Not sure how to answer this, I didn't buy it to shoot close. I got a semi zero at 200, and started testing at 200 and then 300 yards on a couple nice days. It grouped a certain lot of Lapua Long range rather well. I didn't have a tuner on, then one windy day I took it to 5-600 yards. Gusty full value winds from 9 o'clock, a 3-4mph gust, coupled with the spin drift generated from the barrel, made chasing a miss w/o 20 wind flags futile. We're talking feet here, like 3-4, you could make corrections, but if you failed to pick up the wind dropping, now you were 4 feet left.
9tw wasn't for me, I pulled the barrel and it is in the county landfill today. Today, I wish I had tried it in a stiff right wind, and maybe should have invested more time in the thing. Ammo was slow coming out, think 1065-1070, and I didn't want to stick more money in it cutting the barrel off, so multitude of reasons went into the decision. I sold the action too, as I had 3.
Action # 2 was at Modacam, and here it is in the same stock. 25" Mullerworks, 13tw, I am working on it and one lot of RWS R100 looks promising. Wind hasn't let up here since March 1st to make any test substantial. I'm no expert, but PM if you want my take on twist rates, I do pay attn to detail.