What went wrong? Opinions needed.

bounty hunter 2 said:

You are shooting an efficient cartridge with an efficient bullet so is the drop between your 200 yard zero and 450 yard target really 28 " ? 6.2 moa times 4.5 (450 yards) = 27.9" of drop according to your calculations given. Not checking any ballistic tables that seems a bit much to me.

Click to expand...

Stats for those inclined to check the ballistics: original muzzle velocity was 2875 fps with an extreme spread of 27 fps and standard deviation of 9 fps (sample of 13 shots). But, I dropped the muzzle velocity to 2750 fps to fit drops I saw at 500 and 600 yds while practicing on the Lead Sled. The 210 gr Berger Target VLD published ballistics coefficient is 0.621. Sight height is 1.7 inches. The Geovid read 55 degrees, 22.8 in HG (approx. elev 7300 ft), and -1 degree inclination. Estimates are 35% humidity and 10 mph headwind. First shot was 413 yards (Geovid suggested 5.1 MOA), later shots at 450 yards (Geovid suggested 6.2 MOA). At these distances, I think you'll find only a couple inches of difference between the two muzzle velocities.

Holler if anyone get numbers significantly different than mine.

M

trackhoehunter said:

Im gunna go about 5.3 moa off with this, but how bout a picture of the kill! Congrats as well!

Click to expand...

Both beams were broken off beyond the G4. Watched him several times throughout the week, quite the scrapper. Pretty rough on his cows, too (#CowsToo).

Yes you did. I double checked and I get 4.4 MOA @ 400 yards and 5.7 MOA at 450 yards. So alittle over 0.5 MOA difference, not enough to miss. So I go back to rechecking your zero while prone.

Or you can practice shooting sitting while slung with shooting sticks. I use my backpack as a rear bag.

Shooting sitting with sticks would be a closer position to shooting off the bench than prone

xsn10s said:

Yes you did. I double checked and I get 4.4 MOA @ 400 yards and 5.7 MOA at 450 yards. So alittle over 0.5 MOA difference, not enough to miss. So I go back to rechecking your zero while prone.

Click to expand...

You say, "yes you did"? I did what? Not following.

You must be using the 2875 fps, correct? My Geovid was set up for the 2750 fps. Regardless, that drop in velocity made little difference (not enough to miss as you stated).

Song Dogger said:

Everyone keeps saying that - pretty sure I fessed up to that early on.

Click to expand...

Yeah you've said that many times. Time for others to move on to something constructive.

Song Dogger said:

Regardless, that drop in velocity made little difference (not enough to miss as you stated).

Click to expand...

So I go back to checking your zero while prone and then shooting at distance while prone.

IMO lots of little errors here. I think they stacked on you. There is really no definitive answer.
IMO you should not have to change you velocity by 125 FPS to get your longer shots to align with you shorter shots in the Giovid's ballistic SW. That's a bit much. Starting to sound like maybe your scope does not dial correctly. Ever do a tall target test on it?

I may have missed it. What kind out chrono was used?

Steve

Song Dogger said:

I had a spotter who ranged the bull exactly as I did, and we checked multiple times - like I said, the bull was very accommodating. The load was chronographed at a temperature of 82 degrees.

Click to expand...

Don't drive yourself nuts.

If you've checked everything on your scope and rifle then just go back to the most common error of all, human error.

Toss the lead sled, do your sighting in with the same bipod you're going to shoot in the field using a good rear bag.

If you're shooting on an incline make double sure you are driving the rifle correctly and not allowing the butt to slip either up or down.

It is very natural to improperly drop the butt too low trying to get a sight picture uphill and to do the opposite when trying to sight downhill when you are on a relatively flat shooting position.

Don't beat yourself up over it, just learn from it and practice shooting from less than ideal positions and build your own knowledge base from there.

Barrelnut said:

IMO lots of little errors here. I think they stacked on you. There is really no definitive answer.
IMO you should not have to change you velocity by 125 FPS to get your longer shots to align with you shorter shots in the Giovid's ballistic SW. That's a bit much. Starting to sound like maybe your scope does not dial correctly. Ever do a tall target test on it?

Click to expand...

Just looked up tall target test. Not why I missed high, but interesting side note. I'll look into it more.

WildRose said:

Don't drive yourself nuts.

If you've checked everything on your scope and rifle then just go back to the most common error of all, human error.

Toss the lead sled, do your sighting in with the same bipod you're going to shoot in the field using a good rear bag.

If you're shooting on an incline make double sure you are driving the rifle correctly and not allowing the butt to slip either up or down.

It is very natural to improperly drop the butt too low trying to get a sight picture uphill and to do the opposite when trying to sight downhill when you are on a relatively flat shooting position.

Don't beat yourself up over it, just learn from it and practice shooting from less than ideal positions and build your own knowledge base from there.

Click to expand...

Thanks. Suggestions on a rear bag? Wondering if there's something of quality that's lightweight and packable.