Welcome back. As you most likely already know there is a ton of great info on this forum. If you like the rifle you have set up you are going to get throat erosion and will eventually need to chase the lands. As you have already seen there are many differing opinions. If I were you and limited to 100m I would shoot a round robin ocw and post the results. The problem with a ladder at short distance is you can't tell for sure what is causing the scatter. I do believe both methods have their place. I feel the ladder yields much more useable data at longer distances. The Jason Baney article I linked to is one of the best on the subject. I also believe you will find a write up from the originator of the ocw on this forum. I am very sorry for getting caught up in taking this of topic. Good luck in your load development.