Measuring groups
I would like to know how to correctly measure target groups at 100 yards. I am curious to see how my shooting compares to others.
Thanks
Colin McIntosh
Thanks
Colin McIntosh
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What is the quickest and most accurate way to measure your groups? 
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MEASURE CENTER OUTSIDE HOLE TO CENTER OF OUTSIDE HOLE. GROUPS THAT SIZE FOR A .270 WOULD BE HARD TO COME BY. YOU MUST HAVE A HEAVY BARREL BENCH RIFLE AND ARE A VERY VERY GOOD SHOOTER.
I WOULD RATHER BE DUCK HUNTING.0 -
1/8" to 1/4" is awesome for any caliber, particularly a .270, for the average guy to shoot sub moa (1") groups at 100 yards with any caliber is awesome. As far as measuring groups, we have always measured center to center. In other words if you have 3 bullet holes lined up perfectly across horizontally, you would measure from the center of the far right hole to the center of the far left hole to get the measurement of the group. Our way of measuring group size may not be scientific or "by the book", it's just always been the way we've done it. Sorry not to give you a textbook answer, but that's my best stab at it. If you measure your groups with this technique and still get 1/8" groups, I have gotta guess that you're not shooting a gun "out of the box" or factory ammo.
woodyd0 -
I'm shooting a Savage 110GXP3. I replaced the stock with an older beavertail stock from a 110, pressure bedded the receiver and full barrel, replaced the trigger with the Sharp Shooter Compitition trigger factory set, and use a bipod. The ammo is reloaded Sierra 90gr. JHP, 55.0 gr. of H-380, book says: 3558 fps. I worked up this load for coyotes. I think I'm a pretty good shot. The hole just gets bigger along with my grin.
Jay0 -
Forgot, factory sporter barrel.
Jay0 -
Also, replaced the Simmons 3x9 with a new Redfield Widefield 3x9.
Jay0 -
I thought you would measure outside of hole to outside of hole and subtract the bullet diameter to locate center/s.
Rockton0 -
I am not good at math but I think if you deduct the bullet diameter aren't you making the groups smaller? Is is supposed to be center to center but how do you figure the excat center of a hole? So I measure from one edge to same edge of the two holes that are farthest apart. I think this would be the same as center to center but easier. If you deduct the bullet size it seems that would make the group smaller on paper than it it really is.
I think 1/8" groups with a sporter weight barrel would be some world class shooting. Thats a .125" group made by .277" bullets. The group would look like a slightly elongated single hole in the paper.
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That's what I have, slightly elongated holes 25%-35% of the time at 100yds. 98% of all of my groups are under 1 1/2". The groups I am measuring are the three best of five shots.
I think we are all right as far as measuring. Outside to outside minus the bullet diameter, center to center (eliminates half of the bullet diameter on each hole), or same edge (inside on one outside on the other) of two holes (eliminates the bullet diameter).
The groups I'm getting are benchrest, with a bipod, stock sporter barrel and modifications mentioned previously. This is my shoot anything gun Savage 110GXP3 .270 WIN., varmints to deer. I love Savage rifles this is one of two. The other is a Savage 99F in .300 Sav.
Thanks for the input!
Should I get into competition shooting? Anything around Milwaukee, WI?0 -
when holes are apart from one another, measure outside of the farthest hole, to the inside of the next farthest hole.
when group is one ragged hole, measure the largest part of the hole and subtract bullet diameter.
I'm a man,....but I can change,.....If I have to,......I guess.0 -
Wow. You should be entering competitions with this gun.
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