Underboring/Overboring and accuracy

[Clindamycin]

Hey all,

This may be a decades old conversation, but I am annoyed by this and want to talk.

Autococker needs slight underboring/perfect paint to barrel matching so the ball does not roll out. I find I have two issues with paint - its either hard, low quality paint with inconsistent sizing; or it is higher quality paint with more consistent sizing but brittle, leading to inevitable barrel breaks that then affects all subsequent accuracy.

One way or another, I end up with pretty imprecise groupings of paint when shooting at a moderate distance. On my modern space guns this is no issue, since I just overbore. How do you guys deal with this with your autocockers? By far my favorite kind of gun, but I genuinely can't seem to get that pristine performance out of it.

Edit: Things I have attempted are barrel kit, and getting it professionally tuned to control for other confounding factors. No luck!

Teach me! Thanks!

[iamthelazerviking]

Yeah paint sucks. People have luck with a bigger sized barrel and tape or 3D printed anti rollout detents. I like the TechT iFit kit to stop rollouts, it uses a less than 2" insert and really small sizes are available. You can get away with a lot of compression without breakage.

[warbosschoppa]

Slightly overbore with and use a widget.

[Trbo323]

Edit: Things I have attempted are barrel kit, and getting it professionally tuned to control for other confounding factors. No luck!

Teach me! Thanks!

if someone told you that you would get more accuracy with their tune, then I'm sorry to tell you but you didn't get it professionally tuned.

You might, MIGHT, be and to get a little more consistency and in theory that would turn into your vertical spread being slightly less but A) unless your consistency is really bad to start with it will be minimal at best and B) good luck actually proving that the vertical spread is any better

Sent from my motorola edge 2024 using Tapatalk

[mexicanbear]

Might I suggest getting a harder shelled paint, like those for magfed. Defy is pretty consistent and it has a pretty thick shell.
someone was saying using smaller inserts. I don’t remember who, but someone had tested shorter inserts like those from nova and had decent results due to the 3in control bore. I personally use nova inserts and have not had a barrel break with GI 5 star. That being said my favorite all around paint is Valken GFX.

[Psycho91]

From what most have said on here most seem to run a .684 barrel or close to that and run the 3d printed anti roll out fingers

[Chuck E Ducky]

over bore and use these… no rollouts and you can get better consistency with less consistent paint.

Paint today is not consistent enough for an underbore. Even “good” premium paint is all over the place. I do seem to get away with not needing them with a .681 most of the time but I keep a detent ring in the tool box at all times. I buy a bunch and hand them out to anyone that runs into rollout issues.

https://www.mcarterbrown.com/forum/buy-sell-trade/dealers-forum/295003-autococker-barrel-detents