I’ve finally started on the relief carving of my first rifle. I have a wood patch box and I want to add the thumb catch. I’m looking for recommendations as to what size gouge I should use to carve it out. It’s going to about 12mm wide. I have limited gouges and nothing very wide- needless to say I have to buy one. I have discovered that the gouges I previously bought were too wide so I have been down sizing and I don’t want to make another buying mistake. Thanks!