Inconsistant QB79

[ac12]

You need to be careful of freezing the tank.  If the tank is too cold, you could get an overfill condition.  The place filling the tank "should" measure fill by weight, as there is no other way to determine if the tank is full.

[Raizer]

There's only two places here that fill paintball tanks, both told me to always bring the tanks in as cold as I can get them.
One shop fills by weight, and he basically hooks the 9oz to his rig and cracks the valve for less than a second, weight is normally to spec and I got hardly any shots out of the one fill I had done by him.
The guy I normally get to fill mine fills them till they won't hold any more, got my spare tank filled today and it was rather warm to the touch after filling.
Normally been getting 250+ shots from a fill.

[Raizer]

Got my tin of superdomes today, nice looking pellets, seem harder lead than the JSBs.
Shot a couple of 10 shot groups with each, the RWS pellets keyholed 4 or possibly 5 out of 10 shots for some reason?? 2 of those were off paper.
Lil help?


Crown still looks OK too me too

[rebel415]

Got my tin of superdomes today, nice looking pellets, seem harder lead than the JSBs.
Shot a couple of 10 shot groups with each, the RWS pellets keyholed 4 or possibly 5 out of 10 shots for some reason?? 2 of those were off paper.
Lil help?


Crown still looks OK too me too

Do you have Crosman Premier 14.3 gr. domes in the brown box available to you? I know you said that originally the JSB pellets were excellent. I am just wondering if you might want to try the CPs. They are the only thing I shoot in all of my QB78s because they have proven to be unbelievably accurate for me. Just a thought. Or give Mike M. a call as well. He may be able to help.

Did you chrony those groups shot at 7 meters. Just wondering. You may have mentioned it earlier in the thread, I just don't remember.

EDIT:  I went back and read the thread and the link to your other thread and realize now my advice is probably useless. You must have something else going on here. One other thing to check for your low flyer every now and then is if you have a moderator or brake on the gun and you have a clipping problem. But if not, I don't know. Sorry I couldn't be more help.

[Raizer]

I've never seen them in .22 here in NZ, will get my boss to make some inquiries to some of our suppliers though, I have heard there a good pellet.
I haven't chrony'd it, will have to borrow my boss's chrony again and see what its doing, I just put a (probably over) full 9oz on it and its deff up to power!

Edit: Thats a rather good point!
I will put a bit of paint or twink in the baffles and exit hole of my LDC to see if any gets taken off.

[rebel415]

I've never seen them in .22 here in NZ, will get my boss to make some inquiries to some of our suppliers though, I have heard there a good pellet.
I haven't chrony'd it, will have to borrow my boss's chrony again and see what its doing, I just put a (probably over) full 9oz on it and its deff up to power!

OK sounds good. I was just revising my post when you posted so take a look at that as well. Good luck.

[rebel415]

I've never seen them in .22 here in NZ, will get my boss to make some inquiries to some of our suppliers though, I have heard there a good pellet.
I haven't chrony'd it, will have to borrow my boss's chrony again and see what its doing, I just put a (probably over) full 9oz on it and its deff up to power!

Edit: Thats a rather good point!
I will put a bit of paint or twink in the baffles and exit hole of my LDC to see if any gets taken off.

OK good, let me just tell you real quick. I had a moderator on a .22 QB78 and I would shoot dime size groups but about every 5 shots was a low left flyer about 2 to 3 inches down. It was clipping and I had to widen it out 3 times until the flyers stopped. Please let us know how that turns out.

[Raizer]

  Clipping it is.


Looks like I really need to add a 3rd grub screw to even it out, or drill the hole out another mm or so?

[rebel415]

Clipping it is.


Looks like I really need to add a 3rd grub screw to even it out, or drill the hole out another mm or so?

Great!! That sounds like it was your problem.

[Raizer]

30 seconds with a 9mm drill bit:

POI has come up and left too.

And I knew I had pulled that shot slightly off to the left in the JSB group 

Thanks for your help!!

[rebel415]

30 seconds with a 9mm drill bit:

POI has come up and left too.

And I knew I had pulled that shot slightly off to the left in the JSB group 

Thanks for your help!!

No problem at all. Glad I could help you. Nothing like seeing accurate QB groups once again.

[Raizer]

Just had it outside, much better grouping for the most part, but then there's a few flyers and the POI seemed to change once or twice.

Also noticed that the transfer port seal has a leak, will that affect accuracy/consistency much?
I know it will be a bit down on power while its leaking.

This was the best I've gotten out of it

8 shots, 18meters, JSB Exact Express 14.3gr.