airarms Posted April 19, 2010 Report Share Posted April 19, 2010 help ... my hw 80 is inconsistent.shooting .22 accupels.when zeroing it i get a good grouping for about 3or4 shots then the nx shot is couple inches out,this happens often and cant be the odd flyer,i have rcently taken a few coils off the spring cos it was overpowered,could this be why and if so would a new spring fix the problem cos think the spring been in it for a while . any help would be appreciated .. thanks Quote Link to comment Share on other sites More sharing options...
tweedledee Posted April 19, 2010 Report Share Posted April 19, 2010 best to chrono it and check for shot to shot consistency. Quote Link to comment Share on other sites More sharing options...
lineshooter Posted April 19, 2010 Report Share Posted April 19, 2010 (edited) Have you measured the power of a string of say ten shots over a cronogaph, it could be what you have done to the spring or it could be it just does`nt like the pellets. What was the power before you altered the spring. Edited April 19, 2010 by lineshooter Quote Link to comment Share on other sites More sharing options...
airarms Posted April 19, 2010 Author Report Share Posted April 19, 2010 Have you measured the power of a string of say ten shots over a cronogaph, it could be what you have done to the spring or it could be it just does`nt like the pellets.What was the power before you altered the sping. it was shooting 22ft<lbs.now shooting 9ft lbs,pretty consistent.ive tried h+n ftt ,which was what was recommended,but same story Quote Link to comment Share on other sites More sharing options...
lineshooter Posted April 19, 2010 Report Share Posted April 19, 2010 Is it/was it FAC then? Quote Link to comment Share on other sites More sharing options...
airarms Posted April 19, 2010 Author Report Share Posted April 19, 2010 yes it was ,but wanted it 12 ft lbs .any suggestions .thanks guys Quote Link to comment Share on other sites More sharing options...
lineshooter Posted April 19, 2010 Report Share Posted April 19, 2010 I did read some where that some Fac guns suffer accuracy problems when de-tuned just by cutting the spring, you may not want to spend any money but it may be worth trying a V-mach spring or the like for a 12 ft/lb rifle, the power may be too low it might want to run around 11.5ft/lb, I had a Venom Hw 80 years back , a heavy gun to lugg around a shoot, but nice and smooth to cock and very accurate. Quote Link to comment Share on other sites More sharing options...
deputy dog Posted April 19, 2010 Report Share Posted April 19, 2010 Dont bother with the spring. Get rid of it and put a gas ram in it. That way you will have a great gun with a smooth power system which will last years and certainly longer then an spring. I owned a Hw80 with a gas ram and i often wondered why they brought out the hw90 when you could convert your hw80 into virtually the same gun. I think gas rams sell for about £50 mark. And thats got to be cheaper then having it tuned up with another springer. Quote Link to comment Share on other sites More sharing options...
airarms Posted April 20, 2010 Author Report Share Posted April 20, 2010 I did read some where that some Fac guns suffer accuracy problems when de-tuned just by cutting the spring, you may not want to spend any money but it may be worth trying a V-mach spring or the like for a 12 ft/lb rifle, the power may be too low it might want to run around 11.5ft/lb, I had a Venom Hw 80 years back , a heavy gun to lugg around a shoot, but nice and smooth to cock and very accurate. thank you for your input mate Quote Link to comment Share on other sites More sharing options...
airarms Posted April 20, 2010 Author Report Share Posted April 20, 2010 Dont bother with the spring. Get rid of it and put a gas ram in it. That way you will have a great gun with a smooth power system which will last years and certainly longer then an spring. I owned a Hw80 with a gas ram and i often wondered why they brought out the hw90 when you could convert your hw80 into virtually the same gun. I think gas rams sell for about £50 mark. And thats got to be cheaper then having it tuned up with another springer. i have a hw 90,which is past its best but the ram etc is good how easy is it to put gas ram into my hw 80.any sites ,videos i can use..thanks mate Quote Link to comment Share on other sites More sharing options...
Dougy Posted April 20, 2010 Report Share Posted April 20, 2010 I was under the impression that once an an air rifle was regestered FAC then that was it. maybe wrong here but i dont think so. Thats if the air rifle WAS actually on ticket in the first place. Quote Link to comment Share on other sites More sharing options...
lineshooter Posted April 20, 2010 Report Share Posted April 20, 2010 I thought you could lower the power on an Fac air rifle although it still remains Fac, but you cannot increase the power of a 12ft/lb air rifle. I`m sure some knowledgable person will be along to soon to put us right. Quote Link to comment Share on other sites More sharing options...
codling99 Posted April 20, 2010 Report Share Posted April 20, 2010 (edited) once a air rifle is registered as a fac it stays a fac,but power is irrelavant,you can set it as low or high as you like. gas rams are fitted like a spring,easy on hw 80s 1. Ensure that the rifle is not cocked. 2. Remove fore-end stock screws and both trigger guard screws. Remove action from stock. 3. Unscrew complete rear trigger block from rear of receiver. CAUTION: This block is under main spring tension and can be dangerous, take care. 4. Remove main spring and guide. 5. With a suitable pin punch drive front cocking lever pin out of the breech block. Lift out lever from breech block and unhook from piston shoe. Lift shoe out of keyhole in forward end of cocking slot. 6. Push piston out of receiver tube (all parts removed from inside receiver are now redundant). 7. Clean out receiver tube of oil and grease residue ready for reassembly. 8. Lightly grease around (not in front of) piston crown (12ft/lbs conversion remove HW80 crown and fit to conversion), cocking shoe slot and rear raised piston diameter. Slide back into receiver tube aligning cocking slot in piston with slot in receiver. Fit replacement shoe provided. Screw trigger block in tightly. 9. Reverse strip down procedure, use Loctite 221 on all stock screws and conversion is finished. http://www.theoben.co.uk/files/strt_hw80.pdf Edited April 20, 2010 by codling99 Quote Link to comment Share on other sites More sharing options...
airarms Posted April 20, 2010 Author Report Share Posted April 20, 2010 once a air rifle is registered as a fac it stays a fac,but power is irrelavant,you can set it as low or high as you like. gas rams are fitted like a spring,easy on hw 80s 1. Ensure that the rifle is not cocked. 2. Remove fore-end stock screws and both trigger guard screws. Remove action from stock. 3. Unscrew complete rear trigger block from rear of receiver. CAUTION: This block is under main spring tension and can be dangerous, take care. 4. Remove main spring and guide. 5. With a suitable pin punch drive front cocking lever pin out of the breech block. Lift out lever from breech block and unhook from piston shoe. Lift shoe out of keyhole in forward end of cocking slot. 6. Push piston out of receiver tube (all parts removed from inside receiver are now redundant). 7. Clean out receiver tube of oil and grease residue ready for reassembly. 8. Lightly grease around (not in front of) piston crown (12ft/lbs conversion remove HW80 crown and fit to conversion), cocking shoe slot and rear raised piston diameter. Slide back into receiver tube aligning cocking slot in piston with slot in receiver. Fit replacement shoe provided. Screw trigger block in tightly. 9. Reverse strip down procedure, use Loctite 221 on all stock screws and conversion is finished. http://www.theoben.co.uk/files/strt_hw80.pdf can i use the ram from my old hw 90 or are they different to the ones used for conversions Quote Link to comment Share on other sites More sharing options...
codling99 Posted April 20, 2010 Report Share Posted April 20, 2010 not 100% sure sorry mate. :( Quote Link to comment Share on other sites More sharing options...
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