How do you properly measure groups?

[longtines]

Do you measure from the exterior of the group, or from the center of the hole? It would seem to me that 1/2 MOA would be harder to shoot with a .30 cal as opposed to a .22 cal. I'm showing my ignorance here, but I have seen it described several ways.

[Jim Watson]

The official definition of group size is center-to-center of the two widest shots, so caliber does not affect group size.
If you are shooting in the 'one ragged hole' category, you have to start doing tricks to get a measurement, like outside to outside minus bullet diameter.

[FirstFreedom]

Technically, it's center to center. But, the best practical way to actually arrive at a center to center measurement is to measure first from *outside edge* to *outside edge* of widest two holes, THEN subtract the bullet diameter. That's what serious target shooters do.

[Jim Watson]

Yeah, you can cheat a lot off group size that way, it is hard to see the caliber size edge of a spitzer bullet hole in anything but proper crisp target paper.

Unless I am getting true one ragged hole groups, I normally measure from the inside edge of one wide shot to the outside edge of the other.

[too many choices!?]

, First freedom x2

[longtines]

Thanks for the comments. I want to be a serious shooter, so I'll be using the FF method!!!

I just bought what I consider the best off-the-rack rifle, a Rem 700 5R milspec. I have shot my first break in rounds and sighting the scope in. The last four 100 yd three shot groups were ragged holes. I was scratching my head about how to measure it.

After lunch, I'm going to move out 200 yds and see what happens.

[FatBoy]

[QUOTE]Thanks for the comments. I want to be a serious shooter, so I'll be using the FF method!!!

I just bought what I consider the best off-the-rack rifle, a Rem 700 5R milspec. I have shot my first break in rounds and sighting the scope in. The last four 100 yd three shot groups were ragged holes. I was scratching my head about how to measure it.

After lunch, I'm going to move out 200 yds and see what happensQUOTE]

Start shooting 5 shot groups

FB

[longtines]

Ok wiseguy.

I did shoot a three shot group at 200 and it measured 1" from the outside, and that would mean a .7" group, right?

I'll start five shot groups and see what happens.

[Rivers]

Sounds like a real shooter. Do post back and let us know how much tighter your five-shot groups are than are your three-shot groups.

[TPAW]

How do you properly measure groups?

LxWxH..............

[longtines]

Ok, here's a five shot group from yesterday. These are rounds #86-90 out of this rifle FGMM175's, and the fourth five shot group I have tried. This is a three inch bull, shot at 200 yds.

I think this rifle is going to be very accurate once I improve my shooting skills.

By the way, how do you find an aiming point at 200yds??? All I can see is this big black dot, and feel like I am moving all over the place.

[dolanp]

It's easy. You take the real measurements, divide by 2 or 3 (your preference) and post them on the Intar-web!