Esoteric barrel length/twist/bullet lube-wear question

obx22

Troubleshooter
Full Member
Minuteman
Dec 28, 2020
327
237
N.C.
Would there be a difference in the amount of lube worn off of a rimfire bullet with straight rifling vs fast twist rifling?
I’m trying to understand the physics of why a certain twist rate fits better with a certain length barrel. I’m wondering if it’s barrel wear on the exiting slug which determines one length barrel groups better than another for a given twist rate. Is the answer purely in “bore time”, with fast twists combined with longer tubes allowing a stabilizing of pressures/burn and speed?
 

Rimdenter

Gunny Sergeant
Full Member
Minuteman
Feb 27, 2021
586
483
Texas
GOOD LUCK! You have opened the door to what we call the abyss! of RIMFIRE !
 

LeShagal

Private
Minuteman
Jul 5, 2021
18
24
IN
Would there be a difference in the amount of lube worn off of a rimfire bullet with straight rifling vs fast twist rifling?
directly to your query;
If one were to "unwrap" the helix, A fast twist barrel has more inches of rifling than a slow one.
Assuming the lube is finite and "wears off" in X number of inches of rifling....it would "wear off" sooner in a fast twist barrel.
 
  • Like
Reactions: obx22

obx22

Troubleshooter
Full Member
Minuteman
Dec 28, 2020
327
237
N.C.
directly to your query;
If one were to "unwrap" the helix, A fast twist barrel has more inches of rifling than a slow one.
Assuming the lube is finite and "wears off" in X number of inches of rifling....it would "wear off" sooner in a fast twist barrel.
directly to your query;
If one were to "unwrap" the helix, A fast twist barrel has more inches of rifling than a slow one.
Assuming the lube is finite and "wears off" in X number of inches of rifling....it would "wear off" sooner in a fast twist barrel.
GOOD LUCK! You have opened the door to what we call the abyss! of RIMFIRE !
So many things to ponder. Hollywood has us believing bullets are burning hot on impact.
I’d imagine a rimfire round couldn’t be all that warm, but wonder if the radiant heat from either bore friction or atmospheric friction has an impact on either velocity (the way the air flows over the surface), consistency, or accuracy? I’d think a slug leaving a fast twist is a lot hotter than one leaving a slower twist.