My slug gun build – .35 cal. converted to .25 cal. with an index-able barrel.

Forums PCP Airguns My slug gun build – .35 cal. converted to .25 cal. with an index-able barrel.

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    Long_Shot
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    Well here's a few pictures of my slug gun build. 35 Cal Cricket converted to a 25 Cal 
    with a 1 in 22" twist 26 inch long barrel.
     I finally decided I wanted to do this project. Since last year I had bought a mill, lathe 
    and all the necessary tooling for them. Figured I may as well find out where the on button 
    was and make a few parts. I'm no machinist, but there just machines that seem to make what 
    I need without too much trouble. Just slow as molasses that's all.
     So far I've been quite pleased with the build. The finished look is what I was envisioning.
    Best accuracy so far has been the 35 grain 965 FPS to 37 grain at 950 FPS. 
    Shot a few 30.5 grain slugs (my stock crickets favorite) at 1015 FPS.
    Probably just a bit too fast for them. Not the best groups.
    Testing different slugs yesterday was tough because of that wind.
     Well just need to finish making two mags and the LDC for the thing.
    Needs a fixed power scope too. 20X or 24X and ultra-lightweight, to use with the optimizer.


    That stock picatiny rail and the optimizer is too much. Oh well, one more part…….

    UPDATE ! ! !

    Here's how the gun is finished up. 

    Shooting a 38gr. slug at 936 FPS for about 75 FPE has been the best so far. 

    I've shot this gun enough to say that in .25 cal. more FPE makes a BIG difference on consistency at longer ranges. 

    This is my "go to" gun now. I've been so amazed at it's ability to accurately and consistently hit hard out to 225 yards that I made a few Youtube videos to share what a Hot .25 cal. PCP can do. In calm to no wind this video sums it up. 

    This gun build was the best choice for me to have a reliable powerful .25 cal. slug gun. 

    I can still power tune it too!   MORE POWER !!!!!!

     

     

    • This topic was modified 1 month ago by Long_Shot.
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    D-RIG
    Spectator
    Spectator

    Hey Tom , did you use the TJ barrel with the 1:22 twist rate  

    The barrel specks at .243 and .250" I'm just curious . Dale 

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    Long_Shot
    Participant
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    Hey Dale,

    Sure is. Obviously your familiar with that barrel. 

    Bought it 2+ years ago. Don't know if it was the best choice I could have made for this gun. 

    I'm thinking the .250" slugs are too big for this bore. More shooting needed.

    At least I know the velocity ES is only 2 FPS. 

    I haven't got to shoot it under windless conditions yet. Maybe today.

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    D-RIG
    Spectator
    Spectator

    Yes I'm very familiar with that barrel actually I shot slugs with it 

    for 1.5-2 years it is very picky about what you shoot in it and likes

    1,000-1010 fps for the speed with a slut thats 33 grain .

     

    The one thing I found is that when zeroed at 50 yards I needed to 

    add 3 clicks at 100 yards and 3 more at 150 yards and so on and so on 

    I feel that the twist rate is a little slow at 1:22 but the gun does shoot fantastic 

    my longest kill shot is at 224 yards on a GS and it will hit everything at 

    125-175 yards . Sending you a PM with contact info . 

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    JamesD.
    Participant
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    Nice work for just finding the on button. 

    What lathe & mill you get for softer air gun steel & are you limited on barrel blank length?

     

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    Long_Shot
    Participant
    Member

    Dale – I look forward to talking to you about that barrel / slug combo.  Thanks.

    JamesD – A used 1340 Chinese Lathe and a brand new 3hp Precision Mathews Mill. 

    Bought the barrel from Mike Sayers. Any length you want.   Up to 8 feet long. 

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    Long_Shot
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    Just thought I'd try to update this post.

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    IvanM
    Participant
    Member

    Freakin AWESOME……AND the gun looks BEAUTIFUL!

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    knifemaker
    Participant
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    Nice Work!

     

    time to order an NOE sizing set. You will be amazed at just how much more accuracy you can get when the slug is exact match to the bore. I am shooting them at .251 in the current barrel. Just got in a .172 from TJ's for the next project.

     

    For the length of slugs you are shooting, the  one n 20 is a perfect choice. ;<)

     

    Knife

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    Xolotl
    Participant
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    Long_Shot

    I have the following question: What is the wall thickness for the air deposit? Do you know what material is it?

     

    Regards

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    Airgun-hobbyist
    Participant
    Member

    Nice looking and shooting project!

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    Long_Shot
    Participant
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    IvanM – "AND the gun looks BEAUTIFUL!"   Thanks. That's what I had wanted instead of the 35 cal. look, with no wood cheek piece as this photo shows.

     

    Knife – I have another .25 cal. smaller swaging die set being made. You must be planning a .177 slug gun for that TJ  .172" barrel. 

    I was thinking about a .30 cal.gun to make a hot .22 cal. (75 FPE) out of.  But OAL for the mag's. is the problem with most platforms as a start. 

    Xolotl  –  I'm not sure about thickness of plenum area or AT.  But, it's all made out of Aluminum alloy of some type I'm sure. 

    Airgun-hobbyist  –  "Nice looking and shooting project!"   That's how I've felt, especially the shooting consistency.

    Enough so, that I wanted to share with AGN members any info. that may help someone else decide how to address the fact that most "pellet PCP's" are a bit too anemic per caliber to make "good" slug guns out of.  My stock Cricket is a serious sub-MOA with a 30.5gr. slug at 100 yards (52 FPE) but can't do anywhere as well as this gun out past 100 yards.  Slugs work far better with more power and velocity than pellets need. 

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    Airgun-hobbyist
    Participant
    Member

    Airgun-hobbyist  –  "Nice looking and shooting project!"   That's how I've felt, especially the shooting consistency.

    Enough so, that I wanted to share with AGN members any info. that may help someone else decide how to address the fact that most "pellet PCP's" are a bit too anemic per caliber to make "good" slug guns out of.  My stock Cricket is a serious sub-MOA with a 30.5gr. slug at 100 yards (52 FPE) but can't do anywhere as well as this gun out past 100 yards.  Slugs work far better with more power and velocity than pellets need. 

    I am learning that.  And now see that a lot of us evolve in our hobby doing roughly the same pattern!  Because of this I'm serious thinking of going to a lower caliber barrel in the Impact, and getting a dedicated big bore rifle to play around with as well.  

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    knifemaker
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    Long_Shot

    IvanM – "AND the gun looks BEAUTIFUL!"   Thanks. That's what I had wanted instead of the 35 cal. look, with no wood cheek piece as this photo shows.

     

    Knife – I have another .25 cal. smaller swaging die set being made. You must be planning a .177 slug gun for that TJ  .172" barrel. 

    I was thinking about a .30 cal.gun to make a hot .22 cal. (75 FPE) out of.  But OAL for the mag's. is the problem with most platforms as a start. 

    Xolotl  –  I'm not sure about thickness of plenum area or AT.  But, it's all made out of Aluminum alloy of some type I'm sure. 

    Airgun-hobbyist  –  "Nice looking and shooting project!"   That's how I've felt, especially the shooting consistency.

    Enough so, that I wanted to share with AGN members any info. that may help someone else decide how to address the fact that most "pellet PCP's" are a bit too anemic per caliber to make "good" slug guns out of.  My stock Cricket is a serious sub-MOA with a 30.5gr. slug at 100 yards (52 FPE) but can't do anywhere as well as this gun out past 100 yards.  Slugs work far better with more power and velocity than pellets need. 

     

     

    Yes Sir! I have .223, .250, .257, and now .172 TJ barrels. One .257 TalonDor, and one A Raintorm II with all the barrels. The TD is a 190 fpe gun, the Rainsortm can go from 60 to 95 fpe. ;<)

     

    All barrels are fire lapped bore polished. I love a good TJ Barrel!  :<) x 2!!!

    Knife

     

    Yep, gotta have a flier! .250 RS II at 80 1/4" before the flier.  yards  GRRRR!!!

     

     

     

    • This reply was modified 1 month ago by knifemaker.
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    Long_Shot
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    Knife  –  the Rainsortm can go from 60 to 95 fpe. ;<)  Wow. 95 FPE with a TJ barrel in .25 cal. that's cool. 

    You meantioned : All barrels are fire lapped.    

    That's what Micheal  Hossach  (Rat Snipers)  suggested for the TJ barrel.  What brand lapping system did you use? 

    I've had a leading issue I want to eliminate. I made and fired a copper based slug through it yesterday to help clean out the leading.  

    Going to put a few more copper base slugs through it today. Then check for any signs of leading. 

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    Dairyboy
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