I started shooting 1k about 10 years ago. I started tuning at 1k almost immediately. Surprisingly the method I finally settled on was quite similar to others I had never met or spoke to before. I dont know how many thousandths of rounds I have shot tuning at 1k, but I feel if for no other reason, there are just some things learned from shooting that distance, that much, that you just cant learn other than doing it. I have returned to 100yd tuning many times and have always ended up having to make adjustments at 1k, so I just start there. Anymore, I do not shoot at any other distance. One thing I have found, and this applies to hunting rifles in my case, since I tune my br rifles for 1k, is that if the max distance I want to shoot with that rifle is mid range, I am perfectly happy to tune it at 100. I am not sure of the reason but my thoughts are the trajectory at 1k is 2.5 times that of 600 and my thinking is that the effects of that trajectory dont really start to show up until you get out there a little farther. I will never be convinced that you can shoot 1's at 1k on the regular basis they are being shot today without some help from positive compensation. Since PC is distance specific, I dont know how you could achieve the full benefit without tuning at the intended yardage. That said, I do think you can be competitive with a 100yd tune. Guys do it all the time. I just think they are leaving a little bit on the table. And before you pile on with examples of someone shooting small with a 100yd tune, I have seen the smallest 10 shot group ever shot at 1k form in the pits from a 100yd tune. There are exceptions to everything, Im basing my opinion from as wide a view across as many successful shooters as I can, not just locally. Specifically guys that agg well or win consistently with multiple barrels or rifles. I feel like Im pretty open minded, and am always learning, but this is probably the one thing that I have seen most consistent since I stated shooting 1k. If you have access to 1K, its worth at least giving it a try. Realize its different and there will be a learning curve. But once you do it a bit, you will start to understand how to read the targets and how the conditions are effecting what your doing, and you can get some very solid data, even when its not ideal weather. But like most things you will get out what you put in.