Originally Posted by C.Eaton
Over 45yds and under 12fpe the average .177 pellet is starting to become unstable unless it's spun properly which doesn't seem to happen properly with the ST barrels at lower power levels. Maybe at higher power the smaller amount of twist is amplified which probably isn't the right word, but because the pellet is given more twist it stays stable further out? Who knows for sure.
I do know, is that my experiments with .223 rounds over 600yds have shown that generally faster is better and faster, with longer bullets is even better, so there must be an ideal shape pellet for the ST barrels over 45yds, it's just a question of finding it.
Just out of interest does anyone know roughly what the twist rate is on the ST barrels?
Edit: Did a bit of delving and some chap on a BR forum reckons that the ST barrels come in at 1:96" twist. Now considering that most .177 barrels are around 1:17 to 1:19" that does sort of suggest that only spinning a pellet for 1/5 of a rotation before unleashing it on the World doesn't work, which is borne out in real World tests.
Makes you wonder what they were on when they came up with the concept....
A small history lesson....smooth twist barrels were first used in ye olde smooth bore canons, funnily enough they didnt work that well over 200 years ago, so some smart arse put 4 groove rifling in them which worked a treat!, though the french and spanish armys/navys were not all that impressed. LoL.