Anyone ever chrony a b2-2 ?

[naildigger]

Curious about real velocity of this gun in .177 or .22 ..........South Summit calls it a b2-245 i think. Thanks...James

[howie1a]

I've got a B2-255   22 cal.  for sale in the classified it is tuned as well as the stock refinished and cut down in length and has a scope and muzzel break on it it's also been re crowned and choked,  it does on an adverage of 459 fps  with crosman 14.3 hp. pellets and that works out to a 6.69 ft. lbs.   it is a very nice rifle , I don't own a chrony but Warren has one and he was nice enough to  let me chrony all my rifles last week , howie1a   PS  their is a 19 fps spread.

[bil601]

I had a .22 cal up to 520 fps (14.3 gr CPs) with the spring shimmed as tight as it would go. It was pretty nice for what it was, lite recoil, accurate, smooth. Only problem is the leather breech seal kept blowing out  & the Vel would go up & down.

[naildigger]

Charles,
How much thickness were you able to add when you shimmed the spring? On the B2?

Thanks...James

[naildigger]

OK. my daugter has a b1-1 break barrel, She has shot around 400 pellets through, I tore that thing down to have a look at the inards. here is what I found

The leather breech seal is doing it's job, Barrel lock up is good and snug, no play.

On the inside, compression chamber is actualy pretty smooth, the piston is realy rough, plenty of burrs and bad machining marks, the leather piston seal is hard as a rock and tight in the chamber still plenty of china lube in there, and the leather seal is deformed and starting to tear seperate, the ends of the spring are not even and are very sharp, the trigger sear engagement on the piston rod looks ok, and the trigger looks ok also, the trigger although a little hard was fairly smooth on this one. When cocked the spring is near coil bind, just guessing while I took it apart about 2 + inches of pre load on the spring, and as noted before the spring is almost coil bound when cocked. The transfer port is drilled of center, and does not align quite right with the barrel bore, close but not quite.

I'm curios if the b1-1 and the b2-2 use the same spring, and have the same compression stroke?

I'll polish this b1-1 up a little and reassemble, with a new seal. and see what happens.

[bil601]

I dont know about the B1s. If I remember the B2 has the hole in the center of the tube then angles up to the barrel. I never measured the shimes I just kept adding washers untill it wouldnt cock then took one out. The only thing I did to the trigger was debur & cut some of the return spring. The .177 I had would do a very consistant 650 with daisy wad cutters. ( also shimmed up)