Bullets tumbling???

[mikeinla]

I am using a Sig P320 X5, 147 Extreme, 3.4 gr Titegroup.
I am getting a few bullets tumbling. It happens in two different guns.
Someone said the crimping might be to tight, another said unless the copper is broken the crimping is fine.
The third picture is a bullet pulled and reloading
Any ideas???

[2shotjoe]

Check the barrel.

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[McGuiver]

Bullets tumbling???

What is your expected velocity with 4.4 grains. These are swaged and flash coated in copper. These are not jacketed. You may be pushing them to fast.

They may be skipping over the rifling. What is the other pistol that is having problems with this load?

This is way above maximum for 147 grain.




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[TKM]

You want 3.3 to 3.4 gr of TG.


Those bullets aren't tumbling, they are running away from the bad man.

I hope you didn't make too many.

[mikeinla]

You want 3.3 to 3.4 gr of TG.


Those bullets aren't tumbling, they are running away from the bad man.

I hope you didn't make too many.

Sorry they are 3.4 not 4.4 like I posted

[mikeinla]

A couple weeks ago I shot the State IDPA match in Sacramento where they chrono your ammo. I do not remember what it was but is passed

[alpha_romeo_XV]

1. Measure the diameter of the pulled bullet
2. Clean the barrel good
3. Fire a couple into some jugs of water, recover them and see how deep the rifling marks are on them

[the86d]

The crimp looks pretty good for plated...
Plated always tucks in like that, but you shouldn't be tumbling with so much of the rifling engaged with the longer 147gr, FOR SURE...

Sorry I am not much help, but I haven't had this issues with any plated Xtreme (115 RN and 124gr FP), or plated from other MFRs (115, 118, 124, & 147), nor from any bullet I have ever fired, not even from Lead .380 in a9mm (AKA WAY SHORT PROJECTILE).

How used was your firearm when you bought it?

LEO trade-in, used?

What if your barrel is WAY leaded?

FMJs shoot straight?

Can we get a pic of your barrel insides?

[prod39]

As stated, you are using FMJ data for a plated bullet. I load 3.1 with moly coated leaf 147 bullets. This makes minor PF as well.

[robert101]

All good suggestions above. Do copper clad bullets of same weight tumble too?

[hambam105]

I had some quality cast 147s bullets tumble at 50 yards ~900 fps from five inch barrel.

Easy to spot on paper target.

Darndest thing...B-27 NRA Target...Even though the bullets tumbled, the score was about the same.
No such problems with same manufacturer in cast 124s & 115 at ~1,100 fps.

When the light is right, and the bullets travel ~1,000 fps, and you are situated close behind the shooter,
sometimes you can see the flight of the bullet with naked eye. Should you ever have the opportunity to see
this it will end any controversy about plated bullets.

[baranski]

Damn that a LOT of crimp. Way too much for a plated projectile, I'd even bet you're resizing them to .355 or smaller.

[TomReloaded]

I think you cut the plating and it's peeling off in flight (or maybe right out of the barrel?). You crimped the crap out of those, revolver style!

[noylj]

Bullet tumbling is almost always because the bullet diameter is too small or the muzzle is damaged.
If the ring on the bullet is from crimping, you are WAY over crimping. Taper crimp is just to remove the case mouth flare.
What is diameter of pulled bullet and what is actual barrel groove diameter.
Also, oblong bullet holes can be due to poor target backing/flexing in the wind

[the86d]

Bullet tumbling is almost always because the bullet diameter is too small or the muzzle is damaged.
If the ring on the bullet is from crimping, you are WAY over crimping. Taper crimp is just to remove the case mouth flare.
What is diameter of pulled bullet and what is actual barrel groove diameter.
Also, oblong bullet holes can be due to poor target backing/flexing in the wind

Shoot, I have been over-crimping all along?!?!?!

Doing an image search, this was posted on the AR15 forum... this is too much too?