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I predicted you'd end up with something like this even before I saw your results.

The factor you're not including is the sizing die. If your sizing die and brass are within spec, the case comes...

The forming button/mandrel being screwed in is an important feature. Even if your die works perfect out of the box, you may want to turn a new button to suit your particular gas check material...

Can you not debulge a barrel? If the barrel is round at that point and accuracy is shot, anyway, I'd give it a try.

Drill and bore out a hole in a bar of steel to match the OD of the bulged...

Lee. And keep a heavy hammer handy when sizing/decapping big lots of brass. When the small or offcenter flashholes push the decapping stem back, just give it a couple taps.

A normal hammer works...

I have had zero luck trying to pull softcast pistol bullets in a press, even in 9mm which has a lot of the boolit exposed. If you try hard enough, you can get just the top half the boolit out, which...

Brass has much lower thermal conductivity compared to copper. It's only about 1/3 of pure copper, IIRC. Particularly in calibers with thinner gas checks, that may make some difference in the max...

I don't see how you benefit from casting your chamber, unless you have a method of making your necks thicker.

If your cartridges fit and fall back out the chamber, already, just turn to w/e...

In addition to ergos of your cheek weld, you might also consider where you want your two zero points to be. Lowering your sight axis is more optimal for shorter range shooting. Higher will be better...

More usually, when the bullet engraves into the leade, the bullet locks in place and won't come back out without a fight. If they shave lead when chambering, but they don't seize and lock in there? I...

With the o-ring, finger tight stays put for me. But I'm not a commercial reloader pumping out a million rounds a year of the same thing. It's the calibration that is not quite as consistent... you...

Clicked the link, and it's just a link to an expander plug that happens to be 431x427. Does NOE specifically recommend this plug for 431 bullets? I don't see this suggestion, anywhere. The "431" is...

Interesting. I wonder if you loaded cast or jacketed? The easier seating is expected. The case doesn't undergo any permanent deformation, because it's already the right size. So you don't need that...

I expect 10 thous to be the right thickness of material for a 6.5 check, if your mold is in spec.

If the fit is a little bit loose but it goes through a sizer and swages on, that's great. Much...

Hadn't noticed that. I suppose that's one reason to seat bullets a little deeper before you try to pull them. I did my setback testing right away.

I also lightly lube brass on the inside if it's...

Lous 357 expander is 356x360. That's exactly perfect for 356 bullets, IMO. No need to go 1 thous smaller.

I use NOE 358x362 for my 358 bullets. NOE 452x456 for my 452 bullets. Custom 401x404 for...

As little as 2.7 grains Red Dot gets a cast 55 grain bullet out the barrel of my 223's, subsonic and quiet. I like SR4759 for higher velocity. Always gas checked.

If you can get those bullets to...

Short brass could theoretically promote slightly faster throat erosion in high velocity cartridges like 223. If you have a real good shooter, it might be worth buying some OF'd. Lake City is usually...

https://i.imgur.com/1DMue6y.jpg

Here's a picture of some of these inside-out checks I recovered. I knew the checks weren't seated consistently and the OAL's after seating the checks was all over...

Depends on why it fell off.

If it was barely clinging by the mouth, then that's bad. When you fire the gun, the check doesn't get pushed onto the bullet. It just gets mashed in, inside out. So...

^ Even better, you can bend a spring steel wire that holds a case so it can pop in and back out. I have one dipper handle that will snap onto any 9mm, 380, 223, 357 case. I think I even made one from...

If the check is made to fit properly to the shank and it's the right material thickness to swage the shank 2-3 thous as it crimps, it will seat and stay on tight. Some of the aluminum checks are made...

Especially if you plan to use mixed headstamps in 9mm and no turning, that long neck is going to make for a roomy chamber with the thinner cases. I suppose you will have to get the freebore and leade...

Now I want a Contender to do stupid things like this!

I'm curious why so short? I would have imagined half the neck and a longer OAL.

I imagine repeating PCP rifles are fun in the same way a semiauto 22LR rifle is fun (at first). But I don't have a semiauto 22LR rifle, anymore. I haven't even shot 22LR but maybe twice in the last 5...

You can take into account the capabilities of the cartridge. That cartridge is capable of higher velocities than 1500-1600 fps. If you want to get closer to 2200+ or so, I'd get the gas check mold. ...