My guess is the .250 is slightly tighter in the barrel thus making full use of the air pushing it out of the barrel. With bullets on the firearms side, how efficient the bullet is when on its flight path is called Bullet Coefficient or BC’s.Im curious as too what the BC’s are on these pellets are.Could it be that the .25’s have a higher BC than the 30?Could be a possibility
@@Piupiu68az yes I thought about that, but they also go easier into the magazine. So I think there is something with the .249 slugs. Also looking at the colour difference...
What speed did it have at that final group. Also can you explain more about tuning with new new air valve adjuster. Explain how you are tuning in detail.
@@bkmahaffey Last groep was +/- 970 fps. What I do is, I tune the speed mostly with the regulator. Sometimes the hammer spring needs one or two turns in,after the regulator pressure has been increased. I set the hammer spring so that it just opens the valve and then 2 turns extra in. This way the velocity is most consistent. After that I use the valve dwell time adjustment to make small adjustments. When you set the valve dwell time too high, you can hear a difference in the shot (Don't know how to explain, but it sounds like too much air is coming out). I didn't try to set the same speed yet with high reg and low dwell and vice versa. Maybe an interesting idea for a new video to check how much air is used in each shot with the different settings. I didn't set the regulator above 150 bar yet I think. Between 80 and 135 bar you can shoot 28 to 38 grain from 800-1050 fps.
My guess is the .250 is slightly tighter in the barrel thus making full use of the air pushing it out of the barrel.
With bullets on the firearms side, how efficient the bullet is when on its flight path is called Bullet Coefficient or BC’s.Im curious as too what the BC’s are on these pellets are.Could it be that the .25’s have a higher BC than the 30?Could be a possibility
Hello, it could be because the 250 fits better to the barrel and makes better use of the air, greetings.
@@Piupiu68az yes I thought about that, but they also go easier into the magazine. So I think there is something with the .249 slugs. Also looking at the colour difference...
@@AirgunNL And if they carry the cooler lubricant the 250 than the 249, hence the color difference?
@@Piupiu68az cooler lubricant?
The batch of 259 may be older than the 250, as they are lubricated, it may affect you.@@AirgunNL
What speed did it have at that final group. Also can you explain more about tuning with new new air valve adjuster. Explain how you are tuning in detail.
@@bkmahaffey Last groep was +/- 970 fps. What I do is, I tune the speed mostly with the regulator. Sometimes the hammer spring needs one or two turns in,after the regulator pressure has been increased.
I set the hammer spring so that it just opens the valve and then 2 turns extra in. This way the velocity is most consistent.
After that I use the valve dwell time adjustment to make small adjustments. When you set the valve dwell time too high, you can hear a difference in the shot (Don't know how to explain, but it sounds like too much air is coming out).
I didn't try to set the same speed yet with high reg and low dwell and vice versa. Maybe an interesting idea for a new video to check how much air is used in each shot with the different settings.
I didn't set the regulator above 150 bar yet I think. Between 80 and 135 bar you can shoot 28 to 38 grain from 800-1050 fps.