Airgun Technologies Uragan 2 .22 tuning

RodrigoR · Oct 29, 2023

Hello, I did some tests with the spring adjustment but it doesn't seem to have much effect. Follow the data Uragan 2 700mm .22 huma air reg at 140bar slug 29gr .217
The top number is the weight of the slug, and the bottom number is the number of turns from the bolt flush to the block.
shots at 56 meters
Any tips on how to improve?

Emu · Oct 29, 2023

Reg should be about on a .22 Cal at about 90-110 bar.

On my Vulcan 3 .30 Cal reg is at 140.

WorriedMan · Oct 29, 2023

Haven't made adjustments to my U2, read that "balanced" valve won't be affected to hammer adjustments. WM

Macros · Oct 30, 2023

The speed on the gun is essentially entirely determined by the reg pressure. The hst just has to be 'enough' to open the balanced valve.
The poor accuracy likely relates to more than the velocity though, as all the ones I have set up have shot very well in that range.
One issue the ones I have come across had is a 90degree, sharp transition to the rifling at the lead. Once that is dressed to a smooth 15 or so degree 'ramp' type transition there was a massive improvement to accuracy and the rate of fouling, as well as the feel on loading.

The silver you see at the rifling transition in the pic is actually lead shorn off of the slugs on loading.

Another is to maybe try the 28gr 0.217 Zan if you haven't. They have generally been best in these guns of everything I've tried, and usually very close to the reg pressure your gun is at, shooting around 960fps.

RodrigoR · Oct 30, 2023

Note that with 4 and a half laps I had a spread of 9, but after continuing with the tests, when I went back to 4.5 I had a spread of 21. Nothing seems to follow a pattern.

RodrigoR · Oct 30, 2023

Macros said:
The speed on the gun is essentially entirely determined by the reg pressure. The hst just has to be 'enough' to open the balanced valve.
The poor accuracy likely relates to more than the velocity though, as all the ones I have set up have shot very well in that range.
One issue the ones I have come across had is a 90degree, sharp transition to the rifling at the lead. Once that is dressed to a smooth 15 or so degree 'ramp' type transition there was a massive improvement to accuracy and the rate of fouling, as well as the feel on loading.

View attachment 401265

The silver you see at the rifling transition in the pic is actually lead shorn off of the slugs on loading.

Another is to maybe try the 28gr 0.217 Zan if you haven't. They have generally been best in these guns of everything I've tried, and usually very close to the reg pressure your gun is at, shooting around 960fps.

Thanks, I'll try,

RodrigoR · Oct 31, 2023

I have the African Airgun upgrade kit, but I didn't install the stronger spring, would it help?

Macros · Nov 2, 2023

Nope. That spring is totally unnecessary unless you jack the reg pressure up to ridiculous 200+bar levels. A friend tried that and his valve started leaking in no time flat.

Motorhead · Nov 2, 2023

Yup, having a balanced valve, power is a regulation set point issue / adjustment

RodrigoR · Nov 9, 2023

This is proving difficult to adjust. I installed a human air regulator, it is at 150 bar, with energy of 57foot-pound. The spring adjustment does not change power, but it may reduce the spread a little, if I leave it close to the block the spred reaches 30, with an ugly sound, it sounds like a sneeze, if I add 5 turns, the spred drops to 19, improving the sound for something like a dry stamp. Regarding the slug, it seems that the thicker the better, but then I had a type to test