Phill-W68 547 Posted June 3, 2018 Report Share Posted June 3, 2018 Bit of advise if you can, I decided to chrono my hw100 in .177 using jsb heavies in the garden, put a target out at 19yds to aim at and had the f1 chrony at the muzzle, I filled the hw to 200bar, now my first shot read 637.6 on the chrony and after 5 full mags (70) shots the highest reading I got was 736.6 and I was down to 105bar, now out of all 5 mags I never got a consistency most shots seem to go up in fps by a little bit, even tho the target at 19yds was just a large one hole group until I got 3/4 through the 4th mag then the pellet started to hit high, do you guys think it needs a service with the fps being at it is?. Thankyou in advance.. Quote Link to post
Jonjon79 13,340 Posted June 3, 2018 Report Share Posted June 3, 2018 That could be anything Phil - testing over the chrono outside, the first culprit I'd look at would be the nice weather - sun shine on the sensors can throw up odd readings. If the rifle was warning up in the heat, the grease in the trigger mechanism could have been causing some inconsistencies as it was loosening up. I'd try to find somewhere that I could have the target further away, then test again - the groupings will then help to give you a better indication of what's going on. 2 Quote Link to post
villaman 9,979 Posted June 3, 2018 Report Share Posted June 3, 2018 736 is over 12ft/lbs , best to clean the barrel first and try again . Is your chrono working ok ? Might be oil on the hammer system or you reg bevels might need cleaning 2 Quote Link to post
Phill-W68 547 Posted June 3, 2018 Author Report Share Posted June 3, 2018 The test was done in the evening with no sun in the garden... As for oil on the hammer or reg bevels???need cleaning, not sure it's something I would like to do as Im not sure of internal gun workings... Quote Link to post
steg 609 Posted June 3, 2018 Report Share Posted June 3, 2018 What's the fps variation like with another pellet? I've got a tin of heavies here all over the place on the chrono but then get a nice 5 fps spread again when I switch back to the guns favourite AA express 1 Quote Link to post
villaman 9,979 Posted June 3, 2018 Report Share Posted June 3, 2018 1 hour ago, Phill-W68 said: The test was done in the evening with no sun in the garden... As for oil on the hammer or reg bevels???need cleaning, not sure it's something I would like to do as Im not sure of internal gun workings... Have you cleaned the barrel with a pull through ? 1 Quote Link to post
bigmac 97kt 13,730 Posted June 3, 2018 Report Share Posted June 3, 2018 As mitch says clean the barrel out with a pull through plus give the mags a light spray with 3in1 oil and give them a clean as well I went from this Quote Link to post
bigmac 97kt 13,730 Posted June 3, 2018 Report Share Posted June 3, 2018 Just now, bigmac 97kt said: As mitch says clean the barrel out with a pull through plus give the mags a light spray with 3in1 oil and give them a clean as well I went from this to this just by cleaning the mags and cocking arm 1 Quote Link to post
Phill-W68 547 Posted June 3, 2018 Author Report Share Posted June 3, 2018 4 hours ago, villaman said: Have you cleaned the barrel with a pull through ? The barrel was cleaned a few weeks ago and it's only shot maybe 150pellets since then all jsb heavies, Iast time I was down the range I was getting good groups at 42yds, but it had a slow leak a few weeks back, so I changed the o-ring where the bottle screws on and that sorted the leak but since then the fps has gone funny.... Quote Link to post
Phill-W68 547 Posted June 3, 2018 Author Report Share Posted June 3, 2018 5 hours ago, steg said: What's the fps variation like with another pellet? I've got a tin of heavies here all over the place on the chrono but then get a nice 5 fps spread again when I switch back to the guns favourite AA express Always had good consistency with heavies and good groups out to 40/50odd yds, at around 675 fps, not got any other pellets to try Quote Link to post
villaman 9,979 Posted June 3, 2018 Report Share Posted June 3, 2018 Like i said give the barrel a clean , some barrels need cleaning more than others 675fps is only 10.4 ft/lbs that is about 1.4 ft/lbs under powered with those pellets IMO . How old is this HW100 , if its under 1 year old i would send it back or do it your self https://www.youtube.com/watch?v=_B3DzcmEFQk Quote Link to post
Phill-W68 547 Posted June 3, 2018 Author Report Share Posted June 3, 2018 1 hour ago, villaman said: Like i said give the barrel a clean , some barrels need cleaning more than others 675fps is only 10.4 ft/lbs that is about 1.4 ft/lbs under powered with those pellets IMO . How old is this HW100 , if its under 1 year old i would send it back or do it your self https://www.youtube.com/watch?v=_B3DzcmEFQk It's 3yr old, I got it 2nd hand.. Thx for the video, I,ll give it a watch Quote Link to post
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.