Big issue at range today with CZ Scorpion

[Member 34319]

Could be a collection of carbon on the muzzle end creating bad crown.

 

[P7M13]

Good point by @Jeedia , however I would also look at the ammo.
I loaded a few hundred rounds, wound up pulling them all because I experienced the same problem: some on target, lots shooting low with no predictability. Found the powder in them was completely irregular. On investigation, found oil in my powder drop caused the flake to gunk up inside it, causing light loads and the occasional full load when the gunk ball would drop. No squibs - I was surprised.

 

[Jeedia]

Yea I forgot they had muzzle attachments. Good call. I would try different ammo. If it still doesn't work send it back.

 

[Kruel J]

I was suggested a nicked crown when my RPR gave me fits. Even went as far as to remove the muzzle break to inspect. Nope, crown was GTG. And you've had to really nick the heck out of it to have results like those at 50 yards.

 

[booboo206]

Try and if you have some of the other ammo and a hand gun that uses it try it in another gun. See if you get the same results. If it is maybe e-mail Win with the lot # and see if they say anything.

That's a really good idea, I'm going to try that as well when I take the scorpion with other ammo

 

[Kruel J]

Could be a collection of carbon on the muzzle end creating bad crown.

That would be a HECK of a lot of carbon, brother.

 

[No_Regerts]

Had an M1A do this. Muzzle device was loose.

 

[Kruel J]

Cheapest easiest thing to do is give her a quick once over cleaning-wise. Nothing too fancy. Guns shoot fine dirty, and sometimes even better. Then throw some more cheap-o ball rounds down range. Try some 115 FMJ's just for GP. Should either rule out the gun or the ammo pretty darn quick.

 

[Member 34319]

That would be a HECK of a lot of carbon, brother.

It's usually just a shift too, not sporadic changes. Had an AR shift impact from too much crud.

 

[Kruel J]

Had an M1A do this. Muzzle device was loose.

Was the bullet grazing it?

 

[Kruel J]

It's usually just a shift too, not sporadic changes. Had an AR shift impact from too much crud.

This!

 

[B5Ben]

Did you try that ammo in another gun or do you have any left to try in another 9mm? I would bet under powered/inconsistent ammo as well. You could try weighing them but federal doesn't have great consistency in their cases to get a decent baseline.

 

[CountryGent]

It does sound ammo-related from what has been said. And, parenthetically, I have had mixed results with Winchester white box stuff.

 

[No_Regerts]

Was the bullet grazing it?

Yes, it was. I could see copper buildup. My dads flash suppressor has a much larger crown than mine. Wouldn't have even noticed with his. Mine was deflecting rounds mostly downward and irregular.

 

[Kruel J]

It does sound ammo-related from what has been said. And, parenthetically, I have had mixed results with Winchester white box stuff.

Same!

 

[v0lcom13sn0w]

bad ammo or loose dot mount

 

[booboo206]

Did you try that ammo in another gun or do you have any left to try in another 9mm? I would bet under powered/inconsistent ammo as well. You could try weighing them but federal doesn't have great consistency in their cases to get a decent baseline.

No, unfortunately I didn't have another gun chambered in 9mm with me. I'm going to hit up an indoor range this evening and try the scorpion with different ammo, and also try the possibly problematic ammo in another gun and see what's going on

 

[Kruel J]

Yes, it was. I could see copper buildup. My dads flash suppressor has a much larger crown than mine. Wouldn't have even noticed with his. Mine was deflecting rounds mostly downward and irregular.

That was another suspect on my RPR debacle. But no grazing and no loosey loosey. Ended up being the optic mount.

 

[Kruel J]

bad ammo or loose dot mount

Same results with irons.

 

[Certaindeaf]

.The red dot and irons weren't off because every few rounds I'd still get a round right on target in the bullseye..

You're shooting from sandbags? To verify/ascertain accuracy one usually does.