The Nightshift
Active member
So I dipped my toe in the impact waters in January and got an M4 .22 sniper.
I use it mainly for rat control up to three nights a week firing off 200/200 a night using usb's 18.13gr. I dropped the velocity by guesswork, my chronograph was still on order, with reg on 90, micro on 2, Macro on 8, valve still on line 4. Was getting excellent groups, and over 200 shots per fill.
What I did notice that I was missing some targets, and then follow up shots were good, mainly after a small break in shooting while moving to new areas.
Finally I had my chronograph, an Lmbr, so I thought it would be good to do a couple of tune settings. My present tune after a few shots settled at 780fps, so I thought to put a higher setting into my scope at around 880 fps, so I used the micro until at 2.6, Macro 14, I was getting 880/890. So time to test for grouping. I fired 5 shots at a target 30 metres away, went to check them and was pretty tight. Returned to the file to fire another batch and noticed the first shot was only 849 and it took 5 shots to get it back up to above 880. This happened every time I stopped, even if only for a couple of minutes. Groups were still pretty good, but did get the odd flier(possibly a damaged pellet). So am wondering if the regulator is faulty.
Now to compound things I was so intent on what was happening with the speeds, I had forgotten that I had upped the power and of course the extra air drain and let the reg 1 pressure dip below that of reg 2
I did refill, and try again. No noticeable difference, still getting low speed on the first few shots and good groups. So what could be the issue, or is there not one, and secondly what damage could I have done by letting the pressure drop.
any advice most welcome
I use it mainly for rat control up to three nights a week firing off 200/200 a night using usb's 18.13gr. I dropped the velocity by guesswork, my chronograph was still on order, with reg on 90, micro on 2, Macro on 8, valve still on line 4. Was getting excellent groups, and over 200 shots per fill.
What I did notice that I was missing some targets, and then follow up shots were good, mainly after a small break in shooting while moving to new areas.
Finally I had my chronograph, an Lmbr, so I thought it would be good to do a couple of tune settings. My present tune after a few shots settled at 780fps, so I thought to put a higher setting into my scope at around 880 fps, so I used the micro until at 2.6, Macro 14, I was getting 880/890. So time to test for grouping. I fired 5 shots at a target 30 metres away, went to check them and was pretty tight. Returned to the file to fire another batch and noticed the first shot was only 849 and it took 5 shots to get it back up to above 880. This happened every time I stopped, even if only for a couple of minutes. Groups were still pretty good, but did get the odd flier(possibly a damaged pellet). So am wondering if the regulator is faulty.
Now to compound things I was so intent on what was happening with the speeds, I had forgotten that I had upped the power and of course the extra air drain and let the reg 1 pressure dip below that of reg 2
I did refill, and try again. No noticeable difference, still getting low speed on the first few shots and good groups. So what could be the issue, or is there not one, and secondly what damage could I have done by letting the pressure drop.
any advice most welcome
