FX STX carbon fiber liner sleeve.

Good points bigHUN. Straightness will be an issue with or without a CF sleeve around the liner. I think it is a case of reducing variables. Some people index their barrels so the bias is vertical, so it may be compensated for with turret clicks. The potential for a slight bias will always be there and if it can be predictably compensated for, then it can be managed.

The issue that is more of a wildcard is that of harmonics and the way that an wave travels through the liner and changes the relative orientation of the plane of the exit of the barrel, and hence the internal surfaces that the projectile is in contact with. Due to Newton's laws, we know that every action carries and equal and opposite reaction. In a flexible system we can assume that the heavier the projectile or the more energy that is being transmitted through that system, the more extreme the movement due to the energy waves being transmitted when the projectile starts to move. 

It makes sense that a more rigid system will minimize the oscillations, and thus potentially be more predictable...especially if various projectile weights or power settings are to be used. This is the theory and it does make sense, but I would like to see some tests. I do not think that it would be perfect, but it might at least take away wave form related variables from the equation and make the performance more predictable; especially in situations where ammo of different masses or different power settings are being used.

That was my two cents anyhow...

Pat
 
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It makes sense that a more rigid system will minimize the oscillations, ...do we want to minimize the oscillation?... and thus potentially be more predictable...I don't think a rigid system would be predictable more like opposite. in archery, I index my arrows to a stiffer spine up at 12 and using very soft rest blade not to push the moving (arrow) surface to a blade contact point but only kiss it, this way I can predict that in the moment of release the shaft will bend/bow downward...here you index the liner... most likely at 6 or 12 ...especially if various projectile weights or power settings are to be used. This is the theory and it does make sense, but I would like to see some tests. I do not think that it would be perfect, but it might at least take away wave form related variables from the equation and make the performance more predictable; especially in situations where ammo of different masses or different power settings are being used.

That was my two cents anyhow...

Pat

I have a feeling that some wider soft silicon bushings (instead of round orings) would work better vs a CF rigid tube. Ppl only hate and want to replace these orings only because those moving along whenever we pull out the liner from barrel. But I don't believe the CF stiffening tube will improve the score card.

My understanding about oscillations is that the liner shall free float as much possible - inside the barrel (same as an arrow tube free floating during flight) and the oscillation shall be free of any artificial influence or there would be side effects.

I have my jig for indexing arrows, the CF tube sometimes have two stiffer and one or two weaker sides. Next time I take the gun apart I will measure and markup the spine of the liner, only I don't know what to do with that at this moment, I cannot try out indexing because this shall be reviewed by shooting at long ranges only and both gun clubs in my neighbourhood are closed, and my membership expired waiting for renewal 8-10 months !!!