Shooting the breeze Valley Arms Sponsors of UKAHFT  
Go Back   Shooting the breeze > The Chat > Hunter / Field Target

Hunter / Field Target Anything metal target related...

Thread Tools Display Modes
Old 29th June 2015, 04:24 PM
mikeygasbag's Avatar
mikeygasbag mikeygasbag is offline
Join Date: Jul 2009
Member of: Fort Airgun Club
Location: Oswestry
Posts: 71
Default Some HFT 500 info.

Iím putting this post up as it may be of interest to Air Arms HFT 500 owners.

After experiencing a little frustration with not seeming to be able to get at least 40 consistent shots with my HFT 500, I decided it would be best to spend some time shooting a fill over the chrono. Since buying the rifle, I have been filling it to around 175 BAR for competitions.

Right, the sun was shining this afternoon, so what better time to get stuck in. First I adjusted and set the power to 765 fps, using prepared JSB Exact 4.52 pellets, whilst the on-board pressure gauge read 150 BAR. Then I topped the rifle back up to 180 BAR, read from the divers air cylinder gauge. At this point, the on-board pressure gauge was reading almost 200 BAR. So the first thing Iíve learned is that the on-board gauge is somewhat optimistic and reads around +20 BAR.

Then I proceeded with a string from 180 BAR down to where my Combro indicated a drop off of power output. I carried out the test by firing a pellet, taking the chrono reading and writing it down. I then dry fired four shots. Thus, the first shot was recorded, then shot 5, then shot 10, then 15 and then 20 and so on.

756, 759, 759, 760, 758, 763, 763, 768, 766, 763, 768, 769, 772, 769, 769, 771, 762, 765, 762, 763, 766, 761, 758, 752, 746.

Interesting to note that I also checked the on-board gauge around every 20 shots or so, and found that my gauge is a bit like a car petrol gauge, in as much as it doesnít seem to drop very quickly, then when it eventually reaches over halfway, drops down very quickly. So I wonít be using the on-board gauge to help me with topping up procedures. Just out of interest, the on-board gauge read 175 BAR after 25 shots, then 170 Bar after 40 shots, 150 BAR after 60 shots, 140 BAR after 80 shots, 130 BAR after 100 and 120 BAR after 120 shots. I guess that the pressure inside the air cylinder was more like 100 BAR as the shot to shot power started to drop quite rapidly. If my calculations are correct, I got 120 shots out of using 60 BAR of air. Can that be right? That seems very frugal to me.

Anyway, the whole purpose of this exercise was to get some idea of shot count and also discover where the sweet spot is on my HFT 500. Itís looking like I will be filling to 150 BAR only, which should give me around 50 decent shots to play with, before needing to top up again. Again, just out of interest, the power deviation over 50 shots within this sweet spot was 762 fps lowest and 772 fps highest. So, thatís 10 fps variation over 50 shots. If you take away the one highest and one lowest reading, which I believe is the correct way to calculate fps deviation, then it's only an 8 fps deviation over 48 shots! All this with an un-regulated rifle. Mind you, I have cleaned, smoothed and polished all the internal moving parts.

Founder member ~ Fort Airgun Club

Air Arms HFT500, Sightron SIII 10x42 MMD
Air Arms Ultimate Sporter, Sightron SIII 10x42 MMD
Reply With Quote
Connect With Facebook to "Like" This Thread

Old 15th July 2015, 08:37 AM
Akita Akita is offline
Senior Member
Join Date: Sep 2013
Member of: Greyhound & Purley Chase
Location: UK
Posts: 188

Ive been fine tuning my regulated HFT500 so far ive got some good results, i chronod the 1st shot then every tenth shot with unweighed 8.4 exacts

210bar fill
1st shot = 781
10th shot = 775
20th shot= 778
30th shot= 778
40th shot= 776
50th shot= 778
60th shot= 782
70th shot= 779
80th shot= 777
90th shot= 785
100th shot= 782
110th shot= 783
120th shot= 782
130th shot= 781
140th shot= 782
150th shot= 789
160th shot= 785

after the 160th shot it dropped of the 85bar reg big time.
Glad i picked it up second hand with a reg fitted as i feel the shot count is very poor standard giving the size of the air resivour.
Reply With Quote
Old 15th July 2015, 03:47 PM
DEAN C.'s Avatar
DEAN C. DEAN C. is offline
Steyr Convert
Join Date: Apr 2009
Member of: Emley Moor FTC
Location: Doncaster
Posts: 686

Interesting results which are also useful for MPR owners, even thought he number of shots will differ slightly.

BTW do you know who fitted the reg?
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Steyr reg info please.. cloverleaf Steyr 56 20th December 2015 08:33 AM
New EVO anyone any info phila78 General Airgun Chat 2 12th December 2012 04:12 PM
Info maddog General Airgun Chat 8 9th May 2012 06:28 AM

All times are GMT. The time now is 03:55 AM.

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd. Skin design and concept by Attitude