The annoying Wylde Chamber explained:

[markm]

Just read an interesting post on AccurateShooter.com’s forums about the Wylde Chamber, and it sounds credible.

i see more bs on the wylde chamber on this forum.
it is a MATCH reamer to allow ACCURACY with 69.75 grain bullets for 200/300 yards in cmp/dcm ar15/m16 clones and STILL ALLOW AN 80GR SMK BE SINGLE LOADED. it is not the best all round chamber…it is designed for one thing and one thing only 600 yard 80gr single load with moa or less accuracy for 200.300 yd stages at cmp.dcm matches.
it is neither a 334 nor a 5.56…it is a wylde…call bill and ask him.

[titsonritz]

So what is 334, the Spinal Tap version of 223?

[markm]

Just a typo obviously, but I didn’t want to alter the actual post if I was quoting the guy.

Now I have to shoot 80s in my annoying ass Wylde Chamber to see what happens.

[sinister]

@markm

it is a MATCH reamer to allow ACCURACY with 69, 75 grain bullets for 200/300 yards in cmp/dcm ar15/m16 clones and STILL ALLOW AN 80GR SMK BE SINGLE LOADED. it is not the best all round chamber…it is designed for one thing and one thing only 600 yard 80gr single load with moa or less accuracy for 200.300 yd stages at cmp.dcm matches.
it is neither a 223 nor a 5.56…it is a wylde…call bill and ask him.

Correct.

Bill Wylde put his chamber and leade dimensions between .223 Match and 5.56mm. He was able to squeeze excellent precision from 62-grain Canadian 5.56mm military ammunition.

Frank White of Compass Lake has a rapid-fire reamer well-recognized for maximum precision with 69s and 77s. For 80-grain Sierras the seating depth is around 2.450 with a new barrel.

The USAMU uses Colt’s .mil 5.56mm reamer to long-load the 80-grain Sierra Match King at 2.500 inches – this allows for the long-taper bullet to get a running start at the rifling leade without a chamber pressure spike.

The Wylde chamber is tighter than the 5.56 chamber with shorter leade angle. Try seating an 80 SMK to 2.455 when new.

[markm]

This is cool info. The Wylde chamber feature is thrown around all the time, but I never knew the true idea behind it. We have a box of 80 that stays out on the bench in the desert.

[flenna]

@titsonritz

So what is 334, the Spinal Tap version of 223?

Ok, that made me laugh.

[SteveL]

Interesting. I knew it was in-between the .223 and 5.56 chamber dimensions, and that it is supposed to be more accurate, but I did not know it was designed for longer 80 gr projectiles.

[T2C]

@markm

Just a typo obviously, but I didn’t want to alter the actual post if I was quoting the guy.

Now I have to shoot 80s in my annoying ass Wylde Chamber to see what happens.

I see 1/2 MOA groups at 300 yards with regularity.

[HKGuns]

I’m not understanding why it is annoying?

Seems well thought out to me as a better middle ground between 223 and 556 NATO.

I have several barrels and have no issues with any of them.

[markm]

@T2C

I see 1/2 MOA groups at 300 yards with regularity.

I’ve never got my White Oak to get sub moa. But in fairness it’s an old complete upper built by those baffoons at ADCO. Their horrific pinning probably destroyed the barrel’s accuracy.

@HKGuns

I’m not understanding why it is annoying?

Seems well thought out to me as a better middle ground between 223 and 556 NATO.

I have several barrels and have no issues with any of them.

Many wylde chamber barrels (including mine) don’t play well with 5.56 pressure ammo. Popped primers, bulges, and swipes much more common.

[HKGuns]

@markm

Many wylde chamber barrels (including mine) don’t play well with 5.56 pressure ammo. Popped primers, bulges, and swipes much more common.

Got it, thanks. My reloads shoot just fine. I may try some of the crap XM193 I have stored to see how they shoot in my Wylde barrels.

[markm]

@HKGuns

Got it, thanks. My reloads shoot just fine. I may try some of the crap XM193 I have stored to see how they shoot in my Wylde barrels.

Mine shoots my loads good too. The infamous combo was that hot ass Win Q3131 in wylde chambers. XM is a slightly less vicious in my experience.

[T2C]

@markm

I’ve never got my White Oak to get sub moa. But in fairness it’s an old complete upper built by those baffoons at ADCO. Their horrific pinning probably destroyed the barrel’s accuracy.

Many wylde chamber barrels (including mine) don’t play well with 5.56 pressure ammo. Popped primers, bulges, and swipes much more common.

If a student shoots M193 ammunition in a carbine, with a .223 Wylde chamber and carbine length gas system, it is not unusual to see popped primers. A few turns with a standard 5.56mm chamber reamer, designed to lengthen the free bore, will resolve the pressure issue, but accuracy drops off with 68g and 80g loads at 300 yards.

Winchester Q3131A made in Israel is noticeably hotter than Q3131 made in CONUS.

[markm]

@T2C

If a student shoots M193 ammunition in a carbine, with a .223 Wylde chamber and carbine length gas system, it is not unusual to see popped primers. A few turns with a standard 5.56mm chamber reamer, designed to lengthen the free bore, will resolve the issue, but accuracy drops off with 68g and 80g loads at 300 yards.

Winchester Q3131A made in Israel is noticeably hotter than Q3131 made in CONUS.

Maybe it was the “A” ammo. The 3131 at time was pretty sloppy looking ammo… mixed headstamps, etc and was, sometimes, pretty hot stuff. Batches change over time, but I always favored the 3131A stuff years back.

[1168]

@T2C

If a student shoots M193 ammunition in a carbine, with a .223 Wylde chamber and carbine length gas system, it is not unusual to see popped primers. A few turns with a standard 5.56mm chamber reamer, designed to lengthen the free bore, will resolve the issue, but accuracy drops off with 68g and 80g loads at 300 yards.

Can you elaborate on what you’re calling M193?

Real US .mil M193? South African? IMI?

[DG23]

@T2C

If a student shoots M193 ammunition in a carbine, with a .223 Wylde chamber and carbine length gas system, it is not unusual to see popped primers. A few turns with a standard 5.56mm chamber reamer, designed to lengthen the free bore, will resolve the pressure issue, but accuracy drops off with 68g and 80g loads at 300 yards.

Accuracy will drop off with everything after getting honked out to a 5.56 chamber.

There will never come a day when some goofball at a range pulls out a reamer and thinks he is going to work on one of MY chambers to ‘help me out’.

The easy solution to over pressure? Don’t load the ammo so hot.

[T2C]

@markm

Maybe it was the “A” ammo. The 3131 at time was pretty sloppy looking ammo… mixed headstamps, etc and was, sometimes, pretty hot stuff. Batches change over time, but I always favored the 3131A stuff years back.

I’ve never seen factory Winchester Q3131 or Q3131A with mixed headstamps.

[T2C]

@1168

Can you elaborate on what you’re calling M193?

Real US .mil M193? South African? IMI?

I am referring to Federal M193 55g FMJ. It chronographs at 3,180 fps out of one of my RRA carbines with 16" barrel and Wylde chamber. The same ammunition chronographs at 3,056 fps out of an Armalite carbine with 16" barrel with 5.56mm chamber. Federal M193 chronographed at 2,964 fps out of my Colt 6920 carbine.

I did not chronograph the South African M193 I shot. The South African M193 was noticeably less accurate at 300 yards than the Federal M193 and Winchester Q3131 ammunition.

[DG23]

@T2C

The South African M193 was noticeably less accurate at 300 yards than the Federal M193 and Winchester Q3131 ammunition.

Comparing minute-of-milkjug ammo to minute-of-milkjug ammo gets a guy what?

A comparison between different lots of ammo that was never designed nor intended to be ‘match grade’ ammo.

[1168]

@T2C

I am referring to Federal M193 55g FMJ. It chronographs at 3,180 fps out of one of my RRA carbines with 16" barrel and Wylde chamber. The same ammunition chronographs at 3,056 fps out of an Armalite carbine with 16" barrel with 5.56mm chamber. Federal M193 chronographed at 2,964 fps out of my Colt 6920 carbine.

I did not chronograph the South African M193 I shot. The South African M193 was noticeably less accurate at 300 yards than the Federal M193 and Winchester Q3131 ammunition.

Thanks. Federal XM193 usually does reasonably OK around here in Wylde or 5.56 chambers. I like the brass. Most of the other “M193” is awful. Just awful. I’d highly recommend a chamber reaming, and even then…. awful.