velocity problem 98c

I recently added some new parts to my 98 custom and am having problems getting my velocity right. I added a 14" teardrop, expansion chamber kit, a 32 degrees venturi bolt, and a 32 degrees coiled remote. I use a 20 oz CO2 bottle. The problem is that I can not get the velocity to go above an average 240 fps no matter how much I unscrew the adjuster. It was also very inconsistent. The highest shot I got was 273. Some of the balls were not shaped too well which may account for the consistency problem. I found no sign of any leaks.

I plan on swapping out parts to try and locate the source of the problem next weekend and am wondering if anyone has any other tips before I do so. I will also be trying several different paintball brands. My valve bolts are tight, but the head is stripping on one and will need to be replaced. I was careful when cleaning the loctite from the vavle when installing the expansion kit to not get any debris in there.

So does anyone have anything else to try? Any help is appreciated.

Take your each upgrade off and test your gun after each time. You'll find out the problem sooner or later.

Check to make sure there are no small leaks anywhere on the gun.  Also make sure all your screws and 2 valve screws are in.  If there are not this can be the problem. 

If you have all your or screws, switch the bolt back to the stock one and see what that does.

TRAVELER wrote:   It's going to be your venturi bolt. I don't know of any bolt that works better than the stock one, and I've heard plenty of complaints about velocity problems when using aftermarket bolts.   It may not be necessary to use an expansion chamber when using a remote line, using the remote or the expansion chamber by themselves will probably help consistency.

Remote and Expansion chamber help each other out. You have better consistancy with both than you would with one or the other.

maybe its the drive spring unless its a new gun, but Im betting its the bolt also

Holy huge bumpz0rz batman.