BLACK MAMBA: FX IMPACT "DETUNING" BenchRest 25y

Forums Benchrest Benchrest Talk BLACK MAMBA: FX IMPACT "DETUNING" BenchRest 25y

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    nomojo65
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    Wow!, that surprising to me I thought you could get 900fps with 10.3’s but glad you Could get get it under 12ftlbs, is it Accurate at those speeds? my goal is 13.4’s at about 820fps?

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    edosan
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    Do not get me wrong

    You can for sure, I have my reg in 90 bar, and I do not want to take it higher, if I can shoot a 18.2 gn 0.22 at 950 and changing the cal only I shoot the .177 @ 850 means that the caliber is the restrictor. I can take the reg up or make the .177 transfer ports bit larger (like it better) and bit more efficient.

    I will put on hold my mods since this weekend and next I have a few BenchRest comps. But after that I will keep testing and getting more .177 pellets to test. 

    in the meantime: https://www.instagram.com/p/B32UAAsCQgg/

    and

    https://www.instagram.com/p/B34MiWJAV3n/

    • This reply was modified 4 months ago by edosan.
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    nomojo65
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    Nice you have both large & small flags! I have just the small for 25m, they react really fast I never tried the wind meter I think they would very valuable? Should probably pick one up over the winter, still waiting for my 500mm barrel? Still experimenting with my friends! Weather not cooperating! 

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    edosan
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    The wind meter looks pretty good, I like it, you can adjust it as you wish. I will use it next week 👌

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    edosan
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    Today I manage to make the mods and speed went up from 850 to 910, but accuracy with the jsb 10.3 gn is just not there. Test from 800 up to 910 no luck, groups over 1 inch @ 30yards. Next week I will get a bunch of other jsb in different weights for testing.

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    nomojo65
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    Ok, just got word my impact in.22 just arrived pick it up mon.-tue, .177 barrel? I have the 600mm barrel in.22 friend of mine says he’s have good luck with jsb redesigns 13.4’s but pushing them to fast for HV, would have to shoot open!

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    edosan
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    In the meantime, black mamba has been busy:

    :D

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    Centercut
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    edosan

    Today I manage to make the mods and speed went up from 850 to 910, but accuracy with the jsb 10.3 gn is just not there. Test from 800 up to 910 no luck, groups over 1 inch @ 30yards. Next week I will get a bunch of other jsb in different weights for testing.

    Wow. that's not encouraging…  Have you polished the barrel yet?  I was told about two years ago that the .177 STX barrel isn't that good.  In fact, I was told that the older ST barrel was better in .177 than the newer STX.  I currently have an .177 ST 500mm barrel that was modified to fit the FX Crown. Its "pretty" accurate, enough for Field Target, but not that great for 25M BR, as the best I've shot with it is in the 715 to 720 range.  Maybe FX has improved the .177 since then, but I haven't heard so.  Perhaps you'll need to shift to a .177 LW Polygonal barrel in your Impact for 25M?  

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    sonny
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    Just out of curiosity have you tried under 800?

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    edosan
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    The shape of the 10.3gn is weird tho, need to test more, next week I will have almost all weights in.177 on jsb, i believe is the pellet. 

    I will try the 800-650 range too

    I am looking for a lw poly 12 grooves already, if any of you have one, let me know.

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    nomojo65
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    I’m taking a little different approach! My idea was to shoot in competition with a stock Impact (maybe some external add on’s for better control) in either .22 or .177 depending on ftlbs ?in 25m and 50yds Probably have to shoot open in both distances 13.4’s in 25m 18.1’s in 50yd don’t think the 600mm barrel will push the 25.4’s fast enough? (10.3 to light for me! Not good enough at reading conditions for those!)

    • This reply was modified 3 months ago by nomojo65.
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    edosan
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    latest stock mk2 will be ok for 25.4 gn monster redesigned @ about 900+fps. You can take the speed down with the valveknob on the impact, if all is in minimum and still need less fps. That is the good thing about the impact, lots of adjustability. 

    Yesterday in another benchrest competition I end up in open class, shooting the 18gn jsb 0.22 cal @ 890fps with 246 points on gusty but light wind. Hopefully I will get my .177 pellets this week to continue my tests with BlackMamba on LV and HV categories!

    • This reply was modified 3 months ago by edosan.
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    nomojo65
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    I want to shoot the 25.4’s @ 50yd comp’s and in the past (out of RW anyway) you have to push them above 930fps to stabilize them quickly? I really want to shoot the redesigned 13.4’s in .177 but again have to push them so both comp’s would have to shoot open class! But both pellet weights I believe the FX barrel is well suited for this experiment?

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    Centercut
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     I'm not sure about the 50Y BR and how the rules and classes compare to 25M.  But in 25M, Open Class is limited to 35 FPE.  If you were to shoot the RD Monsters at an accurate speed, you would be WAY over the 35 FPE limit, and in fact be shooting Unlimited (which a lots of clubs don't recognize).  I know at the Temecula CA Airgun Club, we don't allow anything above Open Class.  

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    edosan
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    nomojo65

    I want to shoot the 25.4’s @ 50yd comp’s and in the past (out of RW anyway) you have to push them above 930fps to stabilize them quickly? I really want to shoot the redesigned 13.4’s in .177 but again have to push them so both comp’s would have to shoot open class! But both pellet weights I believe the FX barrel is well suited for this experiment?

    IME with monsters redesigned 0.22 and fx impact x and mk2

    600mm A liner Barrel OK @ any speed 800-1000 fpe

    700mm A liner Barrel NOT OK, spiral and not stable

    700mm SlugLiner OK @ any speed 800-1000 fpe

    • This reply was modified 3 months ago by edosan.
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    Strever
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    Mike

    you do know that the 50 yard unlimited class for Air Rifle has been added for world competition and they still do not recognize our open class ?

     

    Centercut

     I'm not sure about the 50Y BR and how the rules and classes compare to 25M.  But in 25M, Open Class is limited to 35 FPE.  If you were to shoot the RD Monsters at an accurate speed, you would be WAY over the 35 FPE limit, and in fact be shooting Unlimited (which a lots of clubs don't recognize).  I know at the Temecula CA Airgun Club, we don't allow anything above Open Class.  

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    Centercut
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    Didn't know that….  Interesting. Shooting a 50 FPE gun is definitely an advantage.  LD doesn't allow over 35 FPE at our monthly matches.  He says he wants skill to win, not the matches turn into a power race…

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    edosan
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    Finally, food for BlackMamba 500mm stx

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    nomojo65
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    Well, I guess I’ll have to shoot unlimited! Open or unlimited doesn’t really matter to me! I’m just playing around to see if it’s competitive  either way “stock” Like I said in a earlier post 25m hv is where I normally shoot and I’m not very good at that! (And yes my club is a USARB sanctioned and recognizes unlimited classes in both disciplines)

    • This reply was modified 3 months ago by nomojo65.
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    edosan
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    Open with 0.22 cal is 100% competitive IME with the 700mm A liner (stock), I have a friend that has made 250 with the same setup (outdoors)

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