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| qb78 mod test results https://www.airgunforum.ca/forums/topic57214.html |
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| Author: | bigborebrit [ Sun Sep 01, 2013 1:39 pm ] |
| Post subject: | qb78 mod test results |
Hi all thought I would share my test with you.Some info first the gun is the basic qb78 in .22 this has had all the ports opened up as far as possible also the valve has been modified the front cut away as much as possible also filter screen removed and valve head gas flowed ,the gun was run on just one co2 bulb at 72f the results 721.5 fps 718 713 705 700.5 698.4 695.3 685.6 673.6 663.3 655.2 639 631.3 a shot variation of just 7.4fps what do you think |
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| Author: | bigborebrit [ Sun Sep 01, 2013 2:54 pm ] |
| Post subject: | Re: qb78 mod test results |
sorry used 14.3 superpoints for test |
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| Author: | jezX [ Sun Sep 01, 2013 3:48 pm ] |
| Post subject: | Re: qb78 mod test results |
looks like you could drop your spring back alot and get a lil more even spread . maybe top end at 670f/s . you'd pick up a bunch of shots |
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| Author: | rsterne [ Sun Sep 01, 2013 3:50 pm ] |
| Post subject: | Re: qb78 mod test results |
It only took 11 shots before you were down 10% from the initial velocity, which seems pretty thirsty on CO2.... but that's what you get when you try for power.... Nearly 17 FPE on CO2 is pretty decent.... Bob |
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| Author: | bigborebrit [ Tue Sep 03, 2013 3:16 pm ] |
| Post subject: | Re: qb78 mod test results |
Thanks guys will try some more mods and post the results soon, some big bore stuff as well. |
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