Crossing one way or the other its always good to be forthright( honest, straightforward, direct, open, sincere and honest). We all know guns are a concern, as well as criminal records, without full pardons or release of past criminal charges your not going to get through. So, educate yourself, boarding crossing regulations/agreements are available at both Government websites. I think checking Gov., websites would give one the correct info rather then relying on forum anecdotes.
a while ago a fellow tried to cross into Canada, he had prohibited (Canadian gun laws) magazines but said he did not have the firearms to go with them. When questioned, the fellow said he left his rifles with his Dad who was to ship them to AK, to which was his final destination. The CBSA contacted his father and to their amazement, the father did not have the firearms nor did he know anything about shipping said firearms. They searched his vehicle and found the firearms belonging to prohibited magazines and more... he was denied entry.