Hi Guys,
Two years ago I bought a Jkhan Noblesse Bullpup in .25 cal to install a regulator and test the performance. It was really a nice setup and it was very very accurate. I ended up selling it because I had too many guns and I didn't buy it to keep, it was just for testing the performance of the HUMA regulator. Anyway after some months later, the gun just kept popping up in my head. So I called over to the distributor and asked if they had any of those JKhan bullpups left, but they only had it in .357 caliber. I was told it was the only Jkhan Noblesse Bullpup they had in stock. Well it wasn't what I wanted as far as caliber desired, but I figured it will have to do. I always like to experiment. This time I would test the HUMA reg shooting the gigantic .357 cal. Well long story short, I tested it, it was cool, but I was never going to shoot that behemoth. I was able to get around 800fps with the JSB .357. This was with some heavy modification. I think I was able to shoot a full magazine (7 rounds i think) before velocity/consistency dropped. Fast forward several months later. The gun now is a .25 caliber rifle. I modified a Smooth Twist .25 cal 21 inch barrel to fit the action (this barrel was bought around 3 yrs ago). After modification I ended up with 19.5 inches of total barrel length. I took it out today and got pretty decent groups, but nothing spectacular. I think with the JSB 25.4 grain pellet I am pushing nearly 930 fps. I could get more power if I wanted, but I wanted to keep the velocity below 950fps with these lighter pellets. During testing in the shop I was getting 900 fps with 33 grain JSB with the power turned all the way up, and reg set at 145 bar. So maybe If I turned the power down it would be more accurate, or check other pellets to see which is more accurate. Some investigating is definitely in order. However, at 60 yards, I was able to cover 3 shots I took with a nickel. None of the pellets touching each other. Usually my BSA scorpion .25 cal will stack pellets at 60 yards, so my expectation for accuracy hasn't been met....but I think it will....eventually. It could be my ST barrel, and the fact I'm shooting to fast or slow...Next time Im in the shop I'll take some pictures of the ST barrel in the action. I also had to modify the pellet probe and change out the hammer spring. I hope to shoot this gun at ground squirrels ranging out to 100 yards.
