Leshiy .25 350mm – POI shifting
Hi,
I test all PCPs that I receive in laboratory-like conditions:
I must admit than many high end airguns and barrels failed my test (9 groups, 5 shots in each group, 50 meters). By failure I mean any anomaly in grouping during 45 shots. The mean group size should stay below 20mm. And yes, I can shoot:
http://talonairgun.com/forum/viewtopic.php?f=34&t=34742
This is what I expect from a high end airgun. My best group was 3.5mm CTC at 50 meters so you can just imagine how small my error can be.
This is how I tested Leshiy (the doors were opened during testing, no worries 😉 ):
In the beginning everything was quite acceptable at the distance of 50 meters:
Then, after maybe 30 shots the group moved 3cm to the left:
I tested that at 10 meters and POI was shifted by like 6mm. After barrel cleaning everything was spot on again. It looks like I need to clean the barrel every 30 shots or so. Something is simply wrong with that LW barrel. I may just guess that it is just me with that problem. Am I right?
All Replies
I agree that LW barrel is really soft if aluminum clamp can create a choking effect.
Don’t think an aluminum clamp can create a choke on a steel barrel, regardless of the steel quality. Personally, i think your barrel for whatever reason does not have concentric rifling its entire length.
LW supply barrels in different grades, depending on how much you want to spend.
You should contact Ed and ask for a solution.
Wingman ordered BSA Scorpion barrels and adapted them to fit Leshiy.
I agree that LW barrel is really soft if aluminum clamp can create a choking effect.
just curious what it will take to get another barrel sent to you. should not be a big deal OR?
I think he ordered BSA Barrel Blanks.
Will just order an R10 barrel direct from BSA and get a gunsmith to machine fit it after a full inspection.
I don’t think a LW or Weihrauch button rifled barrel is going to suit the Leshiy clamping method.
Needs to be hammer forged.
Be careful with BSA, Wingman had to return a couple of them.
When I get my Leshiy then I am going to get a BSA R10 barrel (£70) and have it turned down to fit.
Don’t think I can go through the hassle of having a naff LW one.
my 250mm barrel and jsb 25grain pellets not group well if the speed is less than 235m/s (755fps)
The 2 screws go just underneath the barrel about an inch before the end of barrel for the 250mm version. Without taking one fully apart, I would think it is a C-clamp pipe hanger type of retention. CTC distance between the screws is about 1 inch so force should be distributed.
That doesn’t sound like a very good way of securing the barrel as it would be either pushing the barrel up or down. Any weakness areas in the barrel would therefore be increased x fold.
I think the consensus here is that the LW barrel the OP has is rubbish and should be exchanged with the dealer. The problem with airgun barrels is that it can be hit or miss if you get a good one or not. Hopefully he will get a good one when he exchanges it but there is no guarantee that he will.
The 2 screws go just underneath the barrel about an inch before the end of barrel for the 250mm version. Without taking one fully apart, I would think it is a C-clamp pipe hanger type of retention. CTC distance between the screws is about 1 inch so force should be distributed.
You guys are far more “technical” than I am but for the sake of tossing this out there, I’m gonna’ mention this… I’ve noticed with my new .22 cal Leshiy that my POI shifts immediately when I drop off of the regulator. I’m certain that You must’ve already eliminated this as the cause but Just in case…
When I’m not watching my gauge or counting my shots I can still tell when I need to recharge the gun because she starts shooting right of POI. I know…I’m stating the obvious but for what it’s worth I thought that I’d mention it.
Out of curiosity, how do those two bolts lock the barrel in place as they go through to the other side to hold the magnet in place ?
Call dealer and exchange. I’d certainly do that but (fortunately) mine shoots perfectly well. So far with 250mm barrel. And since I plan long one in .177 it shouldn’t be a problem.
You have a weird problem….
But is it the barrel or the way the barrel is fitted? (If the barrel is the problem…)
Could you notice if the barrel is overall dirty or is lead building up just at the tight spot?
Have you spoken with Ed ?
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– Fill the tank to 250 Bar
– Makesure the pellets used are all the same head size and weight depending on calibre.
Set the regulator to one of the following depending on calibre.
0.177 Set to 100 Bar
0.20 Set to 105 Bar
0.22 Set to 110 Bar
0.25 Set to 115 Bar
0.30 Set to 120 Bar
Fire a group of 20 shots, measure the group size, re-fill the tank to 250 Bar, repeat the process.
If the group sizes are then roughly of all the same size, repeat but increase the number of shots each time until you get to the point where the groups start to open up.
Also, one other thing with the Leshiy is unless you put the pellets in the same way each time then the heads could get deformed and give different results etc. Apparently the machining on the breach end is sometimes not great or uniformed.
PS. I think you mentioned in a previous post that there was lead build up in the middle of the barrel. THAT should not be happening and will cause your POI to get worse the more pellets you shoot before cleaning. Sounds like your barrel has a tight spot in the middle which is a fault. Most airgun barrels are poorly constructed and mass produced. Sometimes you can be lucky and get good ones and other times you get absolute rubbish. High end target shooters normally have barrels built and machined from scratch but that costs like $400-$700 for a barrel.
I know this is off this topic, but I have seen several folks in different threads talk about .30 cal. Dose anybody have a 30 cal barrel in their Leshiy? Thanks Bill C!