Accuracy Issue – Pellet spread
This is a problem I’ll figure out for myself, by experimenting, but I thought I’d post the problem, in hopes of saving some time.
Gun: ‘TalonP
Pels: Benjamin domed, 27.8gr, .25 cal
When I first got my TalonP, I was putting pellets inside the area of a dime. Then, I got a shroud, and installed it. After the shroud installation, my groups became erratic.
To cut to the chase, I removed and reinstalled the barrel, shroud and power sheel, multiple time. Sometimes I could get fairly tight groups. Sometimes, it was almost impossible to zero the sights. No matter what I did, there would be flyers that were 2 or more inches from the point of zero.
I know for a fact that the pellets are not contacting anything related to the shroud. I have done visual through the bore and it’s perfect. I have also inspected the inside diameter of the muzzle and the hole in baffles. No contact. The shroud is perfectly installed. But what I’m wondering is if the power setting can cause this behavior. I did not mark the original power setting.
The problem appears to be one of not being able to reliably zero the TalonP, with my optic sight.
1) Can the power setting cause this?
2) Can barrel alignment cause this? Barrel? Barrel mount design would seem to make this an unlikely cause.
What I plan to do is remove the shroud and retest. Just to verify my belief this is not shroud related.
Then, I will try zeroing the gun with various power settings.
I might also try some other pellets but since these were working perfectly before, I’d like to solve the problem using these pellets.
Unless I’m missing something, this should lead to a solution. Is there something I have missed that could explain the problem, that I haven’t considered?
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It very well could be something to do with the hammer or breech area. I notice that sometimes it’s hard to push forward. Almost like it’s catching on something. Other times it’s very smooth. One time I had to push very hard to get it past some sticking point. Another time, when I pulled it to the rear and went to rotate it to the right, it seemed to be binding, as if something was keeping me from pulling it to the rear. Took a little force to rotate it to the right. Normally there is no resistance at all. I’ll disassemble it completely and inspect for sticking points, then retest.
With and without shroud, I have the same problem. Another thing I suspect (perhaps) is that with this particular pellet, it might not like very high pressure. I notice after shooting a few shots, the groups tighten up a bit. But then at some other lower pressure open up again. Almost like there is a sweet spot on the pressure. I’m going to get some lighter pellets and try them. I have some heavier ones and will try those tomorrow. Don’t like to change too many variables all at once.
I have only used one pellet type so far and only about 100 shots all together.
I’m also going to take my chrono out and check the velocities out at the same time.
Hey Mike;
First try shooting without the shroud to eliminate the possibility of a problem with the shroud itself.
When you reinstalled the barrel, did you tighten all four grub screws EVENLY?
If the barrel was tightened unevenly it would (might) change your POI but shouldn’t open up your groups.
What is your air pressure at ?
Inspect the crown on the barrel with the Q-tip method to check for burrs. If this was a brand new barrel, was it thoroughly cleaned?
If the hammer is chattering or not sliding in the frame smoothly, the gun will not be consistent.
When locking the breech into the “fire” position, always lock it to the same side.
The next time you have the gun apart, clean the inside of the frame very well and lube the Delrin bushings on the hammer with a dry lube such as Teflon. And using a Q-tip, lube the “o” rings inside the breech with silicon lube.
Try an assortment of different pellets.
Wildfire (Mike)
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I just realized what the problem is.
I was about to tear my gun apart and began by removing the tank. I noticed the tophat had come loose and was who knows where and changing with shots. That explains why I had trouble closing the valve on some shots and definitely would have a consistency effect. Now to figure out where it should be. Good thing I was planning to take a chrono tomorrow.
I have found this thread on the subject and will start there.
Anyone know what a good distance is for a starting point on the TalonP? Does anyone know the distance on the stock TalonP?
I have a video I will post, as soon as it finishes uploading.