Help figuring the MOA for my POF on the way to F-CLASS

[Rockfish61]

Hello all,

I am working up new loads for my POF-308 to compete in an up-coming F-Class competition. Right now I am beating the bushes with the Sierra 155 HPBT Match. I have attached (hopefully) 3 pictures showing the results of some test loads. Two of the pictures are from 5 shot test groups and 1 is a followup of 10 shots using the same load as in test # 2. (see labels on pics). My question is: How do I figure the group MOA? My point of aim is always the center but I do not adjust as I want to see what kind of group I can get with same point of aim. These are at 300 yds.

Do you find the center of the group and measure from there? Or circle the shots closest together and measure out from there?

 

[JDGray]

Measure center to center of the farthest apart holes. Easier to measure edge to edge(same side of holes)

 

[JoeMal]

Measure center to center of the farthest apart holes. Easier to measure edge to edge(same side of holes)

This

I to be more precise, I use a program called OnTarget that allows you to input an image of your target (taken with your camera, cell phone, or scanner) and you can click on your target holes to get a calculated MOA reading. Find it here

 

[JDGray]

Of course at 300yrds, you need to divide the measurement by 3

 

[Rockfish61]

Thanks for the reply, This is what I was thinking it should be. What are your thoughts on how many shots the test group should be? I have decided to start with 5 and then move to 10 if the load looks good. Where does the gun stop and shooter start? Kind of a loaded question, I know. But the answers should be interesting.

 

[JoeMal]

Thanks for the reply, This is what I was thinking it should be. What are your thoughts on how many shots the test group should be? I have decided to start with 5 and then move to 10 if the load looks good. Where does the gun stop and shooter start? Kind of a loaded question, I know. But the answers should be interesting.

Generally, I think 5 is reasonable for a shooter to really see what the gun is capable of. 10 gets more into the realm of 'will I screw up this next shot' and your nerves start going.

Everyone has pulled that last shot in a 5 shot group...now think about if you were shooting 10 shots. The anxiety really starts to build if you've got a great group going. But for you, being an F-Class shooter, I think 10 shot groups would be appropriate to really teach yourself patience and to hone your skills

 

[Jim Watson]

For a quickie check on a load, five will get you started, ten is better data.
Of course if you are shooting an F class match, the string is 20 shots (unless you are in with the Palma guys who shoot 15) and they ALL count. The ten ring of any F class target is right at one MOA for the appropriate range. I.E. a six inch ten ring at 600 yards. They call it the "half minute target" because the X ring is .5 MOA.