Thread: Building a test fire tube / bullet trap

I did the hole for a mate using my post hole borer and the strainer auger. Extending the auger shaft I got a 1.8m hole. I bored it at a roughly 45 degree angle. The bottom was soft clay. All this in his lock up walk in safe in his basement. He then put a spiral welded pipe down and partly filled with layer of sand (not much) at the bottom. The top of the pipe was roughly 1/2m out of the ground so effectively an over 2m tube. Capped the top with a wooden cap with a barrel sized hole (~30mm , no damage to barrels). He never got any blow back and the noise was a muffled woomp which couldn't be heard upstairs in the house. The noisiest part of the deal was boring the hole in a confined space.

I did a similar thing for myself, but unlined, and capped with a concrete paver with a suitable hole in it. Same depth. Beside my hay shed. I used it to fire 2 fowling shots before heading off to my fullbore club days. My animals never even looked up from eating when I fired into it. Unfortunately when I went to use it for the start of a new season I got showered in muddy water and mud even went up the muzzle. The hole had basically collapsed over the off season and filled with water! I intend doing another up by the house where the groundwater shouldn't be a problem.