bgavin Posted August 22, 2020 Share Posted August 22, 2020 Can anybody post the bullet OAL and nose-to-crimp measurements? I shoot Ringer's bullets and Missouri, both in Hi-Tek. I'm interested in LRNFP type in 158 grains. Link to comment Share on other sites More sharing options...
Sedalia Dave Posted August 22, 2020 Share Posted August 22, 2020 1.590 OAL. Nose to crimp 0.310 Plus or minus 0.005 Link to comment Share on other sites More sharing options...
bgavin Posted August 23, 2020 Author Share Posted August 23, 2020 Thanks for the crimp. I need the OAL of the bullet itself, not the COAL Link to comment Share on other sites More sharing options...
John Boy Posted August 23, 2020 Share Posted August 23, 2020 Why do you need the bullet length? call the vendor you bought them from or if you cast, measure it Link to comment Share on other sites More sharing options...
bgavin Posted August 23, 2020 Author Share Posted August 23, 2020 Why? Because I asked a question, after not getting what I want elsewhere. If I cast it myself, I would measure it. Thanks for the help. Link to comment Share on other sites More sharing options...
Springfield Slim SASS #24733 Posted August 23, 2020 Share Posted August 23, 2020 I think what John Boy meant was, all 158 grain LRNFP bullets are not the same length, so if you want meaningful info you should contact the caster you want to deal with. Link to comment Share on other sites More sharing options...
bgavin Posted August 23, 2020 Author Share Posted August 23, 2020 I reached out to Missouri and a few other casters... no response. I have the measurements from the various mold makers. I guess that will have to do. Link to comment Share on other sites More sharing options...
John Boy Posted August 23, 2020 Share Posted August 23, 2020 OK, you might want to know that a 357, 158gr bullet length is the same as a 38 Spl 158gr bullet. The difference is a 357 case is longer ... length Is 1.559 and a 38Spl case is 1.555”. The same bullet is used in both calibers Again, Why do you need to know the bullet length? Link to comment Share on other sites More sharing options...
Two Shoots Posted August 23, 2020 Share Posted August 23, 2020 Chey Cast HiTek coated RNFP, 158 grain is .647” long, Their crimp groove is .283 from the nose. Link to comment Share on other sites More sharing options...
bgavin Posted August 23, 2020 Author Share Posted August 23, 2020 2 hours ago, John Boy said: OK, you might want to know that a 357, 158gr bullet length is the same as a 38 Spl 158gr bullet. The difference is a 357 case is longer ... length Is 1.559 and a 38Spl case is 1.555”. The same bullet is used in both calibers Again, Why do you need to know the bullet length? I will spell it out for you: I want to know the length of the bullet for twist calculations at various FPS velocities. I want to know the seated depth of the bullet, for case volume calculations. I did not ask about COAL or Trim dimensions because those are published. Of course, the same bullet is used in 38SP vs 357 loads. If I did cast my own 158 grain LRNFP bullets, I would measure them instead of asking here. I do not cast my own bullets, so I asked those who have 158 grain LRNFP, because I don't stock any of these, and don't want to buy a sample pack. Link to comment Share on other sites More sharing options...
John Boy Posted August 23, 2020 Share Posted August 23, 2020 Throw the numbers in this calculator for twist ratio http://castpics.net/dpl/index.php/reloaders-reference/twist-rate-calculation Link to comment Share on other sites More sharing options...
bgavin Posted August 23, 2020 Author Share Posted August 23, 2020 Yep. One of the dimensions required to calculate twist is the length of the bullet. This is why I asked the question about bullet length and nose-to-crimp dimensions. In 2005, Don Miller published his work on twist calculations, with all the underlying math. I use the JBM Ballistics calculator, which is based extensively on the Miller equations. Link to comment Share on other sites More sharing options...
Springfield Slim SASS #24733 Posted August 23, 2020 Share Posted August 23, 2020 Not sure how picky your formula is, but like I said, all LRNFP 158 grain .357 bullets are not the exact same length, as there are different renditions of RNFP. I assume none of this is SASS related. Link to comment Share on other sites More sharing options...
bgavin Posted August 23, 2020 Author Share Posted August 23, 2020 My thoughts are for long range side matches. Here in CA, the air pollution from the fires is at the "cancer in 20 years" level, so I'm cabin bound. I enjoy the mental exercise of figuring this stuff out. Speer publishes full specs for their bullets, Hornady does not. There is very little published info on cast lead bullets, so I asked here. So far, Two Shoots has given me some useful info. He uses Chey-Cast bullets, and his 158 gr LRNFP is 0.647" long, with a cannelure at 0.283" from the nose. Link to comment Share on other sites More sharing options...
VICIOUS, SASS#8014 Posted August 24, 2020 Share Posted August 24, 2020 A lot of dentist on the wire today! Link to comment Share on other sites More sharing options...
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