Like the title says I bought a standard ST 700mm barrel fo replace my old .25 barrel that couldn't group for nothin.
alright so I've done a little tuning ttrying to figure the best speed and all that good stuff for the 34 grainers. And so far it a hell of a lot better than my old barrel. I'm getting less than half inch groups ar fifty no problem. Haven't got to shoot further yet winds are in the 20s today.
So before with the 600mm barrel I had the gun set to 130 bar and was shooting about 840 and power 3 and I have the valve on 3 also. Posted good 50 yard groups but had a very erratic spiral past that and I just couldn't fix it..
Now with the 700mm barrel on the same settings the velocity was 910fps! That seems like a hell of a lot to me! But hey I'm not complaining. Accuracy off course was horrible with that tune.
so yesterday iset off to dial it in. Ran it over the chrony and seen it was way hot and started the tuning process.
I started by lowering the reg until I got where I thought was good. Now I have the gun set at 105 bar power on 3 valve still on 3 and its shooting 860fps very accurate! I'm pretty excited to see if the shot count goes up and to actually shoot a full shot string. So far I've only shot about 40 over the chrony. (High-865. Low-855)
when I have time to shoot some groups and what not I'll post the pics.
I'm not the the smartest when it comes to tuning so I'm not sure there is still things to change
alright so I've done a little tuning ttrying to figure the best speed and all that good stuff for the 34 grainers. And so far it a hell of a lot better than my old barrel. I'm getting less than half inch groups ar fifty no problem. Haven't got to shoot further yet winds are in the 20s today.
So before with the 600mm barrel I had the gun set to 130 bar and was shooting about 840 and power 3 and I have the valve on 3 also. Posted good 50 yard groups but had a very erratic spiral past that and I just couldn't fix it..
Now with the 700mm barrel on the same settings the velocity was 910fps! That seems like a hell of a lot to me! But hey I'm not complaining. Accuracy off course was horrible with that tune.
so yesterday iset off to dial it in. Ran it over the chrony and seen it was way hot and started the tuning process.
I started by lowering the reg until I got where I thought was good. Now I have the gun set at 105 bar power on 3 valve still on 3 and its shooting 860fps very accurate! I'm pretty excited to see if the shot count goes up and to actually shoot a full shot string. So far I've only shot about 40 over the chrony. (High-865. Low-855)
when I have time to shoot some groups and what not I'll post the pics.
I'm not the the smartest when it comes to tuning so I'm not sure there is still things to change