Dirty Barrel = Pellet Sensitivity?

[Hsing-ee]

Just tied out a new stock on my HW30S. Haven’t shot it for a while.

Grouped like a Claymore mine never mind a shotgun with Hobby, H&N FTT, RWS Field.

Just about acceptable with JSBs, about 20mm at 30 yards no fliers.

Is it

1.dirty barrel
2. Ucked scope
3. Shooting off a beanbag
4. Poor technique
5. Sensitive barrel


Obviously it could be me but I could SEE what some of those pellets were doing and I never told them to do that.

[gsxrman]

20mm isn't too bad at 30. That should rule out scope, beanbag and technique.
I generally shoot a good few pellets through a barrel before comparing them for accuracy to "condition" the barrel for said pellet but they should be somewhere near if they are going to work.
Did it shoot fine before?
Could be just settling back in after not being used for a while or is the stock loose?

[Vernal]

The last time it happened to me it came back to loose scope mount screws.

[Dragonboy]

Just got a 30 kit but replaced the scope with a Hawke Airmax 2-7 x 32. I am getting 10mm groups at 30 yards out of the box with QYS Domed .177 4.50.

[andrewM]

Yes, check the stock screws and scope screws and also the screws attaching the barrel to the body - I had a problem there once and the screw merely needed tightening.

The jury seems to be undecided about dirty barrels. Some say never clean the barrel; some say occasionally and some do it frequently but it apparently takes time to become leaded afterwards, to provide consistency. I have never cleaned my barrels. Not sure what everyone thinks here.

Rgds
A

[Hsing-ee]

Just got a 30 kit but replaced the scope with a Hawke Airmax 2-7 x 32. I am getting 10mm groups at 30 yards out of the box with QYS Domed .177 4.50.

Ok I’ve got that scope and those pellets so I won’t leave them at home next time!

[averageplinker]

Were you shooting outside and was it windy?

[Hsing-ee]

Were you shooting outside and was it windy?

Indoors
Off a bench
No excuse!

[TonyL]

My guess, as others have said, would be loose fasteners on the stock or scope. 30s are usually insanely accurate. I think a dirty barrel causing these issues would only really apply if you had been shooting tin or plastic bodied pellets in it at some point.

If all fasteners check out and you use a known, good scope, and the issue persists, it might be worth cleaning the barrel to rule it out. I've never had to do one. Do remember to condition it again. Maybe worth checking the crown whilst you're at it?

Breech seal okay and correctly seated?

[mattb]

My new to me hw100 wouldn’t group well with anything other than jab 18.13gr 5.53 pellets until I polished out a couple of tight spots which also cleaned the barrel.
It now groups well with lots of different makes,head sizes and weights.

[Hsing-ee]

Breech seal okay and correctly seated?

Prime suspect now.

[andrewM]

Prime suspect now.

Slightly off track but could you free some space in your PM box as it is full?

Rgds
A

[averageplinker]

Indoors
Off a bench
No excuse!

Then i think you and others are looking at the most likely culprit the breech seal.

If that is ok I wonder if the piston seal has a nick or split from assembly?

As an aside, and a joke at my expense, I once had a very inaccurate.177" Sharp Ace.........until i recalled it was actually a .22" . In my defence i hadn't used for years until Lawrie rebuilt it for me.

[Hsing-ee]

Slightly off track but could you free some space in your PM box as it is full?

Rgds
A

Cleared now

[Hsing-ee]

Then i think you and others are looking at the most likely culprit the breech seal.

If that is ok I wonder if the piston seal has a nick or split from assembly?

As an aside, and a joke at my expense, I once had a very inaccurate.177" Sharp Ace.........until i recalled it was actually a .22" . In my defence i hadn't used for years until Lawrie rebuilt it for me.

Ah yes a tumbling .177 in a .22 could be a problem.. the seal was fine and holding air.

Going to try the seal then scrub the barrel and then it’s another bloody strip down …