theWacoKid

In these cases, as the shooter, I ask two questions to determine if I will take it to the next level. First I ask, "did the bullet pass completely through the barrel/wall/hardcover?" If the answer is no, I will then ask "did the bullet make the hole in that target?" If the answer is yes, the shot scores. Now if there is question about whether the shot passed fully through hardcover or if it was the bullet that caused the hole, we need to investigate to get those answers. As an RO, I find the answers to these questions are most likely found at the hardcover strike, not at the target.

You're exactly right and it's become a subtle mission of mine to do my part to correct this common misunderstanding.

Evidence of the like is required if there is a presumption that the hole was made by something else. If there is no piece of wall missing large enough to cause the hole then you don't need grease ring or crown, the hole is the evidence.

You gauged it?

Not really the ideal way. I normally had to work on the lip at the front of the grip to allow the mag well to get rearward enough to line up, but whatever works.

Mag releases may be tapped for either. Most likely 4-40. The small front grip screw is 4-40, use that to solve the mystery.

I never replace springs as maintenance though I watch Aftec springs closely. Clean gun couple times a week. Full teardown a couple times a month.

Sometimes the instruction numbers are not going to work best for a particular gun. You should try working outside the specs a bit and see if you can find the sweet spot. Also, are the inside of the lips where the rim touches very smooth and polished? I'd suggest stoning and sanding them smooth and making sure that top round at the rear isn't sitting in some kind of depression.

If you saw my guns you'd see there is no fear.

Not a joke. If I actually wanted to tune a gun to a too hot load this is what I'd do. In fact, I built my last 3 guns this way and targeted the gun build around a known good load.

That's actually not much for holes being they're all the way out at the end of the barrel of a full size gun. It'll be plenty good with about 9.X gr of No.7 and a 124 jhp.

You're at 173 pf. I'd start adding holes in the barrel until this load makes about 168-169 pf. Yes, you'll be at the mercy in the future of the load coming in lighter and your barrel slowing down with age. But that is how you would tune a gun to this specific load. All the other stuff you can tune such as cycling resistance, stroke, main spring, recoil spring, thumb rest, grip, etc. are going to work similar for all loads.

could = coils

Adam's specs may not work in your gun. Your feed lips need to be square and set properly for the height the mags sit in your particular gun with your particular mag catch. Also be sure to keep inside of the feed lips smooth and burr free.

Nah, it's one thing. Titegroup and over charge. A tight piece of bulged brass doesn't cause pressure like that, it just shoots and may fail to extract. If it's out of battery it may blow out the base some but that relieves pressure not fire forms the base into the breech face under insane pressure.

My money here is on much higher than proof pressure resulting from an over charge. The damage and powder used are enough to lead me to this conclusion. Out of battery firings have a much different failure mode and anything brass related typically doesn't fail like this or show pressures this excessive.

8. New Sig 10. Slideride

https://www.speedshooter.com/product_detail.cfm?id=BCG30&n=Brazos-BCG-Thumbguard Absolutely not a drop in. Done properly you will machine both the frame and grip. The pain to simplicity ratio to install correctly into a 2011 is very high, imo.

Gotcha.

If it's a stock CK they come with 3 1/8" holes. I've had 9mm's with the following: no holes, 3 1/8" holes, 5 1/8" holes, 4 5/32" holes, 5 5/32" holes, 4 3/16" holes, 6 3/16" holes, 2 7/32" holes. These have been a mix of shorties, modifieds, and full-sizes. After all that the only thing I know for sure is the guns with no holes and 3 1/8" holes near the comp were the worst and that 3n38 isn't any good.

Pretty sure all your problems can be seen in this photo.

If your grip isn't moving and your sear nose and hammer hooks are good then it's likely the location of the sear spring. Try bending the lower tab of the sear spring a bit to make the sear spring locate higher. Also, peen out the end of the sear leg so it contacts both higher and further in on the sear.

I never said there is no pressure against the breech face. In fact, I said exactly the opposite. Bullet inertia (mass) matters to the profile of the pressure curve which will change the equal and opposite forces from total chamber pressure acting on the bullet base and the breech face. It's a smaller effect and not critical to the heart of this discussion. *How* the pressure loads are carried and what they act upon is the item of discussion. The amount of static tensile load carried by the locked barrel/slide assembly (i.e. the force attempting to push the slide rearward and pull the barrel forward across the interaction of the locking lugs) is only equal to the resistance (friction) of the bullet traveling down the barrel. The remaining equal and opposite forces not carried in tension by the slide/barrel assembly are unreacted at the bullet base and the breech face and thus accelerate the bullet forward and the slide rearward. I'm not sure how many more ways I can continue to say the same thing.

The magnitude of the pressures is irrelevant for the basis of how this works. A 9mm in a 40 barrel will still fire and that's the concept that matters. It is relevant because a 9mm fired in a 40 barrel applies no static tensile load from the pressure build up to the barrel/slide assembly (because there no friction) yet there is still equal pressure acting against the breech face and bullet base. Following your logic you would have to conclude the tensile load in the barrel/slide is still equal to the load that acts equal and opposite on the bullet base and breech face, but that is not the case. In this case all loads from pressure act to accelerate the bullet one way and the slide/barrel the other. Therefore demonstrating how the equal and opposite forces from the internal pressure on the bullet and breech face only generate tensile load in the barrel/slide equivalent to the frictional force opposing the motion of the bullet down the barrel. You previously said: "If a load has a peak pressure of 65 KSI it will try to push the breach face away from he barrel with about 7,800 lbs of force." All I'm saying is, yes, there is 7,800 lbf acting on the breech face but it's NOT 7,800 lbf pushing the breech face apart from the barrel (which puts the assembly in pure tension). The amount of force pushing the breech face away from the barrel is only equal to the frictional force of the bullet traveling down the barrel. The remaining force from the 7,800 lbf is unreacted on the slide/barrel assembly and thus becomes an external load acting on a free body causing the unit to accelerate. To cover all the bases, there will be significant tensile load in the slide due to its inertia and the sudden acceleration, but nobody seems to understand enough to get to this point. I've heard your argument before and I'm just doing my best to share the basic correct information so that it exists. I will reply again only to correct a FBD that you draw trying to defend your point.

It actually does change how the load is applied to the slide. A FBD diagram will explain how the accelerating bullet reduces the tensile load in the slide/barrel assembly as compared to treating it as a static pressure vessel. The extreme thought experiment is how firing a 9mm in a 40 barrel works.