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PostPosted: Fri Oct 18, 2013 8:36 am 
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Just bought an older Diana 34 in .20 cal and am finding that the breech is too tight and end up with clipped pellets. Should I chamfer the breech slightly ? Will I loose fps if I do? I couldn't be bothered to use a pellet seat, want to fix this.....


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PostPosted: Fri Oct 18, 2013 8:58 am 
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He is a weird question..Have you pushed the pellet into the barrel a bit more/further?
So that it would not get clipped on closing the action.
If you have a "Pellet Seating tool"...a pen tip, a pencil or a real honest to goodness pellet seating tool.
https://www.google.ca/search?q=airgun+p ... B700%3B500

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PostPosted: Sun Oct 20, 2013 3:42 pm 
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I don't see anything wrong with chamfering the breech end as long as you just make a small adjustment, I used a counter sink drill bit by hand just using your fingers to twist it no power tools.your just taking a skim off.....but you might find a different pellet might make a difference too.
KEN.


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PostPosted: Sun Oct 20, 2013 5:35 pm 
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KEN. wrote:
I don't see anything wrong with chamfering the breech end as long as you just make a small adjustment, I used a counter sink drill bit by hand just using your fingers to twist it no power tools.your just taking a skim off.....but you might find a different pellet might make a difference too.
KEN.


Yes, try another pellet before you fiddle with something that will be permanent.

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PostPosted: Mon Oct 21, 2013 6:54 pm 
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As I stated.I didn't want to mess with pellet seat. Pellet choice in .20 cal is limited, so what I have is 5 different brands and they all fit tight except one.

The breech being tight wouldn't allow for pushing in with a pen. Once the pellet started to move, it went in too far. Again, the idea is to fix and correct issues, not live with them.

Brought it to a friends machine shop before I got Voltars message, and put a chamfer into the barrel and put some fine sandpaper on an air drill and opened up the breech slightly. Worried all week about it after getting Walts message, I chronied it today and went from high 680's to 740's.

So I'm happy.


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PostPosted: Mon Oct 21, 2013 8:08 pm 
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Nicely done. 8)

What I meant was that if it were just the one brand of pellet that was too big, then avoiding that brand might be a good idea. Otherwise, what you just did is the best solution. I don't see the point of pellet seating tools, too bothersome to carry around and adds an extra process to the loading procedure, which means less shooting time :|

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PostPosted: Thu Oct 24, 2013 1:19 pm 
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I guess the next question would be where did you find an odd ball like that?...
A good score really!.......KEN.


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PostPosted: Thu Oct 24, 2013 1:43 pm 
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Seating the pellet too deeply will result in a lower velocity.... You can either make a seating tool that seats the pellet JUST below flush (as in 0.010") or chamfer the chamber slightly to allow the pellet to seat just below flush.... Pellet skirts are about 0.007-0.010" larger than the head, it will be the skirt that is preventing proper seating.... A slight bevel will fix that....

Bob

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PostPosted: Fri Nov 01, 2013 7:31 pm 
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Ive experienced the same issues at times with Chinese guns, what I have done in the past to fix them with good success was to ream the breech. I would ream the breech using my hand reamer from my RCBS reloading kit, do a little at a time as you test fit the pellet. Their maybe better ways but it was all I had and it worked great.

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