Please school the rookie

CZfool68

CZfool68

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Was out helping a buddy mount a scope and sight in his hunting rifle. Mission accomplished. He’s dialed in at 100 yards and has his drop for 200. All he needs for Bambi next Winter. Told him to NEVER let someone like Gander Mountain mount a scope again.

So I decided to shoot my Grendel a little bit. There was a decent crosswind from left to right. This was my target at 100 yards. What’s the verdict? Wind or me and my scope settings? Didn’t have time to do much more. Will get it dialed in at 200 next time, but was curious if the wind would push the bullets that much at 100 yards.

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12151791 said:
I am no expert but that consistent group on the right is something other than wind.
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Thank you. I haven’t shot that rifle in a while, and frankly I’m not that good. But it was so consistently the way the wind would have pushed it I was curious. But I was hoping at 100 the wind wouldn’t mess with me that much with a Grendel.
 
CZfool68 said:
Thank you. I haven’t shot that rifle in a while, and frankly I’m not that good. But it was so consistently the way the wind would have pushed it I was curious. But I was hoping at 100 the wind wouldn’t mess with me that much with a Grendel.
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I’m no expert, but that group looks way too tight to blame on the wind. There was wind Saturday and today, but the gusts are never as consistent as that group.
 
If the one bullet near the center was fired in dead calm conditions than, yes, the wind moved your group.
 
fieldgrade said:
I’m no expert, but that group looks way too tight to blame on the wind. There was wind Saturday and today, but the gusts are never as consistent as that group.
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Thank you. I usually shoot in the morning and it is calm. That might have been the first windy day shoot I’ve ever had. Guess I have a lot to learn.
 
OldNascar said:
If the one bullet near the center was fired in dead calm conditions than, yes, the wind moved your group.
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OP is in my neck of the woods. We don’t get consistent wind like the beach. It gusts here.
 
CZfool68 said:
Odds of that are low. It was breezy the entire time. That shot was probably user error on my part.
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I'd bet otherwise, there are always letups in any windy condition, some are very short and hardly noticeable but still there to spread things out. By the way, pretty good shooting,
 
fieldgrade said:
OP is in my neck of the woods. We don’t get consistent wind like the beach. It gusts here.
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Exactly the reason for the one bullet near zero, gusts have letups and blows thus spreading the shots in a distinct pattern.
 
CZfool68 said:
Was out helping a buddy mount a scope and sight in his hunting rifle. Mission accomplished. He’s dialed in at 100 yards and has his drop for 200. All he needs for Bambi next Winter. Told him to NEVER let someone like Gander Mountain mount a scope again.

So I decided to shoot my Grendel a little bit. There was a decent crosswind from left to right. This was my target at 100 yards. What’s the verdict? Wind or me and my scope settings? Didn’t have time to do much more. Will get it dialed in at 200 next time, but was curious if the wind would push the bullets that much at 100 yards.

View attachment 212078
Click to expand...

’d say it’s not the wind. 6.5 bullets for the most part are high bc and at 100 the effect of wind would be minimal. Just looking at the target I’d say that would take something like a 20+ mph wind to push a 140 gr eldm that far to the right at 100. My hornady 4dof calculator says my rifle would need .4 mils with a 30 mph wind coming from 270 degrees.
852dd7b9b6ba9f623d165044e2e42169.jpg



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OldNascar said:
I'd bet otherwise, there are always letups in any windy condition, some are very short and hardly noticeable but still there to spread things out. By the way, pretty good shooting,
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If the Grendel is effected by a light wind that bad at a 100 yds. I'd find another caliber.
And my second observation from that target is no that's not really all that great of a group.
 
Do you know where the first bullet impacted? What was your rate of fire? Was it slow with a lot time between shots or fast enough to heat up the barrel? It’s not the wind.


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Definitely not wind.

Tightness of the base should be checked as it's the first place to start.

Up and down could be stringers from heat, I'm assuming this is a semi-auto rifle.

What kind of ammo were you shooting? All the same loads? Same batch?

It's not a terrible group, but something could be improved upon.
 
I have on a wall in the Gun Room a chart that is entitled The Non Thinking Man's Trajectory Table. It is wonderful. It is 30 years old but I am sure you can Google it. It is wonderful. Info to free your mind about sighting in a scope.
 
If it's a hunting rifle, and the shot closest to the center was shot first from a cold barrel, you're good. As a barrel heats up it can cause your point of impact to change. When you're hunting it's that 1st shot that counts.
 
OldNascar said:
Exactly the reason for the one bullet near zero, gusts have letups and blows thus spreading the shots in a distinct pattern.
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The one nea
Grits said:
Where was the first cold bore shot on the target?

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In the big group. The flyer was about the 5-6th shot.
 
Grim said:
Definitely not wind.

Tightness of the base should be checked as it's the first place to start.

Up and down could be stringers from heat, I'm assuming this is a semi-auto rifle.

What kind of ammo were you shooting? All the same loads? Same batch?

It's not a terrible group, but something could be improved upon.
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All Hornady Black from the same box. I’ve shot better groups than that at 200 with this rifle.

CZ 527 Varmint.
 
CZfool68 said:
All Hornady Black from the same box. I’ve shot better groups than that at 200 with this rifle.

CZ 527 Varmint.
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Pick a day similar to today, no wind, same timeframe, light conditions, humidity, etc. and fire another group to compare with your current target. My money is on the wind changing the point of impact, there is no windproof bullet.
 
Grim said:
How did the bolt feel when you locked it down? Consistent each time? Tight on some, not others?
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Bolt was good. I’ll bet one problem was that I was using a little bit of a patchwork bag system. Wasn’t totally comfortable. But the group was so consistent I dismissed that. I’ll have it on the bipod with my normal rear bag next time. I’ll try to remember to update target pictures then.
 
CZfool68 said:
Was out helping a buddy mount a scope and sight in his hunting rifle. Mission accomplished. He’s dialed in at 100 yards and has his drop for 200. All he needs for Bambi next Winter. Told him to NEVER let someone like Gander Mountain mount a scope again.

So I decided to shoot my Grendel a little bit. There was a decent crosswind from left to right. This was my target at 100 yards. What’s the verdict? Wind or me and my scope settings? Didn’t have time to do much more. Will get it dialed in at 200 next time, but was curious if the wind would push the bullets that much at 100 yards.

View attachment 212078
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Absolutely not unfortunately that is shooter error. Good luck shooting next time partner
 
CZfool68 said:
Bolt was fine.
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When you plan on shooting again? I would like to see the target. Other than having a rifle in that caliber, knowing how good it is at bucking the wind at short distances, the group is approximately 3/4 an inch low. Typically with wind drift, you will see consistent evaluation impacts, compared to point of aim. And issues of impact being right or left of pointy of aim depending on the direction of the wind. Also, keep in mind we are human and have bad days on the range. I've certainly had days were my groups looked like rat dropping in a dresser drawer. Your group is not horrible and I think you will find the problem relatively easy if you stick with it.
 
Average Joe said:
When you plan on shooting again? I would like to see the target. Other than having a rifle in that caliber, knowing how good it is at bucking the wind at short distances, the group is approximately 3/4 an inch low. Typically with wind drift, you will see consistent evaluation impacts, compared to point of aim. And issues of impact being right or left of pointy of aim depending on the direction of the wind. Also, keep in mind we are human and have bad days on the range. I've certainly had days were my groups looked like rat dropping in a dresser drawer. Your group is not horrible and I think you will find the problem relatively easy if you stick with it.
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I’ll update when I get back out. Pretty sure it was me and the bags/set-up I was using. Usually use a bipod and certain rear bag. Forgot the bipod so rigged up a multiple bags to make it work. Plus hadn’t shot in too long. Might get out this weekend, but also need to install some triggers and magazine catches so who knows? Plus my daughter actually has a small low key sand v-ball t0urney. Not sure what’s up with that but may have some taxi duties. No spectators so Roy will be happy. I think.
 
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It sounds like you need an assistant! Just let me know where to pick up the rifle and ammo, I'll be happy to send a few rounds down range to help a brother out :D. I completely understand the taxi duties. While I do miss my kids, running all over God's creation every weekend not so much!
 
If the rifle (or handgun) is canted either left or right it can put the group at seven or five o'clock. Try again and be sure you aren't tipping the rifle consistently, or if that is your shooting style be sure to sight your rifle that way.
 
Am I too late to say 3 clicks L and one click U?
You need a fair amount of wind to move that round 1 minute within, and considering your groups, and the hanger, I'll 7th the "not the wind" category.

Any way about it, damn fine group for poking 4 legged edibles.
 
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Zbizzle911 said:
’d say it’s not the wind. 6.5 bullets for the most part are high bc and at 100 the effect of wind would be minimal. Just looking at the target I’d say that would take something like a 20+ mph wind to push a 140 gr eldm that far to the right at 100. My hornady 4dof calculator says my rifle would need .4 mils with a 30 mph wind coming from 270 degrees.
852dd7b9b6ba9f623d165044e2e42169.jpg



Sent from my iPhone using Tapatalk
Click to expand...

Look at this calculation and match it to your target. It's a pretty good fit. The wind can definitely push it that much at 100 yards. If your bullet, velocity, twist and caliber aren't a perfect match don't get too hung up.

And any gusting wind will open groups up a bit too.
 
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