Billy. Posted March 2, 2009 Report Share Posted March 2, 2009 I'm after a reputable source to give me the maximum velocities and ballistic coefficients of the top brand rimfire ammo for the .22lr and .17HMR. Basically if you've got an iPhone, there's an application called 'Ballistic' and it does what all the web based programs do, but on your phone...! Anyway, the application is great for centre fire ammo, but it's got no rimmy ammo... So I emailed the guy and asked if he could update it with some rimmys and he said he needs some manufacturers MV and BC. So if anyone can list them, that'd be great Quote Link to comment Share on other sites More sharing options...
garyb Posted March 2, 2009 Report Share Posted March 2, 2009 Why....? you'll still miss Quote Link to comment Share on other sites More sharing options...
wy111 Posted March 2, 2009 Report Share Posted March 2, 2009 Ok...You asked for it. The BC can be worked out from the mv and 100yds velocity. Give you summat to do. http://www.chuckhawks.com/rimfire_ballistics_table.htm Quote Link to comment Share on other sites More sharing options...
Jim682e Posted March 2, 2009 Report Share Posted March 2, 2009 If you know someone with a chronograph you could get the MV from that and you could also ask the technical department of your chosen ammo manufacturer and ask them for the BC of the bullets they use if they'd let you have that info Quote Link to comment Share on other sites More sharing options...
casts_by_fly Posted March 2, 2009 Report Share Posted March 2, 2009 you'll want to get your own chronograph info at the least for muzzle velocities. I shoot remmy subs and they are coming out around 1020-1040 fps in a 18" barrel. When I've done calculations based on 1040 and BC of 0.100 the drops have worked out pretty close at distance. Thanks, Rick Quote Link to comment Share on other sites More sharing options...
Billy. Posted March 2, 2009 Author Report Share Posted March 2, 2009 People are so happy to quote from googled sources yet they dont trust its knowledge when they need some themselves? I'm taking that as a little jab at my previous quotes that I have given from Google to other members... (Please tell me if I am wrong) My quotes that I have given to other people on the forum have been from the firearms law book, which is written in stone, therefore it can be quoted. As rimmy ammo can't be homeloaded, there is very very little technical data of the ammunition and what is written often contradicts other peoples' findings. I wanted some proper evidence ie Winchester's own findings and documentation or a member's thorough findings. Quote Link to comment Share on other sites More sharing options...
Beardo Posted March 2, 2009 Report Share Posted March 2, 2009 you can borrow my chrombo if you want (though you can only measure muzzle velocity with it, not a distance), if that's any help? Quote Link to comment Share on other sites More sharing options...
Billy. Posted March 3, 2009 Author Report Share Posted March 3, 2009 you can borrow my chrombo if you want (though you can only measure muzzle velocity with it, not a distance), if that's any help? Cheers Nick, but I'll have to turn it down. I was really only after information if anyone had it. I really can't be bothered to/afford to buy every type of rimfire 22lr and 17hmr round to test...! Thanks guys for the answers and links, I will try to pull something together out of the iffy data I can find knocking about on the net then. Quote Link to comment Share on other sites More sharing options...
casts_by_fly Posted March 3, 2009 Report Share Posted March 3, 2009 with some trial and error you can probably get close. If you're shooting subs, you know the velocity should be right around 1020-1040 since the speed of sound isn't much more than that. Use a BC of 0.100 and make a chart based on your gun. Then go out and shoot it at 50, 60, 70, etc and all of the distances you are concerned about. Now compare to the chart you generated and then throw it away. Now you have the actual drops and don't need a chart. The HMR is a lot better known than 22LR for BC because the bullets are a lot closer to centerfire bullets and are in the velocity range that centerfire bullets are interested in. Part of the problem with 22LR rimfire bullets is the turbulent zone going from super- to sub- sonic and then the BC at low muzzle velocities. I think the HMR BC is around 0.150, but check varmint al's website. Thanks, Rick Quote Link to comment Share on other sites More sharing options...
Tiff-TRG Posted March 3, 2009 Report Share Posted March 3, 2009 (edited) 0.125 (+/- 0.002) for the 17grain V-MAX at HMR velocities. Edited March 3, 2009 by Tiff-TRG Quote Link to comment Share on other sites More sharing options...
Paul223 Posted March 4, 2009 Report Share Posted March 4, 2009 I have ammo and ballistic's II, it has bc and mv for most rounds but only one .17hmr, what makes were you thinking of for .22lr Quote Link to comment Share on other sites More sharing options...
Billy. Posted March 4, 2009 Author Report Share Posted March 4, 2009 I have ammo and ballistic's II, it has bc and mv for most rounds but only one .17hmr, what makes were you thinking of for .22lr Just the main hunting stuff. CCI, Winchester etc etc. The guy who makes the program is actually really nice. However he says you just can't get much info for 22LR or 17... Quote Link to comment Share on other sites More sharing options...
Paul223 Posted March 5, 2009 Report Share Posted March 5, 2009 here are a few examples, way to many to list them all eley 40 grain sub xtra plus mv1065 bc0.115 rws 40grain lr sub hp mv1000 bc0.092 winchester 40grain lr hp ( w22lrb) mv1150 bc0.150 lapua 36grain lr sub hp mv1033 bc0.240 remington 38grain lr sub hp mv1050 bc0.125 aguila 38grain lr sub hp mv1025 bc0.111 aguila 30grain super max hp mv1750 bc0.102 cci 32grain lr stinger hp mv1640 bc0.103 remington 33grain lr yellow jacket hp mv1500 bc0.107 cci 36grain minimag hp mv1280 bc0.126 cci 40grain velocitor hp mv1435 bc0.132 hth Quote Link to comment Share on other sites More sharing options...
Billy. Posted March 6, 2009 Author Report Share Posted March 6, 2009 hth You are a star. Thank you. Do you have a link to your findings, or is it from your own calculations? Quote Link to comment Share on other sites More sharing options...
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