I just got a Benjamin marauder 25 cal. I have been trying to shoot polymag predators pellets and for some reason I'm having difficulty closing the bolt. Have any of you have experienced this problem?

It could be the o-ring seal.

It should be tight, but not too hard to close the bolt.

O ring lube helps. Mine is a bit stiff also - probably just the nature of the beast..

Sounds like the batch of polymag's are a bit large in diameter and you have to force them into the chamber.

Do all other pellets chamber normally?

One of the Beeman pellets I tried out in my Discovery did that, seems that the skirts were flared out a hair too far. Didn't shoot those worth beans either...

Sorry for the late reply, I guess I have to agreed with LouisB. I try two others brand I had no issues.

Thanks