Perhaps a stupid question, but please give me some experiences and advice on this topic.

I have a o/u Chapuis double rifle and have been working up a load for practice with fmj bullets.

Is it safe to shoot e.g. 4 rounds within 30-60 seconds, with regard to the soldered barrels? I'm aware of that point of impact might change a bit, but is there any risk that the regulation will be lost if I shoot that fast, due to the increased heat in the barrels?

The main reason i ask is that we practice regularily on running targets before the moose hunting season, and also do a mandatory test that involves 4 rounds each time. To be approved, you need to make that test with good results at least three times. My plan is to wait about 10-20 minutes between every 4-shot series, to let the barrels cool down. Would that be ok?