204 ballistic drop

[DLT]

.75 sounds more normal. My 16” 223rem only has 3moa of drop at 300yds running 70gr Barnes Hp at 2860 fps.

Is this a SIII Sightron

Thank you. It’s just a stac model

 

[RegionRat]

Just an easy question for you guys who are shooting a 204 ruger, 100yd zero what are your drops at 200 and 300 yards ? I checked my drops today and was amazed and a little bit puzzled at the same time. I’m shooting a 39gr bk at 3850. Thanks to those who chime in.

The Sierra 39 isn't part of the Applied Ballistics library, so that code doesn't have the Applied Ballistics BC values or radar tracks. However, the Sierra code would of course have this and I ran it for you. FWIW
ETA: Noticed it didn't update to your 1.75" scope height, so I re-ran and corrected it since I noticed you are really zooming down on the elevation issues.

 

[DLT]

The Sierra 39 isn't part of the Applied Ballistics library, so that code doesn't have the Applied Ballistics BC values or radar tracks. However, the Sierra code would of course have this and I ran it for you. FWIW
ETA: Noticed it didn't update to your 1.75" scope height, so I re-ran and corrected it since I noticed you are really zooming down on the elevation issues.
View attachment 1693632

Thank you for that. It’s showing a 2 minute drop to 300. Which is all over what I had shot just 3 months ago.

 

[RegionRat]

Thank you for that. It’s showing a 2 minute drop to 300. Which is all over what I had shot just 3 months ago.

No worries.

And any time you need internal/external models run, just let me know. If I'm just sitting at the keyboards, it is no problem.

I really wish Applied Ballistics ran the 39 Sierra with their Doppler and put it in their library, but for short range stuff up to about 600 yards I can get by with any published BC and bullet data and it comes out close enough till I can trim up the dope.

 

[DLT]

No worries.

And any time you need internal/external models run, just let me know. If I'm just sitting at the keyboards, it is no problem.

I really wish Applied Ballistics ran the 39 Sierra with their Doppler and put it in their library, but for short range stuff up to about 600 yards I can get by with any published BC and bullet data and it comes out close enough till I can trim up the dope.

Thank you

 

[DLT]

The Sierra 39 isn't part of the Applied Ballistics library, so that code doesn't have the Applied Ballistics BC values or radar tracks. However, the Sierra code would of course have this and I ran it for you. FWIW
ETA: Noticed it didn't update to your 1.75" scope height, so I re-ran and corrected it since I noticed you are really zooming down on the elevation issues.
View attachment 1693632

Where did you get this particular ballistic table. ?

 

[Coyotefurharvester]

RegionRats data shows the BIG difference between a true 100 yard zero with a high velocity cartridge (204R) and what most shooters see when group centers are 0.5-1.0 inches high at 100 yards.

 

[RegionRat]

Where did you get this particular ballistic table. ?

That is from the Sierra Infinity software app. It contains their BC data and runs their own ballistic solver.

 

[RegionRat]

RegionRats data shows the BIG difference between a true 100 yard zero with a high velocity cartridge (204R) and what most shooters see when group centers are 0.5-1.0 inches high at 100 yards.

Yes, the run is for the requested velocity, scope height, and I assumed at least enough twist to be stable and no cross wind, at sea level. And to your point, a true 100 yard zero.

Give me a minute and I will run the 40 VMax using the AB program for the same inputs, give it a 100 yard zero.

 

[ohlongarmisle]

No worries.

And any time you need internal/external models run, just let me know. If I'm just sitting at the keyboards, it is no problem.

I really wish Applied Ballistics ran the 39 Sierra with their Doppler and put it in their library, but for short range stuff up to about 600 yards I can get by with any published BC and bullet data and it comes out close enough till I can trim up the dope.

Forty-grain Nosler ballistic tip is one mean varmint bullet. Federal made a factory round, discontinued, luckily I bought several hundred.

 

[ohlongarmisle]

Yes, the run is for the requested velocity, scope height, and I assumed at least enough twist to be stable and no cross wind, at sea level. And to your point, a true 100 yard zero.

Give me a minute and I will run the 40 VMax using the AB program for the same inputs, give it a 100 yard zero.

View attachment 1693973

Is that the correct drop in inches at 300 yards, or am I misinterpreting something incorrectly?

 

[RegionRat]

Is that the correct drop in inches at 300 yards, or am I misinterpreting something incorrectly?

Come-up inches from 100 is different than the drop as AB shows it.

In the elevation MOA column 1.98 MOA at 300 yards.
So for a 100 yard zero then the come-up in inches at 300 yards would be 1.047x1.98 x 3 = 6.2"

 

[ohlongarmisle]

Come-up inches from 100 is different than the drop as AB shows it.

In the elevation MOA column 1.98 MOA at 300 yards.
So for a 100 yard zero then the come-up in inches at 300 yards would be 1.047x1.98 x 3 = 6.2"

THX, I knew that but the -15.336 threw me.

 

[1mil]

Over the years I found myself making things simpler. Just me, but my 5 varmint rigs including the 204...I zero 1" high at 100 yards. That means a 32 grn 204 bullet at 3950 will hit point of aim out to 250yards on a p dog. I won't dial or hold over till it's 300+. Head shooting requires some aim point adjustments esp on sage rats. Most all of my rifles are running over 3900fps ...that flat trajectory makes things easier and It's helps a bunch regarding wind drift...Time of Flight!

 

[RegionRat]

THX, I knew that but the -15.336 threw me.

It confused me the first time I ran this software too.
I don't use that column for my personal kinds of shooting, but I'm told some of the ELR folks want it that way.

 

[searcher]

I'm not getting that , i've zeroed at 50 yards and 100 yards and never missed my intended targets,but i'm listening.

I think what he meant is that the .204 shoots so flat, you might want to zero further out than one hundred yards. Even though I have great drop chart worked up for my rifles, I have mine dialed at 150. If a squirrel-sized target is as close as 50 yards, I aim for the feet, if out to 250, I aim for the top of the back - no need to even dial. Anything between 75 yards and 225 yards, just aim center mass. I only turn my dial if the squirrel is beyond 275 yards. For a coyote-sized target - even more leeway.