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Posted: 7/9/2008 7:30:24 AM EDT
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does anyone know the lenght of various bullets for .223 rem. i have the specific gravity of various .223 rem bullets but i would also like to know the lengths of the most popular bullets. i don't want to know the length of the bullet plus case or case; i just want to know the length of the bullets themselves. any help with greath. |
M855 is .904 IIRC |
Difficult to say, if not impossible. You might measure a sample and get an average, but I'm not real sure how that helps. Even the quality makers bullet length varies from base to tip, but when measured from the ogive to the base it varies little. Lesser quality makers vary more in both respects. That's the primary reason I use a Redding Competition seater die that seats from the ogive to give consistent seating depth, even though over all length may vary slightly. I may be confused about what you're asking for here. I'll go measure some and follow up. ETA: OK here toy go. --------------------------------------- Prvi 62 grain, SS109 SCFMJBT from Wideners OAL from 10 samples .919, .928, .925, .913, .923, .921, .912, .926, .923, .919 from ogive same 10 samples .501, .499, .495, .501, .503, .500, .499, .500, .492, .500 --------------------------------------- Prvi 75 grain match HPBT(hey, that's what they called them) OAL from 10 samples .968, .968, .968, .964, .968, .972, .972, .965, .967, .969 from ogive same 10 samples .580, .580, .579, .578, .580, .582, .579, .579, .579, .581 --------------------------------------- Nosler 77 grain custom competition HPBT OAL from 10 samples .973, .974, .977, .976, .975, .978, .979, .978, .979, .978 from ogive same 10 samples .606, .605, .605, .605, .605, .603, .605, .603, .605, .604 --------------------------------------- Now I ain't no statistics person, but it ain't just the high to low that matters. It's the consistency of the batch that does, and weight variance is omitted. Have fun with this if it helps. |
| good news! all the information that yall gave me concerning the dimenions of these bullets have been put to good use. I have a mini 14 with a twist of 10:1. that with a 5.56 mm 55 grain winchester (fake natos) was getting about on average 4 or 5 MOA. with the research in mind i got some .223 winchester 62 grain winchester because its specific gravity is 10.1 and a lenght of .814 in. the MOA is now exactly 1 MOA repetibly! nothing done to the rifle just some research in to bullets vs rifle twist and good information. thank all of you that helped! |
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I am glad that it worked out. I want to know, but I am afraid this concept is above me with lead Sg hovering near 11 and copper around 9 as compared to H2O then considering a 62 grain bullet to boot... wondering what I've been missing and... (tilt tilt tilt  )At the same time, I am fruminous beyond wiggles over the reference to bullet specific gravity, and my knickers are boggled in ruination at my dramatic failure of comprehension. |
What he said I think. 
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the concept is a very simple idea that relates the dimenions of any particular bullet to the rifling twist needed kind of like an X Y equation. the equation is this: ((180*calibur^2)/length)*(specific gravity/10.9)^.5 = Twist rate. the suprizing thing is that it work very well! here we do one for the bullets that i used ((180*.224^2)/.814)*(10.1/10.9) = 10.6 ... this was the closest match i could get to 10. i have the target that i was shooting. it has the holes from the M193, the M855, and the 62 gr winchester. considering that i am not a bench rest god, i produced very good group of three with the 62 gr winchester. the point is not that the winchester bullets are bad ass (relativily cheap bullets) or that my rifle is a target queen (its a run of the mill mini 14), the point is that matching the correct bullet to your particular rilfe is very very important. |
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