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My Dan Wesson 357 with removable barrels call for a .006 shim.I stand corrected, my dad has some feeler gauges so we checked it.
.004 will pass between the two. .005 will not.
Not sure what acceptable limits are.
My Dan Wesson 357 with removable barrels call for a .006 shim.I stand corrected, my dad has some feeler gauges so we checked it.
.004 will pass between the two. .005 will not.
Not sure what acceptable limits are.
My Dan Wesson 357 with removable barrels call for a .006 shim.
Elasticity. Heat hardened steels are more brittle and crack/shatter versus deforming under stress then coming back to shape when the stress is relieved. And, speaking as a machinist, I know from experience it's cheaper/easier to harden post machining than use harder alloy vanadium steels, so it saves money to make the steel brittle by hardening post-manufacture than to machine harder alloys that won't get brittle and crack.Why use soft steel?
That picture doesn't look like a Colt, though. Ruger?That Colt barrel at the forcing cone looks like there is a slight step to the outside diameter. Which makes it seem like lead could be piled up on it?
I'm used to the face of a new forcing cone being machined flat, not a stepped outer diameter. Is this normal for older Colts?
The pic below is forcing cone wear, in my experience. The face has been blasted concave. This gun has only had jacketed ammo fired through it.
View attachment 1083830
Barrel steel- When comparing early Colt Trooper 357 to S&W M28-2, 357, the engraving tool easly marked the Colts barrel & frame. Very soft steel compared to the S&W.
Why use soft steel? Why surface harden hammer and sear? Machining time is shorter & cutters last longer.
For Colt, faster production time, more profit, to keep the company out of bankruptcy.
Sorry Colt lovers.
Interesting. My 1990's vintage GP100 shows easily noticeable flame cutting but just the slightest bit of forcing cone erosion--right around the inside lip.Notice there is no flame cutting, it hasn't been shot enough for it to happen. Or the frame is hardened and the barrel isn't.
I don't know if Ruger changed something on the later models, or if mine is defective. (no heat treat). I didn't like the fact that Ruger wouldn't talk to me about why it went bad so fast. I've never even heard of lead, midrange loads hurting a forcing cone.Interesting. My 1990's vintage GP100 shows easily noticeable flame cutting but just the slightest bit of forcing cone erosion--right around the inside lip.
I stay above 140gr. with jacketed in "hot" .357Mag loads. Seems to be working just fine.Forcing cone erosion is caused by one thing - use of very light bullets with certain powders that burn at a very high temperaure. That flame is only in the cone for a micro second but it is hot enough to cut steel until the bullet passes and the barrel vents. Don't use lightweight high velocity loads and your forcing cone will not erode. I learned that lesson the hard way.
This is my GP100, I suspect they are using soft steel like Colt does also.
View attachment 1084123
Notice there is no flame cutting, it hasn't been shot enough for it to happen. Or the frame is hardened and the barrel isn't. What ever the case, I don't know. This damage was done with shooting midrange lead bullet loads. Shouldn't have happened. Not enough loads through it.
Many of my S&Ws are much older and have been shot alot more with hotter loads and they don't look like this. (They are Model 28s)
Accuracy on this one is going South.