.40 S&W Caliber Revolver? No Need For Moon "Clips" From Charter Arms

[Big Frank]

There's soft toilet paper?

Great Scott! What will they think of next? 

[tombogan03884]

There's soft toilet paper?

Relatively.
And QUIT squeezing the damn Charmin Timothy !     

[Timothy]

Relatively.
And QUIT squeezing the damn Charmin Timothy !     

I knew a stripper named Charmin!

I squoze her a time or two...   or three!

[Timothy]

Why ?
If it took 40 and 10mm it might sell, as it is it's just a waste of steel and advertising.

It would have had more market appeal had it been built for both the .40 and the 10mm!  It's a SS frame, should be built stout enough for the hotter cartridge I'd expect!

What's the difference in case length/cartridge length, about .020-.030"?

I know there is a cult following for the 10mm out there.

[tombogan03884]

It would have had more market appeal had it been built for both the .40 and the 10mm!  It's a SS frame, should be built stout enough for the hotter cartridge I'd expect!

What's the difference in case length/cartridge length, about .020-.030"?

I know there is a cult following for the 10mm out there.

.142 inches
Seems like a spring loaded clip would not be a reliable item to head space from, so the chamber probably has a lip that headspaces from the cartridge mouth.
Means you could not chamber for both.   


http://en.wikipedia.org/wiki/.40_S%26W

Case length    .850 in (21.6 mm)


http://en.wikipedia.org/wiki/10mm_Auto

Case length    25.20 mm (0.992 in)

[Sponsor]

[Timothy]

But .38 spcl to .357 mag is .135"!

What's the difference!  The datum reference being the bottom of the cartridge (primer end), wouldn't the headspace ratio be similar to the .38/.357?

[Pecos Bill]

But .38 spcl to .357 mag is .135"!

What's the difference!  The datum reference being the bottom of the cartridge (primer end), wouldn't the headspace ratio be similar to the .38/.357?

Let's see if I've got this straight: the 38 Spl and 357 Mag head space on the raised rim at the rear of the cartridge case and the 40 S&W and the 10 mm Auto head space on the case mouth, correct? I'd say that's why it's difficult to use both the 40 and the 10 in the same chamber. I understand that both can be used in the Smith 610 because of the moon clips but I don't think I'd want to try.

Pecos

[tombogan03884]

.38 and .357 head space from the rim, it's bigger around than the hole in the chamber so there's no way the rounds can move forward from that point.
.40 and 10 mm don't have rims, their largest case diameter is basically the same as the smallest case diameter, so traditional revolver head spacing at the rear of the cylinder won't work.
What they did with previous guns was machine a step in the chamber that left the forward portion larger than the bullet, but smaller than the case so they could headspace from the case mouth  .

[Solus]

.38 and .357 head space from the rim, it's bigger around than the hole in the chamber so there's no way the rounds can move forward from that point.
.40 and 10 mm don't have rims, their largest case diameter is basically the same as the smallest case diameter, so traditional revolver head spacing at the rear of the cylinder won't work.
What they did with previous guns was machine a step in the chamber that left the forward portion larger than the bullet, but smaller than the case so they could headspace from the case mouth  .

FYI (Not necessarily Tom) this is the same reason a tapper crimp is used in rimless straight wall cartridges. They head space on the mouth of the case and roll crimping would make that unreliable.  The amount of taper is important.  Too much and it could be too small to catch the step, to little and the bullets will be pushed into the case by recoil and feeding.  Case length in this type of cartridge is critical for reloading.  Well, for factory ammo too..but it is not your worry if they do it right.

P.S. one 'reason' for this revolver might be because you reload for .40 S&W but not .357 Mag and feel it would be fun or advantageous to shoot a revolver.

[alfsauve]

Plus if you're only going to use moon clips in a revolver then you can drill out the chambers so case length isn't an issue.