I'm not sure how custom guns work when crossing the border. I would definately make a call and find out how to specify that on your paperwork. We have never had any problems at the border traveling to and/or from but have always had our forms filled out and ready when we got there. The border people have always been helpful.
I'm pretty sure that you can not take a gun chambered in a modified case. (ie. ackley improved) The case must bear the headstamp of the cartridge you're shooting. For example, you can take a 7mm stw but your brass has to have 7mm stw on it. You couldn't make your rounds from 8mm rem mag brass. If discovered, you could have some problems.
Either way, have fun on the trip and good luck.
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