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It's likely your compound swings in an arc. Just cause it doesn't do it with an indicator in it doesn't mean it won't when there's tool pressure. Try with it's gibs locked up more, at least decent locking pressure. Somehow you need to get that compound moving in a straight line. Certainly...

There's no way for me to pick out favorites. Since I look at threads like this for ideas, I usually post a list so folks can go to their Netflix queue and stock up on ideas. In my experience, I usually recommend movies based upon a someones personality. But without aiming this at one person...

Al, at the point of sharp rifling edges, I could buy that they would clearly take more stress, wear, whatever. And would heat faster (if there was time). But, there really not that "sharp". And, let's take a 30cal as an example. 4 groove Kreiger barrel. A 308 is roughly 1" in circumference...

Your such a dumbass... Ok, the torch, sits on the part a while doesn't it? Not .002 seconds. That torch will also cut a piece of brass won't it? Faster than steel won't it? Especially if the brass is .012 thick and the steel is 1/2". We're not talking about giving the heat time to...

That's quite a reach to go from "They found erosion" to "It's the biggest culprit". They also mention that without mechanical wear, there isn't hardly any. Let's put those two together. I never said it did 0, only that it isn't the primary cause. And I still stand by that. Al Please...

1. Yes you are understanding my assertions correctly. 2. Because when you fireform with no bullet, much of the powder is not burnt in the "pressure" phase. That powder lays there and finishes burning in the barrel. As you've probably seen, pieces of powder lay in the barrel afterward, or...

You mean sorta like Stainless? Their testing was with long durations, not .002 sec. Cheers, Phil.

No, you and others say it is insignificant, a few % from various remarks above. I say it is not. I also did not say all wear can be eliminated. I said that increasing pressure so as to burn all propellant causes less residue, and thus less wear. I also said, my throats don't wear or "move"...

I think YOU are the one who defers. YOU are the one who claims heat and pressure consume the metal. I say it does not. Show scientific proof of why this is true, and don't use examples of texts written about large bore guns on ships or other inapplicable weapons. We're talking about match...

So refer me to the post here with "Science". You provide your opinion that you cannot back up with anything other than to say someone else said it, somewhere. Some guy from Sierra vaguely refers to this, and so it makes your unsubstantiated claims true. All the things I say have been observed...

So far, I see no scientific data whatsoever. I see talk about powders of 60 years ago causing chemical wear. On opinion from someone at Sierra (no data, and certainly not what I'd call authoritative opinion), suggesting pressure does this, but nowhere saying through what medium. Then another...

More like 300-350"

Only two reasons I can think of... Hot air rises, and that would mean there must be an equal and opposite reaction. Therefore, the bottom would receive more wear. Or maybe, pressure weighs a lot, and so with all that pressure, it would push harder on the bottom lands and wear them more. It...

15 PSI is roughly what you are standing in right now. Ambient? Plenty goes through a brake. Got no issue with that. Surface area. All I laugh at is that somehow by you guys estimation, that surface does not help the brake get hot, but DOES help it to get cold. Damn interesting. More...

First of all, pressure doesn't drop to atmospheric. Muzzle pressure on a magnum firing H4831 is said to be about 6000psi. So much for dropping to 15psi. Furthermore, fire that rifle at night, and you see some flame from the barrel. Stick on a muzzle brake, and the brake will clearly show the...

Because that is where all the dirt is? Because that is the only place there is an angle into which you are crushing a bullet? Most of the wear is where most of the abrasive is. Now hold the phone a minute. Temp has dropped? Was up to >zillion deg F and .000??? seconds later, it is ambient...

Mike, I'm just gonna say that "Lasting" to you and me are two different things. I've seen match barrels on a 223 last 30,000 rounds. And shoot more accurate on retirement day than the replacement. I'd say, "last" is a relative term, defined by each owner. (Most probably defined by the owners...

So you are saying that the engraving process at the throat is no more wear than farther down where the bullet is not being formed? I already told you that in post #2 Ah ha. So, Mapp gas burns at 5300F. You contend that the gas in the barrel "well exceed" that temp. Yet, after the bullet is...

Look guys, barrels get hot because of friction, not because of fire. A typical bullet leaves a barrel of a centerfire in roughly .002 seconds. In other words, at the 1000 round point, your barrel has been exposed to a GRAND TOTAL of 2 seconds burn time. Not quite enough to do the erosion you...

The case with more volume (larger case) will produce less pressure and in turn burn the powder less cleanly. It will be less efficient, and the additional dirt left behind will wear the barrel faster.