Thread: Redundant Calibres

Originally Posted by Finnwolf

So why do manufacturers make rifles with a slow twist?

(I’m intrigued with this issue!)

because back a few years ago..read fifty or more..the fast barrel burners like 22-250 and swift would blow up projectiles ..its a balancing act,always has been and always will be ..there are three parts to it... how fast bullet is being driven, how fast its being spun and how hard/stout/soft/fragile the make up of bullet/projectile itself

you can drive a solid copper just about as fast as you want and spin it as fast as you want and it will hold together...within reason
soft lead you drive too fast,or spin too fast and it will foul rifling really fast,stripping off leadinto grooves and fast enough it wont make it to target,will just turn into dust on the way...you can vapourise a varmit projectile in a 22-250 easy enough now...
slow down the twist and its more forgiving..... projectiles can still be driven fast and hold together..within reason.
if we all has fast twist barrels...the guys pushing projectile slowly would be fine..but stoke it along and it would have to be so darn hard it would struggle to expand at all once it slowed down a bit.
the expansion thing is ALSO two fold....there is straight out squashing effect..like car hitting brick wall and crumpling and then there is the spin..think of bucket of water swung around in arc..its pulling outwards,centrifugal force...rounded figures a pill going 3000 fps in a 1;12 twist is doing 180,000 rpm so its trying to pull itself apart...