It is beyond my perception how it can be accurate.All my liners - how they press in the rifling - the rifling ends before the end of the tube 3-4-5mm inside the hole...so the crown doesn't do nothing.
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It is beyond my perception how it can be accurate.All my liners - how they press in the rifling - the rifling ends before the end of the tube 3-4-5mm inside the hole...so the crown doesn't do nothing.
No other way around it, you will need to try it for yourself. Liner in original mfg state vs liner that was cut at the end to expose the pressed "rifling".It is beyond my perception how it can be accurate.
I guess, spots where slug/pellet feels loose when pushing it through."dry spots inside" explain please, I'm guessing spots with no rifling?
Yes those newer liner comes like that, it's better in accuracy. Though they look simple round it's diameter is smaller just enough to redie the projectile into round shape just when exiting barrel. It's just a very short length so it doesn't effect with the spinning. Liner have only 3 lane grooves, and in earlier pallets FX liner the projectile are sent in triangular shape spinning. I guess they decide they want to send round spinning pallets this timeHi,
Please take a look at the leading marks of these liners:
View attachment 328875View attachment 328876
It is evident there are no lands at the very end of the bore (EDIT: muzzle end, crown). I checked a couple of liners in multiple calibers and they are all like that. I think it may be dictated by the production process of making the rifling from the outside. They can't make the rifling to the very end because it would make a constriction there as there is no more material at the very end of the barrel - the material is from one side only so the steel would react in a different way there. However, there is no problem to remove the very end of the choke using a lathe and recrown. It is more expensive in production but can it help with precision?
If you exaggerate that the liner is like here:
View attachment 328877
What's your opinion on that?
Thanks!
My bad Yes pentagonal. Still will the round projectile be better then polygonal shape? My concern is..There are five lands in the liners.
If ur accessible with machinaries. Try make one with smooth choke (not greater length then 2-3mm) and that smooth section just slightly tighter then the rest of the barrel bore (.. u can try external steel cold rolling method). And see the result , u'll surprise urself if u do that proper barrel jobI do not know any other barrel with a smoothbore at the muzzle.
I am looking forward to seeing those in Denmark, CUZ knockouts are just here in 10 and 13 grain flavor.16gr knockouts