Hi Peter,
Do you see this behavior only for the part of the projectile that is displayed with red circle in your picture? If so, it appears that a portion of the projectile which is eroded from the main part is passing through the target. You can check the *CONTROL_CONTACT card where the entry “enmass” indicates how eroded nodes should be treated. If this variable is set to zero, the eroded nodes are simply not considered in the contact algorithm that might be the problem in your case.
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