I read your location as Eastern Canada (not Carolina) and balked at the idea of shootings. Then I looked more closely.

Back to topic, and those tires should be fine on packed gravel, especially if it's a rail trail, and hence not hilly. Just take it slowly, and if you see that the gravel is loose rather than packed, take it even more slowly. Imagine it's like driving on a wet or slightly icy road, so think ahead and try not to brake too fast.

Have fun.