Thread: 180 ELDM Blowing up

Originally Posted by Micky Duck

alright Ill bite....WHF are you fellas running such tight twists???
I can understand the 1 in 8 for .223 wanting to run heavies eg 80 grn.....still think may as well use .243 ...but why on earth do it in 7mm mag etc???
some of us run 170grn projectiles in bog std 1 in 10 twists with great accuracy going somewhere in mid/ high 2000s and no issue with 150s going quicker...
Ive been accused of looking for dinosaurs to hunt when using 180s in .308 for bush work.... why are you wanting such a heavy for calibre projectile???? and why are you torturing it so extremely with tight twists???
and Jit....the fella you mention ALSO mentions stupidity of extreme speed in tight twists...
maths for you..... 3000fps at 1 in 12 twist= 3000 turns per second X 60 seconds per minute = 3x6=18 add zeros 180,000rpm now make it 1 in 8 twist and you increasing that by 30% so 220,000rpm
once upon a time when the 220 swift was first being played with guys were having same issues you fellas are now...for the same reasons.
you can only swing that bucket full of water around above your head so fast before the handle breaks... projectiles are spinning so darn fast they trying to pull themselves apart the effect of that rifling most create one hell of a lot of heat too... you have ALWAYS needed a hard projectile if you want to drive it fast.... you now driving it fast AND speeding up the spin..... issues were bound to follow.
now if SOME of you fellas are having these projectiles disintergrate in mid air.....yes some arent.... how the hell can you ethically use them on anything other than paper????
its always been touchy subject re varmit type projectiles in the .224s for big game.... head or neck or crease or dont bother...how is what you doing any diferent??? yes its 180grns of little bits,but they still little bits,you have defeated purpose of going heavy....for it to stick together and penertrate deep breaking bones etc...

Physics...the fast twist is needed to fully stabilise them and achieve the highest bc possible for better ballistics at extended ranges. I know some people run them from 1:9 barrels but they are unlikely to see the full potential of the bc.
I haven’t had any issues shooting the 180 ELD-M’s at 3060 from the 7 Blaser in a Bartlein 1:8 5R and they absolutely hammer game at extended ranges.