200 yard grouping problems
First off apologies if this question should be in the handloads section, the rifle section seemed more appropriate
I have a .223 that shoots consistent sub MOA groups at 100 but I cannot seem to get dialed in at 200. The upper has a DPMS 1 in 8 20 inch barrel.
So far I have tried 55 grain SP Hornady, 68 grain Sierra and 77 grain Sierra with various loads of TAC powder. Like I said all will consistently group .5 - .75 MOA at 100 off a rest with scope but as soon as I move out to 200 it is all over the target. This even occurs on windless mornings. I do my load workups at 100 then move out to 200. I am looking for a good cost effective round for 200 yard practice shooting and if I can get 4 inch groups at 200 I will be happy.
I have a chronograph in shipping right now and a box of 75 grain A max sitting on the bench which I will try this weekend if weather permits. I guess my main is does the load differ between 100 and 200, I just cannot fathom how a load could shoot really well at 100 then go to pieces at 200 in a no wind situation or conversely shoot bad groups at 100 then pull in at 200.
Thanks in advance for any suggestions or tips.
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