February 19, 2008 at 9:26 pm #1576
Just recieved a machined lothar walther 25 Cal barrel (Machined from blank) for my shadow and fitted it but can’t obtain any reasonable grouping. 3″ at 27M! My 22 does sub .5″ groups. Any suggestions deeply appreachiated.February 19, 2008 at 10:31 pm #34416
remove your silencer first off. Have a discussion with whoever supplied said barrel about how it shot for them.
Check pellet fit and push some through it and make sure it never gets loose on the trip down the bore. Hopefully it tightens up in the last 1 1/2″ if the barrel is choked.
Walter….February 19, 2008 at 10:51 pm #34417mm123522Participant
Yah! What Voltar said. Check for the choke. Push a pellet through the bore with your cleaning rod. You should notice it get tighter twords the muzzle end when you start the pellet from the breach end. You could have the barrel in backwards . That is , with the choke at the breach end.
MarkFebruary 19, 2008 at 11:11 pm #34419justforfunParticipant
The first thing I would check is the crown.February 20, 2008 at 12:27 am #34423rob3drParticipant
My .25 Tony barrel wasnt doing as hot as I thought it should accuracy wise until I removed my mod on it…. groups just great now.
May be worth a look as Walter said.February 20, 2008 at 12:29 am #34425walkonkingParticipant
Do you have any baffeling in your shadow?
If so check it for clipping alsoFebruary 20, 2008 at 8:55 am #34464
Thanks for all the advice/suggestions.
So far we have tried groups with and without mod. No effect
pressure from 200 bar down to 170 bar. no effect
We even had barrel in vice and checked results (padded) and still no effect.
We pushed a pellet down barrel from breech and incountered resistance all the way and could feel more at the muzzel so choke seems ok.
I have E mailed back to Lothar Walther for advice. Hope we are not being overly ignorant but are not the blank barrels already crowned? Thinking trying to recrown barrel. Do have pictures of groups with .22 vs .25 at same range.February 20, 2008 at 9:20 pm #34507rustykfdParticipant
How about trying different pellets?February 20, 2008 at 10:06 pm #34516walkonkingParticipant
Can you take a pict of that muzzle end and post it here so we can have a look at it?February 20, 2008 at 10:10 pm #34517
yes a pic would be great. A pic of a couple pellets pushed through would help as well.
Walter….February 21, 2008 at 4:29 am #34551j3magnumParticipant
that barrel needs to be crowned… they come with a so-so crown job on them..February 21, 2008 at 4:33 am #34552teflontronParticipant
It may be an obvious question, but how did the rifle shoot before you put the .25 barrel in it?February 22, 2008 at 10:42 am #34680beargrease51Participant
Hi, i would forget contacting LW, can’t see them throwing any light on the subject, two things i would do, recrown the muzzle propperly, and secondly scrub the bore with bore paste, i have encountered dirty bore’s in the past, and that will spit the pellets allover the place. If your running @ 12ft lbs, then Kodiak/Baracuda are not goin to be much use @ 31 gn. and that does not leave a great deal of choice in the pellet range as i have tried the other brands which i find inaccurate.Good luck and let us know when you have sorted it. Regards B51February 22, 2008 at 3:42 pm #34691
Have sent barrel back to machinist and he is trying several things and more shooting from a vise. Here are a couple of grp pics one with .25 and one with .22 I (obviously) prefer the .22 groups. LW have not replied to my e mails. I believe there barrels are normally extremely accurate. The .22 barrel is a LW as well.
.25 Cal Group (SAD)
Here’s a .22 Group (Much happier)
February 22, 2008 at 4:28 pm #34697
I am wondering:
Is this machinist familiar with barrel work?
Have you had him do any other barrel work that ‘worked’?
What does he think is the trouble?
What do pellets pushed through the barrel look like?
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