Diana 240 Classic Keyholing

T

trky chsr

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Got the grandsons a new 240 classic in 177 and it's very accurate but it keyholes the pellets. My son has tried a couple of diiferent brands with the same results. Any ideas? TC
 
Regular or lightweight alloy pellets? Earlier Dianna was using Chinese barrels of the German guns ,people went wild and they returned to German made.
 
Ditto on the pellet type question. Cheap pellets are generally a bad idea, the Gamo brand being one especially to stay clear of. But the worst are the plastic/metal hybrid 'high velocity' types which spray all over the place and often hit sideways. I tried some out of my Pardini K12 some years ago for a laugh. Couldn't hit a walnut at 10 metres, which is silly, as that pistol can hit a dime at 10 metres all day long. Using something like an RWS Hobby at the low end of quality should deliver better results for you, a good compromise between low price and consistent weight with a decently smooth finish.
 
My son has been doing all the playing with his kids and I'm not sure of the pellet brands but I'll get some good ones and we'll see. He was puzzled as he was also shooting and old pellet gun and it was producing nice round holes. TC
 
I'd get the crown under some good light and examine that as well, in case it has suffered some damage. A relatively tiny nick/dent in the crown can cause pellets to tumble.
 
jacpor said:
Hi mbogo3
Around what time(era) did they use Chinese barrel?

Thanks
Click to expand...

It was several years ago ,they had more lands and grooves than the German barrels.It was on the Dianawerke Forum.That idea went over like a pregnant pole vaulter.
 
Not the case here but BSA guns had generous bores and only the largest pellets would give a good seal.Twirling a q-tip in the muzzle will soon show any rough spots as the cotton will come off and tangle in the flaw.
 
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"It was several years ago ,they had more lands and grooves than the German barrels.It was on the Dianawerke Forum.That idea went over like a pregnant pole vaulter."

They would have the t05 trigger and the barrel will have 12 lands, rather than 8. And the 34 and 350 models specifically. Diana culled out barrels that didn't pass their own QC. And they tossed out so many that they found they didn't save any production costs. That is why they went back to German barrels. I have a 34 with that barrel and have to say it's a shooter with a couple of different pellets. I mean dime size groups at 30 plus yards with JSB domes, benched. It's taken limits of squirrels, shots to 38 yards. It took a groundhog each of the last 2 weekends at 25 yards with a single shot to the brain.
So my answer is forget any tumbling issue being due to country of origin. Something else going on.
 
Check the seating depth when you insert the pellets. I have the closely related Diana 24C, and the breech has a slight angle to it, so if the pellet isn't all the way in, a bit of the skirt can get clipped when you close the action.

Mine also has a very tight bore and has a lot of trouble with alloy pellets. H&N Match Greens sometimes won't fire, and H&N Barracuda Greens or Field Target Trophy Greens won't fire at all unless pushed pretty deep into the barrel.

The piston is also pretty weak. I don't have a chrony, but from plinking, it's barely more powerful than a HW75 pistol which is sold as reaching only around 360 FPS
 
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