12borejimbo Posted October 4, 2010 Report Share Posted October 4, 2010 Is there any such thing? You can get it for a .22 and even up to a .308, but I didnt know if there was any for the .17 or if any reason there cant be? Quote Link to comment Share on other sites More sharing options...
Frenchieboy Posted October 4, 2010 Report Share Posted October 4, 2010 That's a bloody good question! If there was subsonic ammunition available for the 17HMR just think about how much better the rifle would be with a sound mod fitted when you could get rid of the sonic crack! Then you could have the ideal bunny bashing rifle! Quote Link to comment Share on other sites More sharing options...
kyska Posted October 4, 2010 Report Share Posted October 4, 2010 (edited) Its interesting, you'd only get mid 40 ft/lb muzzle energy, don't know how much use it'd be, I'm going to have a look at the trajectory on chairgun. I think I'd use my fac rapid... Edited October 4, 2010 by kyska Quote Link to comment Share on other sites More sharing options...
kyska Posted October 4, 2010 Report Share Posted October 4, 2010 OK quick look, obviously not using any decent measurements its has pretty much a trajectory of my 32ft/lb rapid in .22. Energy retention is better though. This is calculated with a 17g bullet at 1100, which is near as dammit (25fps not taking environmental changes into account) the speed of sound. Quote Link to comment Share on other sites More sharing options...
Beardo Posted October 4, 2010 Report Share Posted October 4, 2010 would it still fragment properly at that speed? Quote Link to comment Share on other sites More sharing options...
Billy. Posted October 4, 2010 Report Share Posted October 4, 2010 What would be the point in a subsonic HMR round? You'd need a hollowpoint to get it to fragment and the copper jacket would probably stay intact anyway... If you want a subsonic .17HMR, get an LR. The bullet will just fly on the same trajectory as a 22lr, as the speed will be the same. Quote Link to comment Share on other sites More sharing options...
al4x Posted October 4, 2010 Report Share Posted October 4, 2010 is the HM2 subsonic? personally the whole point of the round is that its going fast to make the ballistic tip do its stuff! Quote Link to comment Share on other sites More sharing options...
Billy. Posted October 4, 2010 Report Share Posted October 4, 2010 is the HM2 subsonic? personally the whole point of the round is that its going fast to make the ballistic tip do its stuff! No, it's not. Just carries less FT/lb. Exactly. Quote Link to comment Share on other sites More sharing options...
12borejimbo Posted October 4, 2010 Author Report Share Posted October 4, 2010 So what is subsonic then? Quote Link to comment Share on other sites More sharing options...
Billy. Posted October 4, 2010 Report Share Posted October 4, 2010 (edited) So what is subsonic then? Some .22LR Air gun Select shotgun cartridges Edited October 4, 2010 by Billy. Quote Link to comment Share on other sites More sharing options...
Oxon88 Posted October 4, 2010 Report Share Posted October 4, 2010 i've never seen any sub .17hmr Quote Link to comment Share on other sites More sharing options...
12borejimbo Posted October 4, 2010 Author Report Share Posted October 4, 2010 Some .22LRAir gun Select shotgun cartridges Sorry that sounded a bit confusing billy, I mean what is the definition to subsonic, has it only got a certain power so that is does not make a supersonic crack? Quote Link to comment Share on other sites More sharing options...
Blunderbuss Posted October 4, 2010 Report Share Posted October 4, 2010 (edited) The definition of sub sonic is something travelling below the speed of sound! Super sonic is faster than the speed of sound. The speed of sound in air at sea level is 343 m/s or 1126.547 ft/s (768.095 mph) at a temperature of 20°C or 68°F Edited October 4, 2010 by Blunderbuss Quote Link to comment Share on other sites More sharing options...
kent Posted October 4, 2010 Report Share Posted October 4, 2010 What a waste of time that would be at only a couple of hundred feet per second faster than a .177 air rifle, bullet wouldn't expand / fragment. The whole point of the HMR is the flatter trajectory slowing it down and creating a gun inferiour in every respect to the .22 is just plain crazy. If you want something quieter use the .22 sub something quieter and safer FAC air. .308 win subsonics are a specialist sniper round for military use and have no relivence to the civilian market (they are also very difficult to come to terms with in use) Quote Link to comment Share on other sites More sharing options...
the running man Posted October 4, 2010 Report Share Posted October 4, 2010 What a waste of time that would be at only a couple of hundred feet per second faster than a .177 air rifle, bullet wouldn't expand / fragment. The whole point of the HMR is the flatter trajectory slowing it down and creating a gun inferiour in every respect to the .22 is just plain crazy. If you want something quieter use the .22 sub something quieter and safer FAC air. .308 win subsonics are a specialist sniper round for military use and have no relivence to the civilian market (they are also very difficult to come to terms with in use) not to mention,if u download a 308 that low you risk it detonating not burning. sub sonic .17 hmr,do me a favour. wat next light load for solid slug? or maybe a parachute? Quote Link to comment Share on other sites More sharing options...
kent Posted October 5, 2010 Report Share Posted October 5, 2010 not to mention,if u download a 308 that low you risk it detonating not burning. sub sonic .17 hmr,do me a favour. wat next light load for solid slug? or maybe a parachute? 308 subsonic loads are common use for the military and Lapua actually make a factory subsonic round but its not of any real use to civilians Quote Link to comment Share on other sites More sharing options...
Dekers Posted October 5, 2010 Report Share Posted October 5, 2010 What would be the point in a subsonic HMR round? You'd need a hollowpoint to get it to fragment and the copper jacket would probably stay intact anyway... If you want a subsonic .17HMR, get an LR. The bullet will just fly on the same trajectory as a 22lr, as the speed will be the same. Not unless they are the same weight and have the same BC, similar up to a point, but a 40g Sub Sonic LR will carry its energy far better than a 17g HMR, and also carry it further! ATB!! Quote Link to comment Share on other sites More sharing options...
gsm1968 Posted October 5, 2010 Report Share Posted October 5, 2010 308 subsonic loads are common use for the military and Lapua actually make a factory subsonic round but its not of any real use to civilians A lot of IMSSU shooters used subsonic loads for comfort and longer life of the weapon. Mostly home loads, as a lot of the weapons are wildcat carts. The detonation issue was overcome by filling the top of the case with a synthetic fibre before seating the bullet. This kept the powder against the primer, and it as good as burned to nothing when fired. I can never remember the name of the wool like fibre, but often have thought of loading large cal. subs. A 177hmr in subsonic? A catapult would outperform it!! Quote Link to comment Share on other sites More sharing options...
Dekers Posted October 5, 2010 Report Share Posted October 5, 2010 Frankly I see a sub sonic HMR about as useful as a chocolate fireguard! ATB!! Quote Link to comment Share on other sites More sharing options...
kyska Posted October 5, 2010 Report Share Posted October 5, 2010 Frankly I see a sub sonic HMR about as useful as a chocolate fireguard! ATB!! I agree, although I know little about BC's etc. I am a scientist of sort, and looking at the details, a .22 fac air will do the same near abouts. Interesting topic though. as others have said, the hmr is made for purpose. Quote Link to comment Share on other sites More sharing options...
Billy. Posted October 5, 2010 Report Share Posted October 5, 2010 (edited) Not unless they are the same weight and have the same BC, similar up to a point, but a 40g Sub Sonic LR will carry its energy far better than a 17g HMR, and also carry it further! ATB!! The bullets should touch the ground at the same time, but be a small distance apart, but not too far off Edited October 5, 2010 by Billy. Quote Link to comment Share on other sites More sharing options...
DaveK Posted October 6, 2010 Report Share Posted October 6, 2010 If someone came up with a subsonic round, then they wouldn't be MAGNUM would they. That's the whole point of HMR. It's a magnum round. Quote Link to comment Share on other sites More sharing options...
kent Posted October 6, 2010 Report Share Posted October 6, 2010 A lot of IMSSU shooters used subsonic loads for comfort and longer life of the weapon. Mostly home loads, as a lot of the weapons are wildcat carts. The detonation issue was overcome by filling the top of the case with a synthetic fibre before seating the bullet. This kept the powder against the primer, and it as good as burned to nothing when fired. I can never remember the name of the wool like fibre, but often have thought of loading large cal. subs. A 177hmr in subsonic? A catapult would outperform it!! IMSSU ? indulge me, is this some form of nancy boy indoor shooting or something? Quote Link to comment Share on other sites More sharing options...
the running man Posted October 6, 2010 Report Share Posted October 6, 2010 I think we can all agree we've exhausted this subject as its pointless.17hmr subs? Come off it. Quote Link to comment Share on other sites More sharing options...
njc110381 Posted October 6, 2010 Report Share Posted October 6, 2010 Maybe not pointless for someone who doesn't have FAC air? I find CB Longs very useful in my .22lr and they're the same. It would be good for HMR owners to be able to load a subby for close shots now and again, perhaps if a Pigeon landed in the tree above where they were shooting bunnies? If they made them I'm sure some people would buy them, just not enough to justify the production run. Quote Link to comment Share on other sites More sharing options...
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