Nick — For a regular target I use recycled heavy plastic stuffed tightly into burlap coffee bean bags. Great for field points but doesn’t always stop broadheads. In order to compare penetration with broadheads, you need a uniform target substance that will stop them and which applies the same pressure to each arrow as it enters. Steertalkers Celotex setup or any good NEW dense foam target will do that (most foam 3D targets vary considerably in thickness and density from spot to spot so don’t work so well for this purpose). But as Steertalker says, foam doesn’t want to give up a broadhead and you’ll either pull heads off or really tear up the foam fast extracting arrows. So, to accurately measure relative penetration you need target that applies consistent resistance to every shot and yet releases broadheads. I don’t know of such a substance. The best I’ve been able to do is use field points that equal the weight of the broadheads I wish to test, and compare penetration that way. Granted it leaves out a vital component to penetration. Although it’s frustrating that we can’t duplicate Ashby’s tests precisely in our backyards, we still have his huge body of data to apply to our setups with predictable outcomes. For instance he has determined that in all cases, 2 blades get the best penetration on “400-pound carcases,” then 4-blades, and 3-blades last. EFOC is a major player, as is overall arrow weight and etc. We don’t have to duplicate his tests to trust that data in selecting our setups. My 2 sense, Snuffy