I have a question about a piece of product. Part number: (JY6-0276) Description: (Red Strobe willow) Size: 6″

My question is if I have it set to break at lets just say 00:38:820 but the actual break comes at 00:39:320 do I still set the shell to break at 00:38:820 or do I pull it back me to match when it actually breaks?

Thank you

Matt