Marauder

the transfer port may likely have a burr on it which snags the pellet as it is being pushed into the barrel with the bolt/probe.

very common issue and it shears the pellet, often causing some inaccuracy/misalignment of the pellet in the barrel.

If you remove the barrel and try sliding a bamboo skewer over the transfer port you may feel the burr and it will shave the skewer.

Guys who tune marauders usually carefully remove the burr with a dremel and ball grinding tool.