FDPCP has suddenly become innacurate
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FDPCP has suddenly become innacurate
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Topic: FDPCP has suddenly become innacurate (Read 1243 times))
datilD
In search of the quietest air rifle!
Shooter
Posts: 79
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Real Name: Derek
FDPCP has suddenly become innacurate
«
on:
September 08, 2014, 01:59:46 PM »
Hi All,
I have a .22 FDPCP that is basically stock except for some minor trigger and barrel work. I polished the sear and lubed everything when I had the gun apart. The barrel was recrowned, and I polished the leade. I also cleaned the barrel multiple times before and after the barrel work.
After the minor mods, I installed a 6.5" TKO and aligned it on the barrel while sighting through it. I tried a few different pellets, and found that it liked Gamo wadcutters. After sighting in a 3-9 x 42 Centerpoint scope, I was getting 3/8" - 1/2" groups at 20 yards. Crosman hollow points won't group tighter than 1.25" at 20 yards. I have tried 5 other pellets in the AG, but nothing will group tighter than the Gamo pellets.
A few weeks ago, I started to notice that the AG was shooting erratically. I used a rest, and tried to get some groups to know how to readjust the scope. (That had to be it, right?) I can't get any of the pellets to group worth anything. I tried 6 different types pellets. When I went to put the AG away, I noticed that I felt a "bump" as I moved it. The barrel is moving very slightly. The barrel band is tight, and the screws at the breech are tight. What is going on? I have also noticed that the knurled end of the HPA tube is making contact with the barrel. I am not to happy with that. I would like to add a spacer to get a gap, and possibly add another barrel band closer to the end.
Does anyone know why my barrel is moving slightly? I really baby my AG, and have not bumped it. What can I do to get things tight and accurate again? Does anyone make a barrel band that will fit?
Thanks in advance for your expert advice!
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Motorhead
Field Target Shooter .... Stand em up Shoot em down
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Real Name: Scott
Re: FDPCP has suddenly become innacurate
«
Reply #1 on:
September 08, 2014, 02:58:31 PM »
Turn the TKO to a different position, or remove it ... if POI changes too
You have an alignment / clipping issue.
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Ribbonstone
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Posts: 12030
Re: FDPCP has suddenly become innacurate
«
Reply #2 on:
September 08, 2014, 06:58:33 PM »
1. As mentioned, remove the LDC and see if that helps.
2. Clean the barrel.
3. check the grub screws that hold the barrel in place.
4. check for any stray leaks. both at the bolt probe/breech and at the barrel/breech joint (it can leak FORWRD at the barrel/breech joint if the front barrel o-ring is bad).
5. Check the scope/rings. If possible, swap for a scope from a known to be good rifle.
6. If you've adjusted the trigger to a fine edge, try unadjusting it.
7. Loosen the front stock screw 1/2 a turn. Could be that the wood has shifted in it's new enviroment and it's binding when pulled tight.
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datilD
In search of the quietest air rifle!
Shooter
Posts: 79
yes
Real Name: Derek
Re: FDPCP has suddenly become innacurate
«
Reply #3 on:
September 08, 2014, 11:27:44 PM »
Excellent. Thanks for the pointers in getting my AG back in shape.
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datilD
In search of the quietest air rifle!
Shooter
Posts: 79
yes
Real Name: Derek
Re: FDPCP has suddenly become innacurate
«
Reply #4 on:
September 23, 2014, 01:39:27 PM »
Quick update: The FD PCP is back to being a tack driver. The LDC needed to be rotated 90 degrees, and the grub screw was very slightly loose. I checked all of the other screws, and gave them each a tweak while I was at it, too.
I guess that I must have bumped the LDC, though I try to be very careful. I thought that if I was experiencing pellet clipping it would be noisy.
Thanks for getting me back on track!
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FDPCP has suddenly become innacurate