What he said ^^^^^
If it's an MTU and you think there's ever a slight chance of a suppressor being used, I'd keep it at 22" to 23".
I just built a .243 with a Bartlein MTU for a customer that insisted on it being cut to 20" with a Badger FTE brake. It's his coyote hunting rifle in Nevada. It went into a KRG Whiskey 3 chassis and that little rifle is surprisingly quick and handy for such a truck axle tube. It's shooting in the .1's and .2's very consistently with 115 DTAC's but I don't know what his velocity is. I'll ask him and get back to you on it.