The Eigenbarrel

[Frizzle Fry]

Florida.

Any place with high humidity... I road tripped down to GA to play with old college buddies last year. My friend and I (both having digicalipers in our kits) measured and inserting accordingly but upon arrival we found that our balls had grown (be mature ) along the trip, which also resulted in misshaping what was left upon our return. The shot fine after going from .684 to .691 but back in MA they were ovoid and averaged .688 and splattered like waterballoons in the barrel. This was all over the course of a week and they were living in regularly jostled/agitated bags.

[cockerpunk]

in the summer when we get 95 degrees and extreme humidity, we still have small bore paint.

[Loneassassin]

i have no idea where poeple are finding .685+ paint.

i often have rollouts out of my .679 python. forget underboring, just to prevent a rollout you need a barrel like this around here. underboring a huge bonus when you get the chance to do it though.

Ditto. Only in my dreams can I find paint bigger than .682, lol. This includes Marbalizer. I haven't used a barrel back larger than .682 for years. And with some of the cheaper or mid range paint, I have had rollouts in my cockers using a .679 Freak insert with TWO pieces of electrical tape in the breech end. Maybe GI Milsim is in cahoots with the paint companies to force .50 cal on us slowly over time...

Anyway, this is actually one of the reasons I'm in the market for a Mag - I'm sick of dealing with tiny paint rolling through even my smallest Freak insert. And on an open bolt marker, it doesn't really matter...

[kcombs9]

Maybe GI Milsim is in cahoots with the paint companies to force .50 cal on us slowly over time...

My thoughts exactly

[CatoRockwell]

I was going to say that humidity shouldn't have much to do with our large paint. UT is a desert, almost no humidity ever. In fact people who come here from other states often find that they get dehydrated easier and also tend to get dry and cracked skin.

[Rudz]

I've got. 4 kinds of paint in the last 2 months, evil was 684, ultra evil was rolling out of a 681, and I have marbs and premium, both at 682

So yeah, I'm thinking this barrel might help rollouts on my sniper, but I want to see it tested

[Poe]

you can easily do the same experiment at home or at the chrono station.

take the front off your 2 piece barrel, fire a few shots, then stick the front back on and take a few more shots. they will be higher in velocity.

means that this "the mm the ball hits a port the barrel is over" business is the hype. the expanding gas does continue to push the ball even after it hits both the massive overbore of a barrel front, and the porting.

Cockerpunk,

Considering barrel pressure after five inches is quite low and it's trying to evacuate in less than 1ms.. this is understandable, but just out of curiosity what additional "control bore" distance does the front add? Since the front's porting doesn't start where it contacts the insert, the front does add some additional "control bore" distance doesn't it? What's the back only control bore distance vs the back + front (measured to first port) distance?

[cdc120602]

Just thought I'd add my $0.02. I played in 10 degree weather with Polar Ice this weekend in Eastern Ohio (Battlefront). I had my .682 Freak insert installed and the paint was still rolling out! It wasn't even close! Maybe I should look into this. Maybe I should just wait till summer to play...lol On the plus side, my cheater was amazing!

[cockerpunk]

Cockerpunk,

Considering barrel pressure after five inches is quite low and it's trying to evacuate in less than 1ms.. this is understandable, but just out of curiosity what additional "control bore" distance does the front add? Since the front's porting doesn't start where it contacts the insert, the front does add some additional "control bore" distance doesn't it? What's the back only control bore distance vs the back + front (measured to first port) distance?

on the CPs the short fronts only add about a quarter of an inch before the first ports. i think that is what your referring to.

[xluben]

Lurker barrel arrived today:













More info and pictures here:

http://www.pbnation.com/showthread.php?p=64627922

[drg]

means that this "the mm the ball hits a port the barrel is over" business is the hype. the expanding gas does continue to push the ball even after it hits both the massive overbore of a barrel front, and the porting.

Not only that, but TK's results only pertained to efficiency. Sound signature is in fact a part of barrel performance, so there would be a point to porting even if it had no influence on efficiency.

[cockerpunk]

Not only that, but TK's results only pertained to efficiency. Sound signature is in fact a part of barrel performance, so there would be a point to porting even if it had no influence on efficiency.

im going to come out and say that the ONLY point to porting is sound signature.

[kwood]

so xluben
have you tried it out yet?
we are all anxious to here about how she does

[drg]

im going to come out and say that the ONLY point to porting is sound signature.

Yes porting per se, however I'm talking about how you mentioned a ported section doesn't equate to no barrel at all when it comes to propulsion.

[cockerpunk]

Yes porting per se, however I'm talking about how you mentioned a ported section doesn't equate to no barrel at all when it comes to propulsion.

right, however it is significantly worse efficiency wise compared to even an unported overbore.