Trying the accuracy question one more time...

[Snap_Dogg]

Originally posted by hitech


I can understand that. What is tight enough to break balls? My stroker has what seems to me to be a "tight" barrel (tighter that a Dye something or other, SP Progressive and stock mini mag barrels) put it NEVER breaks balls in the barrel. The only breaks I get are "chops".

Also, do you think a tighter that optimum fit is less accurate?

Thanks.

part of the reason you sometime get chops is like you said the ball is too big and wont fit through the barrel at the first part and then just pops

[hitech]

Originally posted by ronron2112
...the better the match, the less the ball will "wobble" on the barrel, so the air can push on the ball with a constant force. If the ball can move in the barrel, it can upset the flightpath.

It makes sense that if the ball "wobbles" in the barrel it would upset the flightpath. However, why would it need to have a good "match". Shouldn't it need to be tight enough? If it was "too" tight it shouldn't "wobble", right?

[hitech]

I stopped by Palmer's yesterday and spoke with Larry (he's been there for a long time). I asked him about the elliptical honing thing. He told me that is in fact what they do. My old stroker (PMI 1) had a tighter barrel that the stock they use for making barrels now, so the difference is greater. In both the barrels they make and in my old conversion the center is honed to the same diameter (.690 I think he said). I have NO barrel breakage problems with the stroker, including the PMI Premium (with the advantage shell). VERY interesting.

[HyperSnyper]

Hitech,

I am new to the eliptical honing process, does this mean that the bore is actually an "oval" versus a perfect "circle".

As for the paint matching, you can read Tom's tech tip about matching.

Basically too tight a fit would create excess friction. The tight bore may be too small where it will force the ball to deform small and implode inside the barrel.

If in fact it does make it out the barrel, the excess fricton will cause certainparts of the ball to grab the walls and cause a spin. When it exits the barre, it will hook enough to be off mark.

A perfect paint to barrel match will be large enough toreduce friction, but small enough to make a good seal between the walls and the paint shell. When it makes a good seal, you will get more consistent results since the seal will ensure the same amount of gas is used to propel the ball and not bypass the seal.

Too large a bore and you got balls rolling out. In the case with guns with ball detents, there will be a great loss in efficiency. There will be excessive amounts of gas bypassing the ball and will cause a great fps drop and inconsistencies. My spyder and Boomy (think its a 690 bore) does not work well with Allstars and Infernos, my GF was shooting it and had to up it an extra 50 psi to compensate. Used Slamball instead and the fps jumped since the paint had a better match.

Read Tom's Tech tips if you want to read the article he wrote. And read my post about how recoil can affect your accuracy and how the Superbolt will be the solution.


-Hyper

[laysomepaint]

im not sure if that really effects accuracy, but i know that if you have the "perfect" barrel to paint match, your efficiency will be better. Tighten the bore: more friction, more force needed. Loosen bore: more gas escaping around ball instead of pushing it, more gas needed.

[hitmanng]

Wow I am not sure I even want to get into this again. It is primarily a question of fluid dynamics. Short of breaking a ball the spin imparted will have little or no effect. Efficiency is an issue but not your question. Imagine you are shooting a sling shot not a Mag. All the air before the release is just pushing. The question is what are the forces on the ball as it exits the barrel. If the barr is bouncing around a large bore or the stepped bore of a stepped bore barrel then acuracy will decrease due to the fact that it is not headed in a straight direction when it exits the barrel.
On the other hand if the ball needs to deform significantly to make it out of the barrel the expansion on release can make the ball bounce out into another direction. ei a curve shot. The point is these are extremes. One larger barrel and one standard barrel should suit anyone. If you are going from Big ball on a humid day to RPS advantage shells you cannot use the smae barrel. If you don't believe me put both in your hopper and take a new shot on a humid day. Generally speaking most paint can go through most barrels if they have no defects and are not bent without a problem.
Hitmanng