Will not chamber a pellet for Crossman 357 .177 cal pellet gun

Any commercially available pellet will work. Some styles/weights/manufacturers shoot better in a particular gun than others. Impact points vary with aerodynamics/weight.
I experimented with different pellets to get the most accurate one.
Gamo makes a really good pellet.
Here's a pack with different styles -

GAMO Performance Pellets Combo Pack 177 Cal Multiple Styles 632092854 eBay

Hi Loretta.
not sure if this link will help you out,or you could try ebay.
replacement peep site for crossman pellet Gun serial no 914564969 Google...

Follow this link Steven, if you haven't found it already.

http://www.crosman.com/cs/manuals/crosman-pistols

Both manuals are about 3/4 way down toward the bottom. Hope this helps.

I have a crossman pulse r78 and it will not shoot ,when you pull trigger it Gus windes oner spring do not egage

The chamber may be worn. The pellet is just big enough to stay in the chamber without falling out. A worn chamber will allow this to happen.

Usually a 35cent seal that is now more because of shipping, call Crosman # in your manual or find at their web site.

yes it safe to shoot bb,s in the 1377 pump pistol,i have 3 of them they actually shoot true'er and with more vilocity

It looks like you pull back the slide, drop in your pellet, hit the slide release and you are ready to fire, 400 FPS, single stroke pneumatic, Made in germany, recoiless, formerly the Marksman 2004, $50.

Go to www.airgundevelopment.com and scroll down to the link that says crossman valve. I used these pictures to get mine back together. It's not an exact science, but it sure does help.

try tighnening the screw or bolt that holds the pump on the gun