ULUL 223 Wylde and 6x45 portless barrel thread

[Trackselk]

By popular demand, I added 8-10" options to the poll. @hereinaz if this isn't helpful just let me know and I'll drop whatever options you want, just trying to make this side of the deal as easy as possible, as you're doing us all a huge favor!

 

[hereinaz]

I am good with more information, it’s not too complicated as you all are managing and working through preferences.

 

[packgoatguy]

Why not 6mmMAX as an option?

 

[Trackselk]

I'm not very up on SBR sizes, so just let me know if you want different 223 lengths. I based the 6x45 lengths off of memory from this thread, so I might have messed that up as well.

 

[hereinaz]

Why not 6mmMAX as an option?

Numbers?

 

[Taudisio]

Numbers?

According to another forum, you get about .6gr more powder and 75fps over the 6x45.

From the designer, instead of 5.56 brass, it is necked down 350 legend, so a rebated rim and more steps to form brass. They only pressure tested to 55k psi. They claim 5gr more water capacity over the 6x45 and coal of 2.30” and achieve 6arc performance.

The numbers I saw posted were regarding an 87gr Berger going 3010fps from a 24” barrel. I have an accurate load with the 87 vmax at 2690 from a 16” but I had it up to 2820 iirc when I saw pressure signs. So kind of a Granny Smith vs golden delicious comparison.

I would be slightly concerned with a sticky bolt, where I know (my sample of one) 6x45 doesn’t have an issue.

 

[North River]

223W, 16”, 1/2-28, SS.

 

[TheM1DoesMyTalking]

I'm in for a 16" 6x45.

An SBR length is interesting, but I'd prefer 12-12.5" over the 8-10" range in the poll.

 

[KyleR1985]

satern already has the reamer for 6mm max.

Probably better off asking them to make 50 pencil barrels, if you’re willing to gamble on the guys who came up with the cartridge having brass available.

I’m out on it, because I know the 6x45 will do anything I want to do in the ULUL. And if I need more, my gasser 16” 6ARC is sitting in the closet, throwing 95tmk’s at almost 2800fps.


If that company could show they have 10,000 pieces of brass on the shelf, and the capacity to turn out more quickly, I’d be interested in the short barrel 6mm max. It currently doesn’t have a niche for me.

 

[Thegman]

According to another forum, you get about .6gr more powder and 75fps over the 6x45.

From the designer, instead of 5.56 brass, it is necked down 350 legend, so a rebated rim and more steps to form brass. They only pressure tested to 55k psi. They claim 5gr more water capacity over the 6x45 and coal of 2.30” and achieve 6arc performance.

The numbers I saw posted were regarding an 87gr Berger going 3010fps from a 24” barrel. I have an accurate load with the 87 vmax at 2690 from a 16” but I had it up to 2820 iirc when I saw pressure signs. So kind of a Granny Smith vs golden delicious comparison.

I would be slightly concerned with a sticky bolt, where I know (my sample of one) 6x45 doesn’t have an issue.

I mocked up a 300-350L to compare to 300 HAM’R and there was more than 0.6 grains difference, but 5 grains would be very optimistic, I think.

The other advantage the 6mm MAX has is that more of its capacity is usable. The MAX case is shorter and shifts its capacity deeper in the case, compared to 6x45.

All said though, I agree, unless it can run at the same pressure as the 6x45 and provide a decent gain in velocity, and cases don't stick, it may not offer nearly enough to offset the 6x45 advantages of availabilty of brass, dies, chambers, etc.

 

[4090Sharps]

Why not 6mmMAX as an option?

I emailed the company last month asking them about barrel options and brass forming. One email address listed on their site bounced back, so I hit another. No bounceback, but no response.