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  #1  
Old 11-07-2016, 09:18 PM
RogerOrange RogerOrange is offline
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Unhappy S&W 929 9mm Bullet jump

Yesterday I shot my 929 9mm revolver for the first time and experienced a problem with the ammo where the bullets have "jumped" out of the casings

The Ammo was Blazer 9mm MFJ 115 factory ammo. And I used TK custom moonclips.

Did I do something wrong like there is a up and down side on in witch side I use the Moon clip?

Recomended factory ammo?

Looking forward to your reply.


Rogier
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Old 11-08-2016, 12:11 AM
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Just the ammo vs the amount of recoil.

Other ammo may have a lacquer bullet sealer that may prevent this from happening or a lower fps that may help.

Finding good ammo for ones weapon just takes time.
Good luck.
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Old 11-08-2016, 09:29 PM
S&WIowegan S&WIowegan is offline
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For whatever reason there is insufficient neck tension with that Blazer ammo. I shoot Federal 147 gr JTC in my 929 and don't get bullet pull. The heavy ammo has much lower muzzle velocity. Just try different ammo until you find what doesn't jump.
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Old 11-08-2016, 11:03 PM
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Quote:
Originally Posted by RogerOrange View Post
Yesterday I shot my 929 9mm revolver for the first time and experienced a problem with the ammo where the bullets have "jumped" out of the casings

The Ammo was Blazer 9mm MFJ 115 factory ammo. And I used TK custom moonclips.

Did I do something wrong like there is a up and down side on in witch side I use the Moon clip?

Recomended factory ammo?

Looking forward to your reply.


Rogier
On the TK clips the preferred orientation is the TK 'logo' actually the initials facing the rear of the revolver.
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Old 11-09-2016, 03:09 AM
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It doesn't matter how you face them. I have used them both ways with no distinguishable difference. TKs are great clips.
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Old 11-09-2016, 11:58 AM
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Moon clips are stamped, so there is a sharp side and rounded side. The logo is on the rounded side, and the sharp (flat) side should be down. I doubt it makes a difference, but consistency is always better than variety as it applies to shooting.

This has no bearing on bullet jump, which depends on the quality of the crimp and recoil of the firearm. In a pistol, the bullets are roughly supported by the magazine walls. Bullets tend to be seated deeper, as they are chambered and rechambered (e.g., load, rack and top-off). Bullets tend to jump (grow longer) in a revolver because they are constrained only at the base, and the recoil is sharper.

I have not had a problem with brass cases, factory or hand loaded.
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Old 11-09-2016, 01:50 PM
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Another problem with aluminum cased Blazer 9x19 when first introduced was gas leakage around the primer. Gas jets would eat up the breech face of pistols in short order. Probably not a concern now, but have steered clear of it ever since! (The odd old box still turns up, though.)

Insufficient bullet grip seems especially bad if run through pistols. Pressures can raise quickly when the 9mm bullet is pushed too deep into the case, aluminum or brass..
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