Umarex Gauntlet SL30 help

[Johnny Mac]

I recently acquired a Gauntlet SL30. I originally shot it in the factory stock with JSB 44.74 and 50.15 pellets. I didn’t record my groups but I was quite pleased with the accuracy. 50 shots with the 50.15 averaged 977fps and a whopping 107ft/lbs right out of the box. I swapped it into a Hajimoto/Buck Rail chassis but did NOT add a barrel band. I took it out the last couple days and accuracy was pretty terrible. I thought maybe it was far too fast for pellets and tried to turn down the power via the screw at the back of the receiver, I found the screw was already maxed out in the counter clockwise direction and turning it clockwise resulted in even higher velocity, well over 1000fps and turned in about 10 full turns, after the shot the valve remained open and I had to cock the rifle to stop air escaping, so I’m assuming full clockwise is the LOWEST hammer spring tension I can set and is still more power than I really want-I was shooting fully through my rubber stall mat backstop. I do intend to try slugs in this rifle, but is there any way to reduce power from current minimum stock levels without tearing deep into the gun? And am I pushing pellets too fast or do I just need to add a barrel band like the factory stock had to regain accuracy?

 

[JaceSpace1369]

I recently acquired a Gauntlet SL30. I originally shot it in the factory stock with JSB 44.74 and 50.15 pellets. I didn’t record my groups but I was quite pleased with the accuracy. 50 shots with the 50.15 averaged 977fps and a whopping 107ft/lbs right out of the box. I swapped it into a Hajimoto/Buck Rail chassis but did NOT add a barrel band. I took it out the last couple days and accuracy was pretty terrible. I thought maybe it was far too fast for pellets and tried to turn down the power via the screw at the back of the receiver, I found the screw was already maxed out in the counter clockwise direction and turning it clockwise resulted in even higher velocity, well over 1000fps and turned in about 10 full turns, after the shot the valve remained open and I had to cock the rifle to stop air escaping, so I’m assuming full clockwise is the LOWEST hammer spring tension I can set and is still more power than I really want-I was shooting fully through my rubber stall mat backstop. I do intend to try slugs in this rifle, but is there any way to reduce power from current minimum stock levels without tearing deep into the gun? And am I pushing pellets too fast or do I just need to add a barrel band like the factory stock had to regain accuracy?

From what I have seen I'm the videos, the 50.14gr pellets don't like going that fast, bringing them down to 900-930 they shoot better. You're reg is likely set a lot higher than what it states if at low spring adjustment it's doing 107fpe. You're likely better off getting some griffin slugs to shoot then out of the gun. The 78gr will be going around the 800-830fps mark but they shoot really really well! If you do not have a moderator on the rifle you will likely atleast need one to combat the barrel whip since you don't have a barrel band.

My g30 has the reg set to 3100psi and it was putting out 92fpe with the barrel cut to 20" and the hammer string being most of the way in, but still with enough adjustment left. So I'd assume yours is somewhere around the same pressure.