Bullet jump in 9mm revolvers

[gmerkt]

Here's something to read about 9mm Parabellum revolvers. We've had a few people asking about these revolvers in the not too distant past.

I've owned several S&W revolvers chambered in 9mm P, and one Ruger. I've never encountered this issue myself. But I don't load to top end, either. Nor did I shoot factory 9mm ammo in them. Obviously it's happened, based on information in the article. And stands to reason because that's what the roll crimp is for on most rimmed revolver cartridges. However, I've never seen a cannelure and roll crimp on a .45 Auto Rim cartridge. Maybe because those are low enough velocity so as not to present this problem.

John Farnham: 'Bullet Jump' Makes 9mm Snubbies a No-No - The Truth About Guns

&#9664Previous Post Next Post▶ Gun guru John Farnam writes [via ammoland.com] Last weekend, during a Defensive Handgun Course, a student brought a Ruger five-shot revolver, chambered in 9mm. During an exercise, shooting factory 115gr hardball from a well-known and reputable manufacturer, a...

www.thetruthaboutguns.com

If you're handloading 9mm for revolvers, you'd want to make sure you had good brass that held the seated bullet well. Or if you were really concerned about the possibility, you could use just a taste of that primer sealer to cement the bullet in place. Without going nuts with the sealer. Lots of service ammo used to have seated bullets sealed in place with asphalt. 30-06, 7.62mm NATO and .45 ACP. So that may allay any thoughts about a sealed in bullet raising pressures inordinately. Probably a sealed in bullet doesn't raise pressures any more than a heavily crimped bullet.

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[salmon creek gary]

I have experienced both bullet creep and crimp jump using factory ammo in my (very light) Ruger LCR 9mm revolver.

I first discovered the problem after firing a four-round drill using factory Blazer Brass ammo. The projectile of the unfired 5th round was completely unseated during those four shots; it simply dropped to the ground as soon as I opened the cylinder to reload for the next drill. American Eagle ammo held up better (meaning none of those projectiles fell out onto the ground).

A few weeks after that experience, I tested a few different brands of 9mm factory ammo in my LCR revolver, blackening the crimp area of each round with a permanent marker to make any bullet creep very evident. It was a slow process to shoot & inspect the remaining rounds, then shoot & inspect again, and so on. Regardless of ammo brand, some bullet creep was evident after just one shot, and each successive shot caused a bit more creep. There was never enough creep to obstruct cylinder rotation, and none of the projectiles were completely unseated during these tests. (I did not include any Blazer Brass ammo in this experiment because I already knew how that would go ).

 

[Knobgoblin]

I have a small stash of the ruger branded ARX 9mm rounds that I'd like to try for revolver.
Sent an email long ago, with no response from them,Asking for this type of information on their product.
Any experience with these?

 

[orygun]

When I saw "bullet jump" I was imaging the jump to the forcing cone, not the bullet coming out of the case due to recoil. I know that as "bullet creep".
The jump to the forcing cone is the reason for the super short cylinder on some of the larger framed Ruger competition revolvers.

I don't own a 9mm revolver, but since it seems like the 9mm round can be prone to having the bullet move because of recoil, I'd sure test the ammo I planned on carrying!

 

[salmon creek gary]

. . . . I don't own a 9mm revolver, but since it seems like the 9mm round can be prone to having the bullet move because of recoil, I'd sure test the ammo I planned on carrying!

My thought exactly, but it led me to conclude that I'd never trust my LCR9 enough for EDC. Range gun, then? Nope, so small and light it's downright unpleasant to shoot after 15-20 rounds. I'd offer it for sale, but I really don't dislike anyone that much.

 

[gmerkt]

ARX 9mm rounds

The ARX bullet is a frangible, made of some kind of powdered copper/polymer compound. Could be those present more friction against the cartridge case when seated. More than smooth copper, anyway. Just a guess.

Ruger no longer markets the ARX line. It's made by Inceptor and that company sells loaded ammo and component bullets that are like the Ruger branded product.

 

[Knobgoblin]

The ARX bullet is a frangible, made of some kind of powdered copper/polymer compound. Could be those present more friction against the cartridge case when seated. More than smooth copper, anyway. Just a guess.

Ruger no longer markets the ARX line. It's made by Inceptor and that company sells loaded ammo and component bullets that are like the Ruger branded product.

I had 2 conflicting thoughts.
The bullets are light, extremely light, so maybe inertia wouldn't have as much to act on?
But , the polymer may actually degrade differently in typical carry conditions (moisture from proximity to the body being one) causing loss of tension in case neck.
I'm never carrying that one revolver anyway so it's all just postulation.

 

[titsonritz]

I've had the same thing happen with an S&W 342 .38 spl using 110gr. Corban JHP.

 

[spookshack]

I don't own a 9mm revolver, but if I did, I'd probably refrain from "jumping" into a random hopscotch tournament at the local "Y". Just sayin'

 

[gmerkt]

I should mention, Lee makes undersize sizing dies. For sure they make them in 9mm. This might be some help in tightening up 9mm brass.