22 250 ballistics help

[James Todd]

Hi all i am running a 22250 rem with a drone pro and I have just changed to factory vmax 55gr. Went out to zero new round yesterday. I was an inch high at 100yds but 2.25 high at 150yds. Looking at the balistics chart for that round it shouldn't be going there. Any ideas or is it just me being thick ?

 

[Len the dog]

Your zero is set somewhere around 240yds. The bullet is still climbing above the line of sight before dropping down to intersect the line of sight at whatever zero range is set.

 

[James Todd]

Your zero is set somewhere around 240yds. The bullet is still climbing above the line of sight before dropping down to intersect the line of sight at whatever zero range is set.

OK that doesn’t make sense though cos hornadys trajectory chart says 0.9 high at 100 is 0.0 at 200

 

[Len the dog]

I've run it through Hornady's online calculator but made assumptions on factory MV and sight height, with zero set at 300yds it gves approximately the same displacements that you are experiencing. What range are you zeroing at?

With those figures, your first zero would be at approximately 50 yds and your second zero at 300 yds.

 

[James Todd]

I've run it through Hornady's online calculator but made assumptions on factory MV and sight height, with zero set at 300yds it gves approximately the same displacements that you are experiencing. What range are you zeroing at?

With those figures, your first zero would be at approximately 50 yds and your second zero at 300 yds.

Factory MV ? ...all I did was run the online chart for vmax 55gr ...its 1 inch low at 50 ..0.9 high at 100

 

[samdk]

You will need an accurate MV for the ammunition and an accurate scope to bore height to get an accurate answer, do you have access to tools to do this?

You will also need to have a known zero range, without the above you won’t get an answer.

 

[James Todd]

You will need an accurate MV for the ammunition and an accurate scope to bore height to get an accurate answer, do you have access to tools to do this?

You will also need to have a known zero range, without the above you won’t get an answer.

I will check the above when I get chance ...not sure I will be able to get the muzzle velocity as I don't have a chrono

 

[Sakoodin1]

Just put it bang on at 100 yards because by your figures you won’t be to far away at 200 yards. Just shoot it because 200yards to 230 yards at night it a long way so don’t over think it just enjoy it. The vmax is a great bullet but I must admit I prefer the 53grn vmax to the 55 grn vmax

 

[tim@tcs]

OK that doesn’t make sense though cos hornadys trajectory chart says 0.9 high at 100 is 0.0 at 200

You may be missing the point (or I maybe misunderstand you) the zero distance is the important one! Remember that the round will rise and fall through your sights!
The zero point is where you want the crosshairs and point of impact to coincide!
Set it close and it happens on the rise and again on the fall!
The idea is that the difference in height is within a decent killing range for the target and that includes the run off in height!

 

[JTO]

Rifle Trajectory Table

As above, height of scope above bore is critical.

 

[James Todd]

You may be missing the point (or I maybe misunderstand you) the zero distance is the important one! Remember that the round will rise and fall through your sights!
The zero point is where you want the crosshairs and point of impact to coincide!
Set it close and it happens on the rise and again on the fall!
The idea is that the difference in height is within a decent killing range for the target and that includes the run off in height!

It's actually half inch low at 50yds and 0.9 high at 100 so that puts zero at 60 ish but that isn't exact. That SHOULD give me the other point of impact zero at 200 yds but it seems to be rising making the zero on fall a lot further

 

[cjs66]

With my 22/250 I find that at just under an inch at 100y it is bang on at 50 and 200y. Or near as makes no difference. This is with home loaded 50g BTs but my 55g soft points are not too far off the mark. You need a chronograph to get a proper dope chart though.

cjs

 

[Len the dog]

What barrel length? If the actual muzzle velocity is lower than what it says on the box then the trajectory will be loopier.

 

[Len the dog]

With my 22/250 I find that at just under an inch at 100y it is bang on at 50 and 200y. Or near as makes no difference. This is with home loaded 50g BTs but my 55g soft points are not too far off the mark. You need a chronograph to get a proper dope chart though.

cjs

Same here, zero my 22-250 (20") 0.75" high at 100 yds, bang on at 200yds, shoot dead centre all the way out to 240yds on fox sized target. Even switching between 50 & 55gr makes virtually no difference at 200 yds.

 

[samdk]

I will check the above when I get chance ...not sure I will be able to get the muzzle velocity as I don't have a chrono

What is your barrel length and twist rate? I have used the Hornady 55gr Varmint Express in a 1-9 & 1-14 twist 22-250 and measured the MV so I could give a reasonably accurate estimate.

 

[Bowland blades]

Hi all i am running a 22250 rem with a drone pro and I have just changed to factory vmax 55gr. Went out to zero new round yesterday. I was an inch high at 100yds but 2.25 high at 150yds. Looking at the balistics chart for that round it shouldn't be going there. Any ideas or is it just me being thick ?

Bring it down to a 100 yard exact zero, shoot the rifle at 50 yard increments from the same stance / hold ( cooling between each) . the numbers say you will be quarter inch high at 200 , dead on at 100 You will then be good regards trajectory to 250 without thinking drop and small amounts or correction from that point . Forget about all your drop dope just allow wind and no need to fek about will your around 300 on drop, just give anything wind as required then start dialing in.
Realistically there is no point in doing 100 zeros with such a rifle set it up at 200 but the numbers actually tell you that. i am just explaining it . all data should be shot not calculated till you get a way out further

 

[Utectok]

OK that doesn’t make sense though cos hornadys trajectory chart says 0.9 high at 100 is 0.0 at 200

Calculators are pretty useless unless you have good quality data and MV for that rifle and load… in fact even then you often need to true the data a little by testing it at various ranges. There are simply so many variables that affect a bullet flight it’s mind blowing. My advice is do a dead on zero at 100m then drop test to 350m or further if you can. The you will know something…

 

[Utectok]

Not that any of this is relevant at 200m but interesting anyway

 

[Utectok]

And part one

 

[Warbucks]

Hi James.
I have a Drone pro on my 22-250, this sits at 2.6" high off the bore, because the scope is higher than normal this will give a further secondary zero.
I use home loaded Nosler 50g bt's and estimate their speed to be doing around 3570 feet per second, i initially zeroed mine at 1" high at 100yds, but i was finding that shooting foxes at a typical 150 yds a lot of my shots were going too high so i lowered the Drone Pro two clicks ----or there abouts, since then iv'e been hitting most cleanly from 50yds -240 yds aiming dead on, i dont really need to shoot foxes much over this distance so cannot really comment on drop/hold over past 240 yds.
Most centre fire rifles are at their highest point in trajectory at around 150 yds, therefore IMO you dont want to be "ANY MORE" than 1" high at 150 yds because if you aim just a little bit too high or pull the shot a little high you'll be going over the top of the fox like i was.
The Drone Pro adjusts owt from 1/2"-3/4" per click so you've to adjust to the nearest click to suite, check your rifle at 150 yds and adjust to the nearest click to give you not more than 1", this is what i've got and its point-n-shoot out to 240 yds.

Dave (warbucks)