I finally got around to chambering the 2 Lederer barrels that have been in the shop. Both in 6BRA of course. I wanted to make this post to comment on something I noticed. Borescopes are becoming more common. If you look at enough throats you will see trends. Especially in different makes. The way the end of the cut is shaped in the throat gives you an idea of the shape of the cutter or button. Its pretty common for button barrels to have a cupped land or have "wings". You can measure them with and indicator, usually .0003" or so. The cut across the land will look longer towards the sides of the land than in the middle of it. I pay close attention to the shapes I see in barrels. Kreigers for example usually have the correct radius in the groove. This will look like a straight cut across the groove, but they often have some ratchet. Ratchet is where one side of the groove is deeper and the cut will look angled across the groove at the end of the throat. Thats fine so long as every groove has that same angle in it and the length of the cut is equal on each land. Thats show your smith did his job. Some barrels have very interesting shapes in the bore. I mention that because the 2 Lederer barrels I cut today had almost perfectly shaped cutters. He pays attention to the shape of his cutter, thats obvious. The cut across the groves was as straight as I have seen. That doesnt mean they will or wont shoot, but it means he is paying attention and putting out good work. Just a plug from someone who noticed.