ED-Gun .25 SUPER MAG , MAKING A NEW SLUG BARREL

Forums PCP Airguns ED-Gun .25 SUPER MAG , MAKING A NEW SLUG BARREL

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    jwrabbit123
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    Member

    Ok so I got a un-choked  LW barrel blank in .25 cal .470 OD , Here is what will be needed to make a proper slug barrel

    barrel blank

    old bore brush in .22 or .25 , remove bristles as this will be used to make a cast of the bore.

    a hand drill , or lathe , a vise . a bit of lead  (to make a cast of barrel ), a ladle to melt lead in . and a cleaning rod .  HEX M 12X1.25 DIE   ,  and a vise with scrap wood . and  this is only required if you want to make a match barrel ,

    600 grit , 320 grit 220 grit wheeler or similar compound , and most important Crest tooth paste.

    OK so first make sure rifling is good and no defects , then clamp in vise with wood , thread both ends of barrel about 1 inch , use plenty of oil , once threads perfect then file both ends of barrel square or square off in lathe ,

    and crown barrel at preference ,11degree or 45degree I prefer recessed 11 degree .

    Next step only required to make a match barrel

    clean barrel ,remove bristles off your old cleaning brush .put this on your cleaning rod , put cleaning rod into barrel 1/4 inch from end . does not matter which end of barrel you use ,then  melt your lead and heat your end of barrel up so it is hot to touch but not red hot , this is only so lead helps to make a identical cast of barrel and form on your old cleaning brush . once you pour it  remove it . take a knife and make some slices does not matter which way or where this is just a place for a bit of compound to sit in while hand lapping .. ok next put the 220 on your new cast and start hand brushing it will be hard at first make 20 strokes , clean barrel , repeat with 320 , clean the 600 , then clean . lastly , tooth paste and stroke this 100 times  which is very fine , This is how I do it

    Some like fire lapping , others like using a tool with very fine sand paper , this method is what I have used  for ultra long range guns ,2500+ yards So I know how it works ,

    then clean again , crown barrel either with cutter , lathe , or if you mcgiver you can use compound and a drill and a brass counter sunk srew lol , next week I shall post some groups with this barrel , LOU

     

     

     

     

     

                                                

     

    .polishing bore with tool u made and grit

    old cleaning brush

     

       cast u made           

     

     

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    BlackICE
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    Great idea I thinking of the same thing. I like your method of casting a lead slug to polish Barrel. I was thinking of doing the barrel to shoot h&n Grizzlies to just below the speed of sound. I don't know how accurate these slugs would be but the Price Is Right and they are light enough to possibly to go over thousand feet per second. I love the ballistic coefficient of these.

    I have to CNC lathe so I thread the barrel using it. I know the powder burners people use a chamber reamer to cut the chamber and lead in of the barrel. I was thinking of using a boring bar to cut the lead in to the rifling. And was wondering how best to polish the machine works out. Now I know. I guess lead in can be tuned to one particular slug or generalized with a longer lead in. My understanding is that it's best to have the slug pushed  in just so the front of it kisses the rifling.

    I look forward to your results and valuable information before I proceed.

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    davidsng
    Participant
    Member

    I was thinking of doing something like this to one of my guns, but Im too afraid to screw it up.  Please lost your results. Thanks.

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    jwrabbit123
    Participant
    Member

    Hi Black Ice , correct for cambering for slugs  you want to measure your longest slug only the part that is full size , and Hone it .0005 ,just for ease of loading you do not want to hone further you want it to insert and hold in rifling .

    Me what I do is make a cast measure it and make my ammo .0005+ . it needs to bite rifling , I use also only 6 bhn lead for expansion and also to grab rifling better .If u use a lather finish off with steel wool and like 600 for cleaning up chamber and crown

     

    here is my barrel all done , Just waiting on a pilot to crown it ,

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    Cranky1
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    Did you go with a poly barrel? I would like a poly barrel setup for mk2 heavies

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    BlackICE
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    The LW Poly barrels come in a much larger diameter would have to be turned down quite a bit whereas the normal rifling barrels are 12 mm diameter from the factory in a perfect fit.

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    Michael
    Keymaster
    Keymaster

    @jwrabbit123

    Good topic, I've got a .25 Supermagnum & it shoots the 34g JSB like a laser beam @ 900 fps.  The reg is set to a measly 112b & the HST is really low.  This thing is a BEAST!  And it's only 34" long.  250b fill, 56 shots at 60 ft lbs.

    I read somewhere that you tried NSA slugs but they didn't perform well, so I ordered some Aeromagnum & Rat Sniper slugs.  I'll let everyone know how they shoot after the holiday.

    Cheers 

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    jwrabbit123
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    I said I tried 15 types of slugs and I was not happy with 1 of them . I never gave up , However like you Michael  I shot mine at like 100 bar for mk2 anything out to 150 yards , but I just couldn't get it to group , I had to make slugs .002 smaller then normal for my barrel . I dont know if any of the other guns is same as mine /.

    But set my reg at 100 bar and I can shoot MK2 like a lazer out to 150 yards

    I can say this , My ed-gun muzzle was .246 the breech is like .2473

    the new LW blank is .249 at both ends , but in 2 parts it is .249.8 , do not ask me why I checked it 100 times

    Soon I try to shoot it .either I will be happy or cry for a machinist here to make one lol

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    jking
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    JW, so when you insert the cleaning rod with the cleaning brush that has been debrushed are you saying your pushing it all the way through to the other end and pouring the lead in from that end as well? What keeps the lead from falling past the brush? Probably a simple explanation but I'm not following. Are all the Edguns threaded on both ends?

    Great post by the way… +1 to ya

    jimmy

     

     

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    Hekk187
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    The 40 grain large hollow point slugs that D-Rig makes ,shoot at 875fps through my R5 magnum nicely…hitting 22 rim fire gophers at 150 yards consistently and still getting 725 FPS at 100 yards. It shoots the Ratsniper 36.4 grain skirted slugs good  at 915 FPS and the jsb 34 grain mk2 pellet at 955 FPS.

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    jwrabbit123
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    Hi Jking I do with with any rifle , any bore size , Yes in this case the old cleaning  brush is where the lead with stop and harden on the wires on the old cleaning brush ,

    If I was doing a .50 caliber I mite  put a puck of some kind 1 inch down bore and tap threads for a cleaning brush , also I a 25 and a 30 both threaded both ends , the leshiy I got has no threads , I dont know about others Brian at Edgun West is the pro  on anything Edgun .

    I just want a tool with a perfect cast size to do my  hand polishing . this makes a huge difference in long range shooting , any minute detail all adds up down range , any improvement even small is huge down range , when you looking for accuracy 1 shot 1 hit ,

    so paying attention to details show up on targets.

    Hi Hekk awesome , can you post where to get slugs i like to try them . also you have a R5 bolt action you shoot slugs out of at 150 yards ?? is this a 25 or a 30 caliber ?

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    Hekk187
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    D-RIG is a member on this forum…. he makes the Varmint Knocker Slug, you can just message him directly.

    The rifle is a R5 .25 long magnum bolt action, one of the handful based on the .30 platform. I was told that the Nielson Ammo fits too tight by Brian at EdgunWest.. But these Varmint Knocker Slugs fit and shoot nicely.

     

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    jwrabbit123
    Participant
    Member

    ok thnks hekk187 I tried nelson to , to tight in mine to  this is why I am trying an unchoked barrel  , I am waiting on my crown cutter from Brownells to try it .

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    Michael
    Keymaster
    Keymaster

    I just received some slugs from Rat Sniper.  I plan on testing (after Turkey day) the .22 in my Redwolf HP & the .25 RBT in my R5 Supermagnum.

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    AirSupply
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    Look forward to seeing how the slugs go in the RedWolf. I lot of Daystate owners have had success with the slugs but the RedWolf is a bit different with it 1:16 twist rate. It should work well as it’s the same twist rate as the Huben and it shoots slugs well. Shoots the redesigned monsters well also. 

     

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    jwrabbit123
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    Hi air supply  which gunhas 1:16 ? isnt is 1:17 in the 22 ?

    I would think 1:16 would be better  for a slug barrel as you can shoot stable at higher speeds

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    JWilson
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    Michael

    I just received some slugs from Rat Sniper.  I plan on testing (after Turkey day) the .22 in my Redwolf HP & the .25 RBT in my R5 Supermagnum.

    Really looking forward to the Supermagnum results.

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    AirSupply
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    jwrabbit123

    Hi air supply  which gunhas 1:16 ? isnt is 1:17 in the 22 ?

    I would think 1:16 would be better  for a slug barrel as you can shoot stable at higher speeds

    The RedWolf hp.22 has a custom barrel for Daystate from Lothar Walther . It’s a polygon barrel with the 1:16 twist rate. It does have a choke. It should shoot the slugs well but I haven’t seen anyone’s results yet. I’m keen to try them but it’s a bit of messing around to import them to Australia. 

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    jwrabbit123
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     Ok thanks for clarifying this air supply , you mean a combination of a choke and poly  barrel with a 1: 16  .

    I had to ask as I want to try a 1:16 in  for my next slug build

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    BlackICE
    Participant
    Member

    I've been reading up on shooting slugs and the consensus seems to be that the slugs should be sized to match the groove diameter of the barrel. The standard LW barrel as a groove diameter of 0.254 which is larger than most standard slugs you can buy. Of course you can always cast size your own, but a lot more investment of time and $. I did find that a 25 ACP TJ barrel liner that has a .250 groove diameter that matches most available slugs on the market. However the diameter of this liner is only 7/16" or 11.11mm, thus being too small to thread to M12x1.25mm. However you can machine the end and thread on a sleeve to allow both end to be threaded to the correct size. The TJ liners are hammer forged, would turning the OD smaller to sleeve it adversely affect the bore size?

    https://www.lothar-walther.com/barrel-blank/airgun/standard-profile/86/airgun-blank.25-air-od.47-l-23.82?c=273

    In the meantime I'm awaiting your test results as theory sometimes doesn't match reality and your accuracy may be more than acceptable.

     

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