Tubby45

You have that sickness too?!?

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ken45

The 180 gr does not leave much space in the case. If the round is set too deep, or bullet setback happens from chambering/rechambering the ammo, the pressures can skyrocket. Three or four extra hundredths of an inch can double the pressure and destroy the gun.

If you are reloading, 180 gr bullets from different manufacturers can be a bit longer or shorter (due to different designs) and can change the case space and the pressures.

Check out "The Gun Zone" (The Gun Zone -- the authoritative resource for firearms information.) articles on 180gr 40SW kabooms.

I had a case blow in a Sig 226/40. It was reloaded below max with Hodgon Universal (another risk in 40SW) with 180 gr. I have several hundred rounds reloaded that I will not shoot, and almost a thousand bullets left that I will not reload unless I get a 10mm gun someday.

Personally, I wouldn't even trust factory 180gr 40SW. There have probably been more kabooms of that combination than all other calibers combined.

In the 40 or 50 thousand rounds that I've reloaded over the years, the 40SW/180gr/Universal Clays is the only significant problem I've had. Since then, I've read enough to steer me away. I prefer to keep my body intact, and my guns.


Yes, I believe the 10mm was designed around the 180gr. The 40SW is a compromise.

Ken

Tubby45

FYI, the 10mm was designed around 200gr bullet at 1200fps from a 5 inch barrel. The 40S&W was designed around a 180gr bullet at 980fps from a 5 inch barrel. It is an exact ballistic copy of the 10mm "Fed Lite" load the FBI used.

This applies to any bullet weight for any manufacturer. The lengths will all differ.

I have before. I don't consider TGZ to be authoritative. There are more variables in the equation of kBs than what the Internet and TGZ say. TGZ, IMO, is one of the major reasons why people are scared to death of .40 S&W Glocks.

If you have setback issues, there is a case mouth tension issue, not a bullet weight issue.

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Freakshow Manufacturing LLC
"You can kill it. We can help."
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ken45

Even big name ammo and gun (Sig, Glock) manufacturers warn about it. You can't put all the blame on case mouth tension. The problem is exacerbated by 1) the high pressure in 40SW 2) small available case volume 3) 180 gr bullets take even more of the case volume giving little room and causing the pressure to spike if the available space is less than perfect.

The issue was there long before TGZ. The issue was there even before the Web existed. Dean has just done a lot of documentation.

As I've said, I've had a case blow in a Sig.

If you don't think there is an issue in Glocks, then go to a range and pick up various 40SW brass. You will see a LOT more heavily bulged cases with the Glock firing pin mark than you will from other guns.

As I've said, I've only had ONE bad experience from reloading and that was 180gr 40SW. The other 40-50K rounds I've reloaded in other calibers never gave me any problem. YMMV.

Personally, I prefer to play it safe.

Ken

Tubby45

If the bullet is setback in the case, there isn't enough case mouth tension to hold it in place.

The 10mm operates at higher pressure and doesn't have bullet setback problems, even with heavier 200-230gr bullets.

I've never seen a Glock 40 bulge a case.

I've shot some very warm (30K psi) 45 Super loads in my G30's stock barrel and the cases never bulged.

__________________
Freakshow Manufacturing LLC
"You can kill it. We can help."
07 FFL/ 02 SOT