IMHO shooting high BC bullets @ 100 yards is worthless without a chronagraph. All you really find out is how fast their going and the SD. Paper plates strung out at 50 yard incriment will give you a real good idea on how far out your good to shoot to. The first shot or two are the only ones that matter, groups are fine for a prairie dog or compettion gun but a hunting gun only has to put the cold bore shot into the plate! Takes a lot more time to get it done this way but saves a lot of powder,bullets and whare on the gun?