Just replaced the plastic breech on my crosman 362 with the steel breech. Tested the 5 different kinds of pellets I had to see if there was any effect. The best (rws hobbies) and worst (crosman premier ultra mag) stayed the same , maybe slightly larger groups, was hard to tell was only shooting at 10 yds over the chrony. What surprised me was the loss of velocity, about 20 fps on the heaviest and 7 fps on the lightest. Did a steel breech and barrel upgrade(longer barrel) on a 1377 and accuracy and velocity improved significantly. I'm assuming a misalignment of the transfer point, any other things that might have caused this? Applied a liberal amount of pellgun oil to the pump and velocity jumped up, but only for a few shots before gradually dropping back down. Also, the pellets are finnicky to load because of the recessed screw in the loading tray, have read of melting some candle wax or crayon to fill up the recess and may try this.
crosman 362 steel breech installed, lowered velocity
- Thread starter woodbuck
- Start date
Besides the possible transfer port misalignment, it could be the bolt is now latching ever so slightly further forward and is partially blocking the transfer port. Or if it differs in the opposite direction, the pellet skirt may not be getting seated fully past the transfer port.
Take the breech/barrel assembly by itself and seat a pellet while looking through the barrel port and see where everything comes to rest. I don’t have a 362 but I know a lot of other Crosman models of similar construction benefit from an extended probe.
Lastly, make sure the transfer port is not installed upside down. I always have to look up whether it’s long side up or long side down.
For the screw counterbore, the wax trick works well. Or if you have a leather punch, make a little disc and secure it in place with a faint bit of glue or caulk or silicone. Easy to remove when needed. And by all means replace that cursed #4-48 screw with a slotted head before the teeny tiny 0.050 hex recess fails on you.
Take the breech/barrel assembly by itself and seat a pellet while looking through the barrel port and see where everything comes to rest. I don’t have a 362 but I know a lot of other Crosman models of similar construction benefit from an extended probe.
Lastly, make sure the transfer port is not installed upside down. I always have to look up whether it’s long side up or long side down.
For the screw counterbore, the wax trick works well. Or if you have a leather punch, make a little disc and secure it in place with a faint bit of glue or caulk or silicone. Easy to remove when needed. And by all means replace that cursed #4-48 screw with a slotted head before the teeny tiny 0.050 hex recess fails on you.
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