as Jesse's .258 for fresh, sized brass & between .2745 - .2750 in once fired brass (although, now I think about it, I didn't clean those necks before measuring)
Would soot make up 0.005"?

The ones I just measured that went through the handi were .269” not cleaned.

 

[ezwy]

Has anyone shot their barrels? I haven't grouped mine; just sighted it in. I heard from one member who was having a hard time getting his to group - would like any other feedback you all have.

Also, anyone measure freebore?

I find they can be a little finicky. I had put a suppressor on it while hunting and shot it a couple times to re zero. Wasn’t real confident with point of impact so I pulled it out today (and put a different suppressor on it) and shot to sight in and verify accuracy. It seems to like this suppressor better.
2.28 COAL 87 gr v max with 24.2 grains of TAC. Pretty good quick 5 round group.

Will stick with this load til the bottle is gone.

 

[robtattoo]

I find they can be a little finicky. I had put a suppressor on it while hunting and shot it a couple times to re zero. Wasn’t real confident with point of impact so I pulled it out today (and put a different suppressor on it) and shot to sight in and verify accuracy. It seems to like this suppressor better.
2.28 COAL 87 gr v max with 24.2 grains of TAC. Pretty good quick 5 round group.

Will stick with this load til the bottle is gone.

Any idea of your velocity? 24.5 was barely getting me 2450fps......

 

[robtattoo]

Well, I had an old gent I contacted thru a local forum come & help me out with a chamber casting this evening. Sorry, I didn't think to take photos.
I blocked off the barrel extension with clay, leaving easy access to the chamber (he agreed that it was a worthwhile idea) & let him take care of the barrel heating & casting. Left it 15 minutes to set, punched out the cast & left it another 45 minutes to get to the correct dimensions & i gave him the SAAMI specs to compare to.

Good new/bad news:

The chamber is exactly to spec. PHUQ!

That means there's something really screwy going on with my brass. He re-measured 30 different fired cases & I wasn't wrong. Lots of body stretch, lots of neck expansion. Headspace measured perfectly at 3 thousandths.
I've been using commercial Remington .223 brass (which Andrew thinks is probably the problem) I've never used Rem for anything before, but he reckons it's very soft & generally stretches more than the hornady that he prefers.

I really don't know.

I do have a bunch of LC 5.56 that I'm going to try & I just ordered a couple of hundred, 80gr Sierra Blitz (which have good reports) & some CCI 450 primers.

I'm going to try again...... I've never known a barrel be this picky, but it may just be that.

I did send an apology email to Satern, too.

Maybe I just need to reeeeally dial back my shot string timing, not something I've ever had to do before.

 

[ezwy]

Any idea of your velocity? 24.5 was barely getting me 2450fps......

According to my athlon about 2640. Starline once fired brass.

 

[KyleR1985]

Well, I had an old gent I contacted thru a local forum come & help me out with a chamber casting this evening. Sorry, I didn't think to take photos.
I blocked off the barrel extension with clay, leaving easy access to the chamber (he agreed that it was a worthwhile idea) & let him take care of the barrel heating & casting. Left it 15 minutes to set, punched out the cast & left it another 45 minutes to get to the correct dimensions & i gave him the SAAMI specs to compare to.

Good new/bad news:

The chamber is exactly to spec. PHUQ!

That means there's something really screwy going on with my brass. He re-measured 30 different fired cases & I wasn't wrong. Lots of body stretch, lots of neck expansion. Headspace measured perfectly at 3 thousandths.
I've been using commercial Remington .223 brass (which Andrew thinks is probably the problem) I've never used Rem for anything before, but he reckons it's very soft & generally stretches more than the hornady that he prefers.

I really don't know.

I do have a bunch of LC 5.56 that I'm going to try & I just ordered a couple of hundred, 80gr Sierra Blitz (which have good reports) & some CCI 450 primers.

I'm going to try again...... I've never known a barrel be this picky, but it may just be that.

I did send an apology email to Satern, too.

Maybe I just need to reeeeally dial back my shot string timing, not something I've ever had to do before.

What did the neck dimension of the chamber casting measure?

.270” is what it should be. I don’t see how you’re getting .275” fired neck measurements if your chamber neck is in spec.

@ezwy can you measure neck on fired rounds from your barrel?

 

[KyleR1985]

If anyone wants 95tmk’s shoot me a PM

Probably placing another order with Sierra if anyone is interested

 

[ezwy]

Probably placing another order with Sierra if anyone is interested

What are your speeds and COAL with the 95s? Have you shot any critters yet with them?

 

[KyleR1985]

What are your speeds and COAL with the 95s? Have you shot any critters yet with them?

I don’t have much 6x45 data with them yet. Only 6ARC and 6dasher. Two deer with them last year with arc gas gun impact velocity 2400-2500 both bang flops.

Handi stub (using satern barrel with fresh chamber) 19”:

LC brass, cci41, 2.515”, 23.7gr H335: 2550fps(sub moa 3 shot group)

LC brass, cci41, 2.5”, 24gr 8208xbr : 2630fps didn’t group this was just checking velo and pressure

The handi is going to be a 200 and in type gun. So I don’t care about velocity. Honestly, the 6x45 ULUL will be the same for me. But I will push limits for research purposes. I just have to find the time.

I’m all in on the 95tmk as a do it all bullet for my 6mm hunting needs. I have a stash of 87vmax if either 6x45 doesn’t like the 95’s. 108’s hammer in the dasher as well.

 

[robtattoo]

What did the neck dimension of the chamber casting measure?

.270” is what it should be. I don’t see how you’re getting .275” fired neck measurements if your chamber neck is in spec.

@ezwy can you measure neck on fired rounds from your barrel?

Exactly .270. All the chamber measurements matched up with the SAAMI reamer prints to within 0.001

All I can think, with the brass, it's that it's springing open on extraction.

I really, truly have no idea what's going on at this point. All I know for 100% certain, is that the chamber is spot on & I have oddly low velocities compared to book loads.

 

[KyleR1985]

Exactly .270. All the chamber measurements matched up with the SAAMI reamer prints to within 0.001

All I can think, with the brass, it's that it's springing open on extraction.

I really, truly have no idea what's going on at this point. All I know for 100% certain, is that the chamber is spot on & I have oddly low velocities compared to book loads.

That seems really odd. Hopefully the brass change settles it for you. But the result will still eat at me…

 

[ezwy]

Exactly .270. All the chamber measurements matched up with the SAAMI reamer prints to within 0.001

All I can think, with the brass, it's that it's springing open on extraction.

I really, truly have no idea what's going on at this point. All I know for 100% certain, is that the chamber is spot on & I have oddly low velocities compared to book loads.

Might want to check your bolt spec. We went through issues with an x caliber barrel. Sent it back, everything checked out. sent the bolt out of our solo in and x caliber said the bolt was out of spec. (rounds loaded to sami would not chamber and had lands marks) got a rubber city armory bolt from them spec'ed to that barrel and problems went away.....

 

[robtattoo]

Might want to check your bolt spec. We went through issues with an x caliber barrel. Sent it back, everything checked out. sent the bolt out of our solo in and x caliber said the bolt was out of spec. (rounds loaded to sami would not chamber and had lands marks) got a rubber city armory bolt from them spec'ed to that barrel and problems went away.....

Damn.
That's one of those things that I knew, but forgot I even went through the same thing when I built it as a Ham'r.

I'll order up another head.