New S400 classic strange chrono results
Posted: Mon Feb 10, 2020 7:54 pm
The rifle is just a month old, I purchased it from my local RFD who chrono’d it while I was there and it averaged out at 11.2ftlb - happy days!
After a few days I did a full shot string from 190bar, 90 shots (jsb exact) before it started to fall, averaged out at 11.3 with a spread of only 18fps - even more happy days!
I then found that the barrel seemed to love QYS streamline 9.56 and I was getting amazing groups. I then chrono’d the gun using the QYS and I was just over 12. Thinking my chrono was broke I used someone else’s chrono with the same result.
Today I went back to my RFD and we did a 5 shot test on their Skan with the gun filled to 160bar, the results were:
AA 8.4
1. 11.20
2. 11.25
3. 11.25
4. 11.17
5. 11.25
QYS Streamline 9.56
1. 12.33
2. 12.19
3. 12.19
4. 12.33
5. 12.19
Obviously I am getting the RFD to lower the power slightly, but I would be really grateful if someone could explain why this is happening. We tried different guns in the shop and got the similar results, we also tried heavier pellets than the QYS and they were well within the legal limit.
Thanks in advance,
Barry
After a few days I did a full shot string from 190bar, 90 shots (jsb exact) before it started to fall, averaged out at 11.3 with a spread of only 18fps - even more happy days!
I then found that the barrel seemed to love QYS streamline 9.56 and I was getting amazing groups. I then chrono’d the gun using the QYS and I was just over 12. Thinking my chrono was broke I used someone else’s chrono with the same result.
Today I went back to my RFD and we did a 5 shot test on their Skan with the gun filled to 160bar, the results were:
AA 8.4
1. 11.20
2. 11.25
3. 11.25
4. 11.17
5. 11.25
QYS Streamline 9.56
1. 12.33
2. 12.19
3. 12.19
4. 12.33
5. 12.19
Obviously I am getting the RFD to lower the power slightly, but I would be really grateful if someone could explain why this is happening. We tried different guns in the shop and got the similar results, we also tried heavier pellets than the QYS and they were well within the legal limit.
Thanks in advance,
Barry