Distance grouping correlation ?

M

model14

Guest
From your experience, with no wind, if my .22LR 52B Sporter shoots 1/4" groups all day at 25 yards, and 1/2" groups all day at 50 yards (the Wolf MT ammo I use has a dead flat trajectory between 25 and 50 yards), should I be able to correlate this to a 1" group at 100 yards (again, no wind)? I would think so, but it ain't happening! My 100 yard groups are more like 1-1/2 to 2".
Quite frustrating, to say the least.
Thanks,
Richard

Also, what is the approximate drift displacement of a 1000 fps, 40 grain, .22LR bullet in a 10 MPH crosswind at 100 yards. I can't us my ballistic program because I don't know the BC of the bullet (Wolf MT).

Thanks again.
 
my guess is the loss of velocity at 100(well from 50 and on) is the culprit.

go look at the drop at 25, the drop at 50 and then the drop at 100......


and as everyone here will tell you , without wind flags all is a guess.


mike in co
 
4"+ at 100 yards, which means a 1 mph wind will net you .4" or so of drift.

I should probably include the windflag disclaimer-

No flags = wasting bullets.
 
no correlation

We were just shooting several accurate rifles at 50 yards and mostly making one hole groups but when we went out to 100 yards in the same condition the groups opened up to almost 2 inches. This is fairly common even with great guns and equipment and just a little imperceptible puff of wind can move you several inches at 100 yards- it's a whole different animal.
 
model14 said:
From your experience, with no wind, if my .22LR 52B Sporter shoots 1/4" groups all day at 25 yards, and 1/2" groups all day at 50 yards (the Wolf MT ammo I use has a dead flat trajectory between 25 and 50 yards), should I be able to correlate this to a 1" group at 100 yards (again, no wind)? I would think so, but it ain't happening! My 100 yard groups are more like 1-1/2 to 2".
Quite frustrating, to say the least.
Thanks,
Richard

Also, what is the approximate drift displacement of a 1000 fps, 40 grain, .22LR bullet in a 10 MPH crosswind at 100 yards. I can't us my ballistic program because I don't know the BC of the bullet (Wolf MT).

Thanks again.
Click to expand...

OK.... two thoughts.

First of all, for a blunt-nosed low BC bullet like this the accuracy absolutely does degrade exponentially with distance. If you were to make a visual representation of many shots fired, or graph your potential accuracy, you would notice that the graph for the .22LR is 'trumpet shaped' as opposed to to straight lines diverging.

And secondly, your Wolf ammo doesn't shoot "dead flat" from 25 to 50yds. It's going UP through the 25yd target and falling back DOWN through the 50.

al
 
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