For starters i've never used a chronograph until the other day. I have what i call a good load @ 100 yrds you can cover up my three shot group with a dime. Not the best but good for me and my rifle . I shoot a 300 rum. Now that i've found what I call a good load i decided to set up the chronograph and shoot a 10 shot string. Here is what I come up with average muzzle velocity was 2964 E.S. 53.64 S.D. 16.27 from what i've read these numbers want shoot at extended range 800 to 1300 yrds will they? What do I do next?