I have a little Colt 25 and have used it many of times to euthanize hogs. It is perfect size, and did not have to worry about over penetration. One quick round to head at close range it was done. Used on pigs 70 to 200 lbs.
We have 100x120 with 17 foot side wall farm shop that has it in the side walls and is the best investment we made in the shop. Warmest I have seen it during the summer is 82 degrees with no air conditioning and it stays about 50 degrees in winter with heat from pex pipe running one wall going...