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Air Gun Home Forum Index » General Air Gun Questions and Topics » Now if one was to....    View previous topic :: View next topic  Now if one was to....   Posted: Thu Jan 28, 2010 6:59 pm kanyon Silver Status Member Joined: 09 Aug 2008 Posts: 1582 Location: New Zealand build a PCP/HPA air gun in .177 cal with a 18" barrel & boss valve shooting 10grain pellets...... HOW much pressure would be required to push the pellet at around 1000fps.. Pete   Posted: Thu Jan 28, 2010 7:54 pm rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC My .177 PCP HFT maxes out at 970 fps using 10 grain pellets and a 24" barrel at 1500 psi.... It uses a Disco valve.... I don't know if a Boss Valve would make up for the 6" shorter barrel or not.... but I'm guessing you will need at least 1600 psi.... If that is on a 22XX tube, you are pushing the limits of safety to go higher.... Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count!   Posted: Thu Jan 28, 2010 8:15 pm kanyon Silver Status Member Joined: 09 Aug 2008 Posts: 1582 Location: New Zealand rsterne wrote: My .177 PCP HFT maxes out at 970 fps using 10 grain pellets and a 24" barrel at 1500 psi.... It uses a Disco valve.... I don't know if a Boss Valve would make up for the 6" shorter barrel or not.... but I'm guessing you will need at least 1600 psi.... If that is on a 22XX tube, you are pushing the limits of safety to go higher.... Bob kool... was thinking around 1400/1500 psi.... I'm not going to base it on the 22xx guns.. The design of the 22xx applys to meany constraints....I want a bullpup style so it will need the hammer at the front /muzzle end so there is no linkage to the trigger.... I want to build from scratch...Other than the barrel/valve/tank & pressure regulater.. Thanks Pete Now if one was to....     Air Gun Home Forum Index » General Air Gun Questions and Topics You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum All times are GMT - 5 Hours   Page 1 of 1   All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First  Select a forum Main Forums----------------AirGunHome Q&AGeneral Air Gun Questions and TopicsPicture GalleryTarget Shooting: Casual, Fun and CompetitionHunting, Pest Control, Varminting People/Events/Airgun Issue Discussion----------------Introduce YourselfThe BS TopicClubs/Events/Regional/Political Airgun Issues Maintenance, Modification and Reviews----------------RiflesPistolsAntique, Collector and Novelty AirgunsBB GunsPellets/AmmoOpticsAccessoriesAirgun Smithing Buy, Sell or Trade Forums----------------For SaleWant to Buy   Note: If you are seeing "Please enter your username and password to log in." Your browser cookies have been reset or you need to register to access the topic in question. Use the 'Register' button near the top left of this page. Click Here for AirGunHome.com Main Page Powered by phpBB © 2001-2004 phpBB Group Partial Styling Supplied by Vjacheslav Trushkin Themes Database.