Will probably work fine for a few flights. I used .45 cal brass on one of my av-bay and ended up switching it out for a 1/2" copper pipe cap because the brass on the drogue side of the av-bay kept getting damaged when that part of the payload section hit the ground first.
I've found that 1/2" copper pipe caps can hold about 4g of BP, the 3/4" caps hold about 6g of BP. Not sure what the 1"caps will hold, but expect they would be somewhere around 10g.
I've had a few of the copper pipe caps that were retired after 50 flights, but I'm positive they would have been good for +150 more. They just work and never seem to get damaged, just dirty. Just use a SST screw to attach them so it doesn't degrade either. They may cost a $1 or $2, but they will last longer than the rocket. Saving money is fine, but having to bother with replacing damaged, cheap wells, is false economy to my way of thinking.