Common B3 velocities

[xschug3]

I just picked up my first B3 the other day and I don't have a chrony. Its seems to have decent power but I'm curious what kind of velocities people generally get with an untuned B3. I should specify pellets weights: 7.9 gr to 8.4 grains are what I shoot, so those would be most applicable velocities. I believe this is the b3-3 model, the newest one...?

[shadow]

I think most of the B series shooters push around the mid 400fps mark. I just tuned two of them for a friend and his son and put em across the chrony before the tune. The first one shot a 280fps avg. :0 and the second one 380fps avg. :0 . I debured, honed, polished and conditioned the leather seals then installed a new spring. When the got them back the first one jumped to 600fps and the second one settled in at 610fps avg.. They were pleased with the smoother shooter and consistent accuracy. Ed

[daveshoot]

I just tried a new Cummins B3 out of the box over the chrony. I cleaned it up a little with Goo Gone, including the bore, and let it dry for a bit. Might have been dieseling, but there was no detonation, just the fine mist of internal soy sauce.

Anyway, a two shot string was 593 and 600. I was giving it to a colleague who has the bug, so that was all I did, but I was impressed. Maybe it will settle down with some use, or maybe we got a pick of the litter. Hard to tell with those things. We are gonna open her up and work on it in a few weeks.

I was not able to get the rear sight down enough, like the screw was jammed up or too long, but otherwise it seemed fine.

[shadow]

WOW! them are some good #'s out of the box Dave the two that I just did were the older models that they got off the CUMMINS truck several years back, they shot em several times then put them away. I know that the QC is getting better on the newer models too. Ed

[xschug3]

Those are good numbers. I know that my gun shoots around 500-600. I can tell by its power that it's putting out at least that. The guy I got it from told me it's an 800fps, but who knows. I know he didn't chrony it

[ronbeaux]

I went out and checked mine today and it shoots 620 with Crosman Premeir Hollow Point pellets. All I did to it was smooth parts and lube tune it.