I use 3 shot groups when sighting something in. Simple enough shoot 3 shots, find the center of those shots, measure to what you're actually aiming at/trying to hit and move the sights/crosshairs/dot/ect accordingly.
When using 3 shot groups as an indication of the accuracy of a load, it's extremely misleading.
Was out yesterday shooting cast in the 308w. Shot 4 different 10-shot groups and they were 2 1/2", 2 1/4", 2 1/4" & 2 1/8". 40 shots +/- 2 1/4" To me this is real world results and testing I can work with.
I always bring something with me to plink with between sets with the 308w letting the bbl cool. So I put a burris fastfire III on a 10" bbl'd contender that had a 3 MOA dot. Sighted it in @ 25yds with 1 of it's favorite plinking loads, Mihec's 432-640 cast with hp pins weighing +/- 265gr and 7.0gr of bullseye powder.
So I got the contender on paper and setup some targets @ the 100yd line. I use NRA 50yd smallbore targets, 3 in the top row & 2 in the bottom row. I want to get the contender dialed in so I could bang on some steel between sets with the 308w. Love the sound of steel rings!!!
Anyway the target is cluttered with bullet holes, same target stand I used the other day burning up a bunch of lee 310gr bullet. The 432-640's are the holes in the NRA targets.
I used the top 3 targets to dial the fastfire III in. Man that thing is touchy, 1 click goes a llloooooonnnnngggg way with the bullet!!!! When I felt I was close I used the bottom 2 targets for the final zero along with finalizing which brightness of the dot I wanted to use. The bright dot was fuzzy on those targets, hard to center the dot. Shot both rows of targets left to right.
The bottom left target is 3 1/2" outside to outside
The bottom right target is 1 1/2" outside to outside
I know it's only 2 targets but:
IMHO, I was shooting 3 1/2" groups with that contender. Any firearm is only as good as it's worst shot/group.
I could say I can do 1 /12" groups @ 100yds "If I do my part".
Averaging a bunch of 3 shot groups is always misleading simply because there will always be those smaller then normal groups added into the mix that doesn't reflect what is really going on.
Anyway just another opinion, not singling anyone out or anything like that. Nor is my way of doing things the only way. Myself I like a bunch of holes to sort things out. More often then not it's not so good. But this gives me something to work at/achieve. Along with getting better at identifying what is going on and how to correct issues.
When using 3 shot groups as an indication of the accuracy of a load, it's extremely misleading.
Was out yesterday shooting cast in the 308w. Shot 4 different 10-shot groups and they were 2 1/2", 2 1/4", 2 1/4" & 2 1/8". 40 shots +/- 2 1/4" To me this is real world results and testing I can work with.
I always bring something with me to plink with between sets with the 308w letting the bbl cool. So I put a burris fastfire III on a 10" bbl'd contender that had a 3 MOA dot. Sighted it in @ 25yds with 1 of it's favorite plinking loads, Mihec's 432-640 cast with hp pins weighing +/- 265gr and 7.0gr of bullseye powder.
So I got the contender on paper and setup some targets @ the 100yd line. I use NRA 50yd smallbore targets, 3 in the top row & 2 in the bottom row. I want to get the contender dialed in so I could bang on some steel between sets with the 308w. Love the sound of steel rings!!!
Anyway the target is cluttered with bullet holes, same target stand I used the other day burning up a bunch of lee 310gr bullet. The 432-640's are the holes in the NRA targets.
I used the top 3 targets to dial the fastfire III in. Man that thing is touchy, 1 click goes a llloooooonnnnngggg way with the bullet!!!! When I felt I was close I used the bottom 2 targets for the final zero along with finalizing which brightness of the dot I wanted to use. The bright dot was fuzzy on those targets, hard to center the dot. Shot both rows of targets left to right.
The bottom left target is 3 1/2" outside to outside
The bottom right target is 1 1/2" outside to outside
I know it's only 2 targets but:
IMHO, I was shooting 3 1/2" groups with that contender. Any firearm is only as good as it's worst shot/group.
I could say I can do 1 /12" groups @ 100yds "If I do my part".
Averaging a bunch of 3 shot groups is always misleading simply because there will always be those smaller then normal groups added into the mix that doesn't reflect what is really going on.
Anyway just another opinion, not singling anyone out or anything like that. Nor is my way of doing things the only way. Myself I like a bunch of holes to sort things out. More often then not it's not so good. But this gives me something to work at/achieve. Along with getting better at identifying what is going on and how to correct issues.