Thread: 308 twist rate

for short barreled subsonics up to 1-5 work great
1-5 seems to be the standard these days for the machined expanders and works just fine with supersonic
the extra rotational energy is bugger all but it gets the expanders spinning like an outboard propellor inside the target giving you a bit more energy transfer
you can go slower twist if your barrel is longer
the fastest barrel I could get in NZ was a 1-8 trueflight at the time and I am very happy with it, I would prefer faster but this is a great barrel that shoots fantastically
mine is 300blk just for subsonics

this too fast twist thing isnt the issue that its made out to be from the research
select your barrel up to stabilise the longest bullet you plan to run, but long story short 1-7 will be about as good as you can get and 1-8 will be a lot easier to find
if you can import a barrel from x-caliber barrels in usa you can get the 1-5, and pacnor did 1-6 before they burnt down and are apparently nearly rebuilt so should be making barrels again soon

I ask a lot of questions to Kevin brittingham from Q on instagram because they seem to be the cutting edge of subsonics with discrete ballistics
its wort the watch to get your head around these things

I used a 1-11 308 tikka t3 barrel full factory lenght for shooternz's 151gr cast bullets for ages before going fancy with 300blk
to be honest it is basically exactly the same outcome with the same noise but now at least i get to carry something short and light