I bought 10K of the Wolf Magnum SR primers for the same reason. As you might already know, these are not true magnum primers, but simply primers with the hardened cups, along milspec lines. That's another avenue to explore. Here's Sierra's load data which doesn't answer the question of accuracy, but gives a range of options:
There are more variables going into this like, how long is your barrel? What's the twist rate? The ammo and reloading forum at M4carbine.net is another great source.