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  #1  
Old 01-02-2020, 06:09 PM
WaterDR WaterDR is offline
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Rounds tumbling

Helping a friend.....

She has 147 gn handloads that appear to be tumbling when hitting the paper. Holes are inconsistent looking. The barrel is clean. She hasn’t tried box ammo yet out of same gun but will.

You suspect the bullet is the wrong diameter? Would either too big or too small result in poor flight pattern?

Or could the round be going too slow?
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  #2  
Old 01-02-2020, 06:19 PM
Jim Watson Jim Watson is online now
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I had some plated 147s tumble when I tried a different brand. I don't recall the diameter difference.

Holes "inconsistent" "hitting the paper".
Loose hanging paper will give ragged holes.
Stiff paper targets or paper tight on cardboard gives cleaner holes. Look for. a grease ring all the way around.
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  #3  
Old 01-02-2020, 07:46 PM
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Grandpas50AE Grandpas50AE is offline
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In my experience, there are four main causes for bullet tumbling: 1) bullet not at proper velocity for the barrel to stabilize, 2) Bullet not the right size to get stabilized, 3) twist rate in barrel rifling not right for bullet/weight to get stabilized, 4) bullet shank not long enough to provide enough twist to stabilize bullet. Most commonly available commercial bullets are of proven designs that eliminate #4, so the other three are the most common offenders. Other than that, a heavily leaded barrel can cause both accuracy and tumbling issues (because the bullet cannot properly engage the rifling) and cause increased pressure issues that can be detected over a chronograph with erratic velocities. Mostly the first three with most commercially offered factory loadings.
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  #4  
Old 01-02-2020, 09:52 PM
jjfitch jjfitch is offline
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What hand gun and who's bullets?

Not all barrels are created equal and not all bullets are either!

Look up the SAAMI specs for the 9mm it will give the barrel inside diameter.

Next use a micrometer to measure the bullet diameter after being pulled from a case. Some reloading techniques will reduce the diameter.

Bullet fit is very important a .355 barrel needs .356 or larger diameter lead, plated or coated bullets or tumbling may result. Jacketed should be OK at .355.

To get optimal performance I cast at .358 and size to .357 to get a .355+ barrel to perform. This bullet also performs great in 38 Super and .38 Spl. too! the lead I use is around 10 BHN and my lube is fairly soft.

Be sure that your barrel is "squeaky" clean before further testing.

Slugging your barrel may be required at some point but properly sized and reloaded bullets may solve your tumbling problem.

All the best in 2020,
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Last edited by jjfitch; 01-03-2020 at 10:55 AM.
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  #5  
Old 01-03-2020, 12:19 AM
waktasz waktasz is online now
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Bet you a dollar they are plated bullets
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  #6  
Old 01-03-2020, 08:54 AM
WaterDR WaterDR is offline
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They are in fact.....
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  #7  
Old 01-03-2020, 08:54 AM
M-Peltier M-Peltier is offline
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Being hand loads I bet they're over crimped too. if you have a bullet puller, pull one and see if its deformed below the case mouth.
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Last edited by M-Peltier; 01-04-2020 at 08:43 AM.
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  #8  
Old 01-03-2020, 12:25 PM
jtq jtq is online now
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Quote:
Originally Posted by Jim Watson View Post
Holes "inconsistent" "hitting the paper".
Loose hanging paper will give ragged holes.
Stiff paper targets or paper tight on cardboard gives cleaner holes.
This is usually what I suspect.
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  #9  
Old 01-03-2020, 02:51 PM
waktasz waktasz is online now
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Quote:
Originally Posted by WaterDR View Post
They are in fact.....
I accept paypal
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  #10  
Old 02-15-2020, 08:50 PM
liggett liggett is offline
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I have one pistol that exhibits signs of bullet tumble over 15yds. It's a 4" SA 1911 compact. My 147gr coated handloads that work perfectly in EVERY other 9mm handgun we own, don't seem to be suited to that pistol. This spring/summer, I'm going to work up some 115 and 124 gr. loads at the same Power Factor to see if that cures the issue by having more velocity.
Too cold now.
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  #11  
Old Yesterday, 08:33 AM
1911_Bandit 1911_Bandit is offline
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Damaged crown?
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  #12  
Old Yesterday, 09:26 AM
pat_jones pat_jones is online now
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Probably over crimping on the plated bullets.

Crimp just enough to meet the SAAMI spec at the case mouth. In the case of 9mm, that's .380, maybe down to .377.


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  #13  
Old Yesterday, 12:30 PM
jjfitch jjfitch is offline
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See Post #4!

Quote:
Originally Posted by pat_jones View Post
Probably over crimping on the plated bullets.

Crimp just enough to meet the SAAMI spec at the case mouth. In the case of 9mm, that's .380, maybe down to .377.


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Smiles,
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  #14  
Old Yesterday, 09:02 PM
kp321 kp321 is offline
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I had a similar experience with cast 147’s tumbling when using fast powders. The bullet caster recommended using slow powders. Switching from Green Dot to Blue Dot did the trick. Don’t understand but it worked. Powder type was the only change, velocities were same.
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