My first Sumatra

Forums PCP Airguns My first Sumatra

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    NeilClague
    Spectator
    Spectator

    I just picked up a nice 22 caliber Sumatra from my good friend Lee Chiu, after installing a scope and making a smaller LDC for it so I could test it in my back yard I was ready to go. I was really surprised at the power and accuracy of this gun, I had not realized just how powerful they are. I shot a few magazines at 50 yards and was getting a ragged one hole group. The air got low so I went and filled the gun, the first shot let out an almighty crack, it must have been on full power and it was enough to give me a supersonic crack with 18.1gn pellets. After dialing it down just a notch it was under the sound barrier and the smaller LDC was working great, the impact was louder than the report and should be good enough not to upset my neighbors. 
    I am really impressed with the accuracy and power of this gun, I am sure it is capable of going out a lot further than 50  yards, before I had the scope sighted in the first pellet struck the bottom of my very heavy target and put a very large dent in it, my other guns would just leave a small mark on it, it must be putting out a lot more power than my 34fpe Pneuma;s and AAS410. 
    It might be a bit more than I need for my target shooting but I really needed to get one for my prototype work, I would highly recommend this gun to anyone who wants an accurate gun for hunting smaller critters out to 50 yards and more, Neil.

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    blackdiesel
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    Manny and I along with a few others have been carrying the Sumatra banner for awhile.  I regularly plink at over 120 yards with all 3 of my Sumatras.  I have 32 yards in my backyard and on any day I can make 1 very small hole shooting it.

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    NeilClague
    Spectator
    Spectator

    That does not surprise me after the time I just spent shooting the one I just picked up. At 50 yards it was on par with the guns I use for target shooting which really surprised me from a gun designed primarily for hunting, what an amazing gun, I am really impressed with it, Neil.

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    travels4fun
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    Neil,

    The Sumatra is one of the guns i would love to try someday. The .25 would be my choice for all around plinking and long distance target shooting. I have been keeping my eyes out for someone selling a used Sumatra for the last few months to no avail. Anyway, enjoy your new rifle. Post some pics if you have a chance.

    Scott

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    NeilClague
    Spectator
    Spectator

    Here ya go Scott, I tried a smaller LDC on it to start with which is the one in the picture. I tried one of my slightly larger ones I made for a customer on the gun and it made a big difference so a larger one will be made for it when i have more time. The one on it is back yard friendly but not as quiet as the next size up. 

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    blackdiesel
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    Make sure you use a chrony to adjust the power.  My 22 cal fires the 18 gr JSB pellets at 970 fps with the power wheel set to the first green dot.  I think it’s 4 clicks out of 13 clicks.  Anything higher and it’s too hot.  

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    NeilClague
    Spectator
    Spectator

    I don’t have a Chrony and my dots are Red, Blue and Black. I had to dial it down slightly because I was getting a supersonic Crack but now I have it set where I like it and will most likely keep the power adjuster where it is, thanks, Neil.

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    blackdiesel
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    Ok that’s the older model.  I have one with those colors and two newer models with the black, green and red dots.  There should still be 13 or 15 clicks on the power wheel.  

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    Ted
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    I have yet to hear a scathing review of a Sumatra.  Everyone who owns one loves the darn thing.  :)
    I would like to know if they have a proper shot curve (bell shaped).  My issue with the Evanix line is that the first shot is always the hottest, and it slopes downhill from there.  It says to me that the hammer and valving are not in harmony.  

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    blackdiesel
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    If you shoot it with the power set to the highest the first couple of shots will go up before quickly falling.  But here’s the kicker the only pellet that doesn’t shoot hot with this setting are the 43 gr Eun Jun pellets.  On my 25 cal I have to set the power at 6 out of 13 to keep the 31 gr Barracuda pellets under 1000 fps. With the power set on 6 it has a nice curve and I get about 18 shots.  With my 22 cal I use the 18 gr JSBs and can get about 24 shots from 2900 -to 2000 psi.  

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    Nomadic Pirate
    Blocked
    Blocked

    Sumatra’s rock !!! …my all time favorite Airguns :)

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    NeilClague
    Spectator
    Spectator

    Manny I have just tried it out to 60 yards with a target made for PB’s, with the power on full the thing was making a supersonic crack and the pellets really whacked the target, I had got the lighter pellets in it and did not realize they were only 15.8gn and not my 18.1gn that I had used before.  I turned it down a bit and still the pellets are leaving indentations in the 3/8th steel paddles, this thing sure has some punch behind it. Now I can see why you like them for hunting! Neil.

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    npunk42
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    The only downside of the Sumatra is how loud they are. When you really should wear ear protection shooting an air rifle, that’s too loud.

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    NeilClague
    Spectator
    Spectator

    With one of my moderators on them they are almost as quiet as a Marauder, even with the smaller diameter one in the picture is very backyard friendly, Neil.

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    blackdiesel
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    I put foster fill adapters on mines so I cane go straight from a female cable and ditched the fill probe.

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    Targetor
    Participant
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    Hi guys,

    First time posting here.  I have the .22 cal carbine version. I really like it.  With the power wheel at its lowest setting, its shoots JSB Monster 25.4 grain pellets at an average of  949 FPS for the 1st 6 shot clip (50 ft/lbs of ME, ES of 48, SD is 19) and 896 FPS for the 2nd clip (45 ft/lbs of ME with ES of 58, SD of 22).  I put a foster adapter on it last month (finally!!) as the original probe’s O rings were getting worn from filling.    I’m waiting on some Straton Monsters to run them through the chrony. The shot strings run high to low – I haven’t found a bell curve yet.

    Cheers ………. Dan
     
     

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    NeilClague
    Spectator
    Spectator

    Wow that’s shooting pretty hot with 25.4grain pellets. I don’t have a chrony so I have no idea what mine is shooting them at, I do know that I really had to back off the power wheel when I loaded some 15.8 grain pellets by mistake, the crack shooting them was awful, I felt sure I was going to get a visit from someone in uniform, lol.  I wonder how many cops will believe I was just shooting an air rifle. I was given the choice between the carbine and the full size gun but chose the larger on, I felt sure the carbine was going to have a low shot count maybe I was wrong! I will try it on full power with some 21 grain pellets and see how they work, will post more later, Neil.

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    Nomadic Pirate
    Blocked
    Blocked

    The only way to do justice to the .22 Sumatra at high power is to use the 32gr EunJin, great accuracy from that pellet.

    The 28gr Eunjin is pretty good too.

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    blackdiesel
    Participant
    Member

    “NeilClague”Wow that’s shooting pretty hot with 25.4grain pellets. I don’t have a chrony so I have no idea what mine is shooting them at, I do know that I really had to back off the power wheel when I loaded some 15.8 grain pellets by mistake, the crack shooting them was awful, I felt sure I was going to get a visit from someone in uniform, lol.  I wonder how many cops will believe I was just shooting an air rifle. I was given the choice between the carbine and the full size gun but chose the larger on, I felt sure the carbine was going to have a low shot count maybe I was wrong! I will try it on full power with some 21 grain pellets and see how they work, will post more later, Neil.

    
I can tell you that on the third click the 15.8 gr pellets are in the 900 fps (around 940 fps).  On full power they are over 1100 fps. 

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    NeilClague
    Spectator
    Spectator

    Thanks Manny I will see about putting an order in for some now that I have a gun powerful enough to sling some heavier lead down field, all the best, Neil.

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