I like 10k off lands, honestly this 125 grain in the bolt gun surprised me. 2.25 is my coal i loaded exactly the length from a factory hornady loaded cartridge and it just worked so I stayed with that length. Everything went together easily. The data on paper says 2400 muzzle velocity out if 16 inch barrel, I dont have a chronograph. I bought a hornady chamber gauge and will check true measurements when I receive that toolUsing single loading really opens up your options when it comes to overall length, especially if you're looking to seat your bullets a little farther out.