Quote from: Engineerpower on February 02, 2018, 03:02:19 PM
I can't imagine the tiny amount of bullet rotation having a larger influence on the protector that the threadforms or how tightened it was.

I mean, anything is possible, but yeah.

Somehow, I can.
A bullet doing 15 to 20K RPM hitting threads has to be inducing some torque, either tighter, up to a point, or looser, and magazine after another magazine full, its really going the have to be snug to keep the latter tight.

A shotgun charge, down the bore, time after time will loosen screw in chokes, even with no bullet spin.

Under compression, I am not going to worry about it.
Likely to last right up until gun oil or some cleaning agent causes it to just disintegrate.

Back to the bulged primers, I am more than ever convinced that the casings are sticking in the chamber, while the breech block moves back that minute fraction, as just a very tiny few of my brass cases are doing so, but its running close to 100 percent on all of the steel casses.

Steel just doesnt release either, as fast or as much as brass.  Seen similar problems with certain auto loaders in shotguns and steel vs brass heads with plastic hulls.

Even some break open guns that wont release the steel heads for 20/30 seconds after firing.  It seems that the heat from firing has to disapate a bit before that steel will turn loose from the chamber walls.

As I said, all I could find of the latest steel cases had the bulge, but the realy rusty ones from being fired in another gun or two, quite some months earlier, did not.  Flat as they could be.

That said, I just went and looked at 46 of my "picups".

44 brass and 2 steel cases.

Now, 41 of those brass cases showed little or nothing, visible or feelable, (with a finger nail), while 3 showed and felt, the very center, including the firing pin indentation raising slightly up out of flat.  Just a tiny, tiny nipple like rise.
However, both steel cases showed the same type protrusion.  Not surprising to me.

There is a completely different elastic modulous between brass and steel.
And the hardness, (work hardness), of brass varies as well.

Hard brass has lots of "spring back", after firing.
Firing pushes everything out tight against the chamber walls of course.  Hard brass shrinks back almost to it's prefired dimensions, while soft brass will tend to flow more easily and end up closer to the chamber walls, (if not stick, at least temporarily), and steel much more so. (Steel has much less rebound in every case).

I would guess the cartridge walls are sticking to the chamber walls in some differing amounts, allowing the primers to gain some extrusion when stuck tight, and none when the hull moves freely back with the breechblock.

Steel, the worst, softer brass a little less and quite hard brass, back to almost its original dimensions. (Too many of those, without anealing, and it will crack/split.)

I have found similar type primer deformation in some loads/brands with some autoloading shotguns.  Switch loads or fire the same loads in a break open gun, and it no longer shows up.

Sorry, but if it functions as a spring, then it must be a duck!
In this case, a compression duck, umm, I mean spring.  (got confused there for a second) 

A spring doesnt have to be steel or even metal.

I think Cameron is dead on here.

Next question, please, anybody with one of the old model 51s in either caliber, can you tell us what their fired primers look like?

As I understand, the breech block does move a fraction and then stops for a split second.  I think that is where the very center of the primer has a chance to expand backwards.

Over pressure would expand, dead FLATTEN, the whole back side of said primer face.  Even to completely "fill in" that gap, the chamfer between the primer and the case head.

Here, we still have a very pronounced, triangular gap all around the outside of the primer circumfrence and the matching one in the inside edge of the primer pocket.

Over pressure, and subsequent metal flow would virtually fill that tiny gap completely tight.

I am in, set the date!

BTW Blackie, shot the 9mm bbl on the RIA 1911!
Nice!  Ran perfect!
It thinks it's a 70 yard gun!

Jug

Welcome from MO.

And Blackie, I finely got around to shooting the RIA 9mm.  Nice!

Nope, still havent had the 9mm bbl in the gun as yet.
But the .22 TCM sure does well!
I will likely go OWB with mine as well.

But did flip the spring again on mag #1, plus completely straightened the front lip "bend".
Works perfect again.

Put 80 plus rounds through it this PM, both guns.
50 of the same box of Win white box bulk as yesterday, which worked fine previously.

Just not yesterday after I flipped that spring.
Put it back today, fine again!
Not a hint of a nose dive.

Looks good, but I wear my belt so tight that it crushes the leather and reholstering without unbuckling the belt at least, is just about impossible.

And even worse with just a single, center clip, which I prefer.

And then of course, there is the laser.

Yep, but the box I started with only had about 20 left out of a hundred.  The previous 80 or so had worked just fine in both this mag and others, in the other gun.

Started bad in this one, and kept right on bad with 50/60 out of another new box.

Thinking about it, this gun likely fired some of those missing from that partial box, with no problems previously.
Maybe get back to it this PM.

Hey, the more I hear, the better the TCM idea sounds!

With the "short magazine load", (for Glocks, Bobergs, etc), the feed problems with the lousy magaznes might just go completely away.

At SD range, it should perform at least as good and likely better than the FN 5/7!

And if the bullet dont "get 'em", the muzzle blast will!

Oh boy!
Todays range session didnt go so well!
That mag was old #1, from the very first gun and had been deffect free as far as shooting went.
Only problem was spring snapping while loading and about half the time would only hold 6 rounds.

The problem that was still left that needed fixing was in the spring compressing.  The follower legs had been shortened and it was working fine in #1 gun.  So today before going out, I beveled the shoulders so the spring wouldnt bind entering the follower pocket.  Was able to bare hand load 7 rounds with no problem at all after mod.

Well, tried it in #2 with white box BULK Winchester.
Nose dives that would not quit on top rounds 1 & 2!

Even straightened that front flange slightly without disassembling the mag.
Ran over 80 rounds through it, just a big PITA!

Back to START!
Try it again in #1 pistol.
Even less bend in lip.
Flip spring, as that is something else I did today.
(Appeared to fit better flipped 180°.)

Mags are fussy SOB's!

I guess we can say" what did you expect for the price"?

I used to think that if one could pick and choose different parts, mechanics, from different cars, one could build their own "special car"!

And actually, I did just that 4 or 5 times.
Kind of a Johnny Cash "One Piece at a Time" Cadillac.  Except, I crossed brands, etc.

Some of them were very apparent from the outside, others were total "Sleepers"!

.22 TCM certainly would be an easier conversion here than .357 Sig!

And more beef left around the chamber.

But my question would be, would the AL frame take the beating from the breach block?
(Which also might have a problem here)

BUT, +P is their absolute limit; or so I heard.

Dont know what they might use for an "over pressure" proof load, or even if they do.

Also heard that +P+ was total a no-no, but then, supposedly, its also over SAMI specs.

Sorry crosstrains, when I first read your post I was afraid that you did make those mods, helter-skelter.
Relief to realize that you didnt.

Rereading, I think the lack of a comma between the beveling of the follower pocket and triming the legs threw me off.

Sorry again and good job!

Now, nice day here, going to modify the one mag that still gives me problems with getting 7 cartridges into it.  Going to bevel the pocket edges and possibly even enlarge the pocket slightly.

And then go put some lead down range in the back yard.

Will likely also try out the 9mm bbl on the RIA 9mm X .22 TCM 1911!

Sorry again!

Jug