This is what you should be doing^^^^^^. I've been cooking butts at 300°-325° for about 3 years now and Mdboatbum is correct, the cooks are more predictable(about 45-55 minutes/pound) and
there is no stall. There are also no overnight and nearly sleepless cooks, no foiling, no finishing in the oven and no wife asking sarcastically if it will be done in this lifetime.
There is absolutely no reason for a new BBQer to cook butts low and slow when it so often leads to results like those experienced by rumrunner424.
What they said. My MES goes to 275 and I cook my butts at max it will go. I honestly can't tell the difference between this and one cooked at 225. Smoking should be fun and delicious. Making it frustrating defeats the purpose.