Benjamin Bulldog 290fpe Beast Mode

Forums Big Bores & Arrow Shooters Benjamin Bulldog 290fpe Beast Mode

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    thammer
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    Bulldog Beast Mode

    290fpe 3 shots 16fps extreme spread. 

    145gr Noslers ran 948, 960, 944 fps

    Opened up the transfer port size to 5/16", Reshaped the poppet head and removed the return spring.  Shortened the factory hammer spring to 2.4", added a 10.5 gram brass hammer weight .400" in height and put a gauntlet spring inside the factory spring.  Filled the guns upgraded airtube to 3650psi and fired 3 shots with Benjamin Nosler 145gr slugs.

     

    Do not fill a factory air tube beyond 3000psi.

     

     

    • This topic was modified 5 months ago by thammer.
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    Fasyankee
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    Stock reservoir?  Any other details on the build?  Any other non-stock modifications?

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    thammer
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    Fasyankee

    Stock reservoir?  Any other details on the build?  Any other non-stock modifications?

    Upgraded reservoir everything else is listed in the details. 

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    T3PRanch
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    For the newer shooters that read this thread …. DO NOT fill the factory air reservoir beyond 3K PSI!

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    zephlin
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    Has anyone tried the all copper controlled fracturing bullet by Lehigh Defense? It's fits the stock magazine and is my first purchase after I order a Pitbull. lehighdefense.com/all/357cal-38cal-105gr-controlled-fracturing-bullet

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    redlined_b16a
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    zephlin

    Has anyone tried the all copper controlled fracturing bullet by Lehigh Defense? It's fits the stock magazine and is my first purchase after I order a Pitbull. lehighdefense.com/all/357cal-38cal-105gr-controlled-fracturing-bullet

    They are machined brass and copper,$40 for 50 rounds and will probably damage our soft steel air rifle barrels.Alot of friction for our low psi airguns.

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    Kinetic45
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    Actually, the .355 version WILL shoot in a modified Bulldog (a Pitbull) especially if you coat it with the John Deer Graphite Lubricant. Two coats.

    https://www.lehighdefense.com/index.php?_route_=all/355cal-9mm-105gr-controlled-fracturing-bullet

    https://greenfarmparts.com/shop/john-deere-lubricant-spray-ty25797/?gclid=EAIaIQobChMIouGV2Pzf5wIVA6SzCh2bzAbFEAQYASABEgJa0vD_BwE

    I've only shot it from a full fill and then only two shots (sort of afraid of a stuck bullet at lower pressure) but did get acceptable/expected velocities and 1/2" to 5/8" 'groups' (shot two, refill n shot two three times for a six shot 'group') I shot 30 shots in my testing with these bullets and don't think there is any barrel damage…. Honestly, for a lot of years I said it couldn't be done and we could only shoot soft lead projectiles so when UpNorthAirgunner did his videos I had to test it for myself.

    Note this was at 50 yards but most of my hunting is 85 yards or less so I thought it was good. I also fill to 3200 which is an overfill but since I noticed a 3000 fill at 72 degrees goes to 3400 at 90 degrees in the afternoon I "evaluated the risk and safety factors" and believed the engineers designed the gun to allow for a cool morning fill and the increase in pressure as the day warmed. You have to decide for yourself if that's an acceptable safety risk.

    • This reply was modified 5 months ago by Kinetic45.
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    JeffDodge
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    Sick! Nice work Troy!

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