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Air Gun Home Forum Index » General Air Gun Questions and Topics » Best guns for super heavy .177 pellets    View previous topic :: View next topic  Best guns for super heavy .177 pellets   Posted: Fri Jan 01, 2010 2:28 pm Verado Member Joined: 26 Nov 2009 Posts: 70 Found these on pyramidair.com. I always hear people talking about using heavier pellets for longer ranges. Eun Jin .177 16.1G. My question is will these work in any gun, or are they to heavy for a Quest 1000 http://www.pyramydair.com/s/p/Eun_Jin_177_Cal_16_1_Grains_Round_Nose_220ct/284   Posted: Fri Jan 01, 2010 2:36 pm rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC Quote: are they to heavy for a Quest 1000 My guess is yes, they may even cause spring damage.... You would only get 500-550 fps with it.... Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count!   Posted: Fri Jan 01, 2010 4:39 pm Verado Member Joined: 26 Nov 2009 Posts: 70 I was wondering if these would be more suited to a PCP then a springer. Im going to stay around 7.5g-11.0g for my pellet choices.   Posted: Fri Jan 01, 2010 6:54 pm Juggernaut0504 Member Joined: 03 Dec 2009 Posts: 44 from what I know (which isn't really a lot ) heavier pellets are more well suited for PCP and CO2 AG's   Posted: Fri Jan 01, 2010 7:01 pm broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands Don't heavy pellets make for a better build up of pressure or something along that line? I was always told that I should shoot heavy pellets in my .177 magnum springers. _________________ BIG GAP   Posted: Fri Jan 01, 2010 7:32 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA Quote: My guess is yes, they may even cause spring damage Piston slam with light pellets is pretty intuitive; what would be the mechanism whereby an ultra heavy pellet would damage the spring? I have read that elsewhere, but I don't understand the physics involved. _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Fri Jan 01, 2010 7:50 pm rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC I have to admit, I just repeated what I had read, here.... You're right, I can think of no reason a heavy pellet could damage a spring.... on the other hand, I have first hand experience with light pellets ruining the firing cycle bigtime.... My Phantom/Quest really disliked anything under 13.5 grains.... Sorry for shooting from the lip, there.... don't know what I was thinking.... OK, I wasn't thinking.... Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count!   Posted: Fri Jan 01, 2010 7:52 pm rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC On the other hand, he was looking for pellets for "long range".... In a Quest where they might hit 550 fps at best.... they would have a real rainbow of a trajectory.... so not a good choice for "long range".... Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count!   Posted: Fri Jan 01, 2010 8:07 pm sniper Silver Status Member Joined: 28 Nov 2008 Posts: 3752 Location: Star, Idaho i sent my gamo 440 in for a respring back in the 90's under warranty and gamo told me heavy pellets can cause excessive spring wear... but who wants to believe gamo.... _________________ I believe in gun control, If there's a gun around I want to be controlling it.......   Posted: Fri Jan 01, 2010 10:38 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA Quote: Sorry for shooting from the lip, there.... don't know what I was thinking.... I wasn't questioning the validity of your argument, since I also had read it elsewhere. This is what I read (by Charliedatuna in the "do's and don'ts section of his site): "They can cause damage and spring fatigue beginning with just a few shots and when disassembled, the damage caused by heavy pellets and detonation is easily detected and identifiable." He doesn't supply any explanation, except for mentioning heavy pellets and detonation in the same sentence. On the other hand, you have Tom Gaylord, who says this: "Some people feel heavy pellets also damage mainsprings. I don't believe this myself, but as I said, there isn't much to go on." http://www.pyramydair.com/blog/2006/02/best-pellets-for-diana-rws-52-how-to.html and.. "Heavy pellets will not damage a mainspring, but I think very lightweight ones might." http://www.pyramydair.com/blog/2006/04/can-you-keep-clean-barrel-with-crosman.html Gaylord asserts that using heavy pellets will have consequences in accuracy and efficiency. Accuracy because a heavy pellet is longer, and therefore might not be matched to the twist rate of a barrel meant for shorter pellets. Efficiency because of "piston bounce." http://www.pyramydair.com/blog/2006/09/piston-bounce-when-is-pellet-just.html With a very light pellet, the pellet starts moving before the piston reaches the end of the cylinder, and less pressure is developed. With a very heavy pellet the piston bounces off a cushion of air before the pellet starts moving, so when the pellet moves it does so under less pressure. Somewhere in the middle is the ideal (most efficient) pellet that moves just as the piston reaches the end of its stroke. It seems to me that with either the ideal or the heavy pellet, the maximum pressure (and therefore temperature) would be the same, so the risk of dieseling ("detonation") would be the same. Bob, I agree completely about the "rainbow" trajectory of a very heavy pellet. So if you made it this far, what's my point? Like always, you try different pellets until you find one with the accuracy/efficiency to do the job intended. _________________ ¡Listo! ¡Apunte! ¡Fuego! from a old post I have   Posted: Sat Jan 02, 2010 9:08 pm T191032 Veteran Member Joined: 30 Dec 2009 Posts: 100 Location: VA Eu Jins, best suited for the PCP airguns, from my understanding. I've got a post from Russ Best, dated back in 2002, which stated : "In .177 stay between 7.3 and 9 grains In .22, stay between 11 and 15.5 grains" as mentioned, piston slam, toasting seals, etc. is mentioned. He works on 'em, I don't. 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