I didn't spatchcock it. This massive of a turkey spatchcocked wouldn't fit on any pan I have so I just cooked it whole. I decided not to brine it: reason - 30lb turkey wouldn't fit in a 5 gal bucket - also wouldn't fit well in my yeti. Could have used a different cooler, but - I decided since the bird was injected not to do anything to it prior and just use an old recipe. This recipe (attached PDF) is how my grandparents always grill roasted their turkey back in the day. Just salt, pepper, parsley, oil, vinegar. I used a bit of lowrys with the salt for a little extra flavor. Worked well - great flavor. At the grate I had my billows at 340. Dome temp around 400. The skin on top actually broke - almost like the cap of a pork butt. I found that interesting. 30lb turkey cooked in about 3 hours. I wrapped it in foil and put it in a cooler when it was done (until I carved it to serve lunch).
It wasn't the best turkey I have ever had - this large of a turkey - some of the bird just wasn't perfectly moist - but - it certainly wasn't dry. Flavor was awesome. Dark meat was awesome. Really really good for a frozen turkey that I got for only $15.
granny_grilled_smoked_turkey_onepage.pdf