Vicious_CB Posted October 22, 2018 Report Share Posted October 22, 2018 24 minutes ago, Sturgeon said: This is 4.9 inches drop at 200m: That's a 5.5" B8 bullseye target, similar in size to a human heart or vital zone in the head This is representative of 6.5 Grendel 123gr ammo from a 20" barrel or 100gr Grendel from a 14.5" barrel The bigger circle is the extreme spread (2.5" at 100 meters), the smaller circle is a representative mean radius (0.865" at 100 meters) Now, this is a 50% pH at 200m target And you need less than 2.7" drop at 200m to achieve that. M855A1 has 3" drop at 200m with a 100m zero. Are they still going on about the 6.5G being the universal cartridge and all that? Ive always thought 6.5G had it ass backwards. I want flat trajectory at the distances I would typically be shooting at(300m and in) and don't mind more drop further out since past a certain point the difference between a 5 and 6 mil drop at 800m is moot point using the hashmarks on your reticle. IMO the design philosophy behind the 5.45 cartridge is just right. Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted October 22, 2018 Report Share Posted October 22, 2018 1 minute ago, Vicious_CB said: Are they still going on about the 6.5G being the universal cartridge and all that? Ive always thought 6.5G had it ass backwards. I want flat trajectory at the distances I would typically be shooting at(300m and in) and don't mind more drop further out since past a certain point the difference between a 5 and 6 mil drop at 800m is moot point using the hashmarks on your reticle. IMO the design philosophy behind the 5.45 cartridge is just right. You'd love the 5.7mm Hermes, then. Quote Link to comment Share on other sites More sharing options...
Vicious_CB Posted October 22, 2018 Report Share Posted October 22, 2018 3 minutes ago, Sturgeon said: You'd love the 5.7mm Hermes, then. My search yields information on Two Tone Gold 5.7mm 14k Diamond Cut Comfort Fit Wedding Bands instead of ammunition Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted October 22, 2018 Report Share Posted October 22, 2018 3 minutes ago, Vicious_CB said: My search yields information on Two Tone Gold 5.7mm 14k Diamond Cut Comfort Fit Wedding Bands instead of ammunition That would be because I designed it. Think .224" caliber Grendelized 5.45. Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted October 22, 2018 Report Share Posted October 22, 2018 Here it is: Quote Link to comment Share on other sites More sharing options...
OnlySlightlyCrazy Posted October 22, 2018 Report Share Posted October 22, 2018 You should drop some more info on 5.7 Hermes.And enter it into NGSC Quote Link to comment Share on other sites More sharing options...
Miroslav Posted October 22, 2018 Report Share Posted October 22, 2018 .224 valkyrie? Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted October 22, 2018 Report Share Posted October 22, 2018 5.7mm Hermes would use 5.45 brass cases, blown out and necked (slightly) up for .224" caliber projectiles. Case capacity is 29.5 grs H2O. It's designed to propel a 57gr very low drag VKO bullet at 3,000 ft/s from a 14.5" barrel. Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted October 22, 2018 Report Share Posted October 22, 2018 Here it is with the VKO instead of the placeholder bullet: And here's the QL data: Quote Link to comment Share on other sites More sharing options...
OnlySlightlyCrazy Posted October 22, 2018 Report Share Posted October 22, 2018 You wouldn't mind gracing us with an estimated G7, would you? Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted October 22, 2018 Report Share Posted October 22, 2018 0.197 Quote Link to comment Share on other sites More sharing options...
Vicious_CB Posted October 24, 2018 Report Share Posted October 24, 2018 On 10/22/2018 at 10:30 AM, Sturgeon said: 5.7mm Hermes would use 5.45 brass cases, blown out and necked (slightly) up for .224" caliber projectiles. Case capacity is 29.5 grs H2O. It's designed to propel a 57gr very low drag VKO bullet at 3,000 ft/s from a 14.5" barrel. I like it! Thats quite a long 57gr bullet, it should have some nice flight characteristics and good terminal ballistic potential. Some guys did a doppler radar regression of the 7n6 bullet and the results were quite surprising, it had a BC similar to a 77gr SMK, I need to check my notes to see exactly what is was but it was ahead of its time, basically 5.56 NATO 2.0 but made with shittier materials. Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted October 24, 2018 Report Share Posted October 24, 2018 1 minute ago, Vicious_CB said: I like it! Thats quite a long 57gr bullet, it should have some nice flight characteristics and good terminal ballistic potential. Some guys did a doppler radar regression of the 7n6 bullet and the results were quite surprising, it had a BC similar to a 77gr SMK, I need to check my notes to see exactly what is was but it was ahead of its time, basically 5.56 NATO 2.0 but made with shittier materials. IIRC ARL doppler testing of the 7N6 bullet showed an 0.168 G7 BC. For 7N22 it clocks an 0.180 G7. Quote Link to comment Share on other sites More sharing options...
Vicious_CB Posted October 24, 2018 Report Share Posted October 24, 2018 Not as high as I thought but still pretty good. Are you using the all "green" construction for the EPR bullet 57gr bullet? I wonder how much extra case capacity you can get by going with a regular lead filled base instead of copper. Or just do it like the russians with a full length penetrator.. Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted October 24, 2018 Report Share Posted October 24, 2018 21 minutes ago, Vicious_CB said: Not as high as I thought but still pretty good. Are you using the all "green" construction for the EPR bullet 57gr bullet? I wonder how much extra case capacity you can get by going with a regular lead filled base instead of copper. Or just do it like the russians with a full length penetrator.. I definitely recommend reading my articles on BC and form factor: https://www.thefirearmblog.com/blog/2016/05/13/ballistics-101-ballistic-coefficient/ https://www.thefirearmblog.com/blog/2016/05/16/more-on-ballistic-coefficients/ https://www.thefirearmblog.com/blog/2016/06/09/ballistics-101-form-factor/ Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted October 24, 2018 Report Share Posted October 24, 2018 The construction of the 57gr VKO is similar to that of M855A1. Quote Link to comment Share on other sites More sharing options...
Oedipus Wreckx-n-Effect Posted October 27, 2018 Report Share Posted October 27, 2018 Tritium safety selector.... Why... Quote Link to comment Share on other sites More sharing options...
That_Baka Posted October 31, 2018 Report Share Posted October 31, 2018 @EnsignExpendable Looser'd https://forums.spacebattles.com/threads/a-new-rifle-for-russia-the-ak-not-the-first-kalashnikov.648275/#post-47421080 Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted October 31, 2018 Report Share Posted October 31, 2018 That's not... That's not how "LoooSeR'd" works. Oedipus Wreckx-n-Effect, EnsignExpendable, That_Baka and 1 other 3 1 Quote Link to comment Share on other sites More sharing options...
Oedipus Wreckx-n-Effect Posted October 31, 2018 Report Share Posted October 31, 2018 Quote Link to comment Share on other sites More sharing options...
Ramlaen Posted October 31, 2018 Report Share Posted October 31, 2018 It would be helpful if BAE Systems at Radway Green produced a 6.5 mm projectile along the same lines as those it developed for its excellent 5.56 mm and 7.62 mm EP enhanced performance rounds. This is because, so far, no European army has adopted US EPR projectiles due to concerns about whether they are compliant with the Laws of Armed Conflict. EPR bullets have an exposed steel tip for improved penetration and jacket is designed to rupture so that the bullet will fragment for improved lethality. Projectiles that fragment or deform are prohibited. I am by no means an expert but I am pretty sure SS109 fragments. Quote Link to comment Share on other sites More sharing options...
Oedipus Wreckx-n-Effect Posted October 31, 2018 Report Share Posted October 31, 2018 2 minutes ago, Ramlaen said: It would be helpful if BAE Systems at Radway Green produced a 6.5 mm projectile along the same lines as those it developed for its excellent 5.56 mm and 7.62 mm EP enhanced performance rounds. This is because, so far, no European army has adopted US EPR projectiles due to concerns about whether they are compliant with the Laws of Armed Conflict. EPR bullets have an exposed steel tip for improved penetration and jacket is designed to rupture so that the bullet will fragment for improved lethality. Projectiles that fragment or deform are prohibited. I am by no means an expert but I am pretty sure SS109 fragments. But it "wasn't designed" to do that. M193 frags but "not by design". But it's a trite clause at best. We could say the main design is to punch a hole in paper. But if it just so happens to violently expand and induce polonium poisoning then that's totally not the main design. Totally an accident. Just a little fluke. Lolz we already made some so piss off. That_Baka and Ramlaen 2 Quote Link to comment Share on other sites More sharing options...
Ramlaen Posted October 31, 2018 Report Share Posted October 31, 2018 I can't read this but it appears to have a diagram of NM255's two piece steel construction. https://www.ffi.no/no/Publikasjoner/Documents/FFI-Fakta_nr1_2012_NyAmmunisjon.pdf Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted October 31, 2018 Report Share Posted October 31, 2018 1 hour ago, Ramlaen said: It would be helpful if BAE Systems at Radway Green produced a 6.5 mm projectile along the same lines as those it developed for its excellent 5.56 mm and 7.62 mm EP enhanced performance rounds. This is because, so far, no European army has adopted US EPR projectiles due to concerns about whether they are compliant with the Laws of Armed Conflict. EPR bullets have an exposed steel tip for improved penetration and jacket is designed to rupture so that the bullet will fragment for improved lethality. Projectiles that fragment or deform are prohibited. I am by no means an expert but I am pretty sure SS109 fragments. Isn't UKLandPower Drummond's blog? Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted October 31, 2018 Report Share Posted October 31, 2018 Also fragmentation is not prohibited unless you are asking the UK's multicultural lawyers. Quote Link to comment Share on other sites More sharing options...
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