Originally Posted by carbinero
This is from a vendor I ordered a CMMG from, when I asked about using a reamer: “Recutting a chamber after its been chromed cuts through the chrome and leads to accelerated throat erosion.” To what extent is that valid?
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Originally Posted by C4IGrant
Not very much as the chrome in the chamber wears VERY fast naturally. C4
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Agreed. It’s a technically correct statement, but the chrome removed will be gone soon anyway.
Analogous to the initial mating and polish other parts go through early in their use.
And certainly better than having a gun that won’t run properly. (skintop911)
Question follows:
Ugh. Please help.
If that chrome wears so quickly, then how does a .223, Wylde, Noveske, 5.56 or whatever, stay that size for long? Is the chroming such a minute thickness?
I’ve read one “fix” for new ARs that don’t handle Wolf very well is to use only brass cased ammo for the first 1,000 rounds, then try Wolf again. Would this be due to the above referenced wear?
First of all, you will have to have a carbide reamer to ream a chrome chamber, the chrome is about 65 rockwell and is as hard or harder than the tool steel standard reamers are made of. If you can find a carbide reamer it will be $$$.
The only one I have seen was a GI reamer for the M1 carbine chrome barrels.
What chamber does your barrel have? The Wylde chambers are a bit tight and do have some problems with Wolf FTE.
If its a Nato 5.56 it was reemed tight, maby with a dull/worn reamer.
I have measured some lots of Wolf and found them to have some oversized necks, but they all worked with a MIL. spec. nato chamber.
In short I am done with the Wylde and any other tight match chambers, my Nato 5.56 barrels will all out shoot me and they work.
If you have to fix your problem, you can take a fired case, pop the primer out, tap the primer hole fore a rod, put some laping compound on it and polish your chamber. Most of the time it dont take much…AD
They are taking a bit from the origin of the rifling. This gives the bullet a bit of a jump before it encounters the resistance of the rifling begining to engrave the bullet. This jump serves to reduce peak chamber pressure a bit.
Thanks, folks. With your comments and a re-read of m-guns’ reamer description, I feel more comfortable with the concept.
Their site mentions the only company they are not concerned with truly having 5.56 is Colt. I assume knowledgeable shooters on this site would include a few others…?
