308 muzzle velocity

I don't load for blistering velocities anymore,I find accuracy is the finer quest.
I get a modest 2800 fps with 150 grainers out of my 7.62x51 AIA and it has plenty enough power for hunting situations and the brass lasts longer. If I want warp speeds I will load the 300 mag to the nuts and leave the little guns at home.
 
My 308 load should be around 2900 fps. I have a 26" barrel though and shoot 26 grains varget under a 155 SMK. That was the sweet spot for accuracy.

I had a hunting friend who wanted his 223 to shoot faster and faster. I told him to buy a 22-250.
 
Sorry guys this thread is not about warp speeds or super accuracy or little guns vrs big guns or who wears what to the prom tommorow night.

Its about matching my Exbal program to my rifle. Again the problem lies where i could not input negetive degrees F and had to tweek the velocity in the program to match the raw data I was getting.

Sorry don't want people getting off track and all that
 
Spydr said:
Sorry guys this thread is not about warp speeds or super accuracy or little guns vrs big guns or who wears what to the prom tommorow night.

Its about matching my Exbal program to my rifle. Again the problem lies where i could not input negetive degrees F and had to tweek the velocity in the program to match the raw data I was getting.

Sorry don't want people getting off track and all that
Click to expand...

The phone number you need to call is 1 208 476 9814
NF has a really good tech guy for program issues. You may have a hard time getting anyone however with SHOT show starting this Thursday I know most of the NF crew will be in Orlando.
 
I had a similar problem with Sierra 190's at 1000 yards. Eventually I figured out that I had failed to enter into my ballistic software that the 1000 yard targets were uphill about 5 degrees. My true velocity out of a 300 win mag is 2960 FPS, but without the angle put into the equation, the computer said my velocity was around 3100FPS!
 
Ok so I called Nightforce and they could not help me with the PALM OS but they did help me get in touch with Perry Systems I asked about this issue, which is a non issue with the pocket pc. Here is the reply I got. I also ask that if your selling this program to ensure you warn the buyer of this before making your sale as we live in Northern Canada where it is cold 8 months of the year.

[FONT='Calibri','sans-serif']Sorry I cant offer much help. The “-“ sign was omitted from the micro key pad at the bottom of the screen because of screen size issues with the Palm. In Re-guards to altitude, I don’t know of anyplace on earth where the ground level is far enough below sea level to make a difference so you can safely call it zero.[/FONT]

[FONT='Arial','sans-serif']Gerald L. Perry[/FONT]
 
Spydr said:
[FONT='Calibri','sans-serif']Sorry I cant offer much help. The “-“ sign was omitted from the micro key pad at the bottom of the screen because of screen size issues with the Palm. In Re-guards to altitude, I don’t know of anyplace on earth where the ground level is far enough below sea level to make a difference so you can safely call it zero.[/FONT]

[FONT='Arial','sans-serif']Gerald L. Perry[/FONT]
Click to expand...

OMG what an Idiot it is the Temperature not the Altitude
 
I think he is reffering to both as i asked the question as to negetive numbers in temp and altitude not working

 
So to confirm is it a Nightforce program issue or a funtion issue with the Palm Pilot not having the proper key to input the data?
 
By the time we get this figured out the coyote will be long gone, are those nightfarce scopes really that complicated. When i was younger a "palm pal" had a whole different meaning.
 
Not trying to be a smart ass cause I love tech as much as the next guy. Have not been impressed with these portable ballistic programs or units.

The idea is that you can add in all your ambient weather conditions (assuming you brought a weather station with you). Every single variable, the program engineer will let you, so you can get a 'number'.

That number is the value of scope adjustment that will allow your bullet to cruise through the air and hit your target first time every time, all the time.

Sounds good and can work pretty good for applications on our side of 1000yds. Beyond that, there are quite a few more variables that rear their ugly head.

From what I have seen punching in numbers in various programs is that ambient conditions don't really change your POI all that much. Sig. differences in altitude, humidity, air pressure, temp don't affect air all that much.

Maybe a click here and there at ranges out to 600yds when shooting a typical magnum. Try it and tell me if I have been smoking too much domestic vegetation.

What they don't account for is the unseen changes in your load and barrel harmonics. That can send you way off course.

After alot of mucking about, I found that getting a properly tuned load took care of many weather dependent variables at least shooting on my side of the planet. Shooting a barrel with a stable cold bore temprement was paramount. Alot of barrels changed POI as ambient temp changed.

Here is a good test. Put up a target with a nice bold X so aiming is easy. Take ONE cold bore shot at 200yds over different weather/seasons. See if after you have gone through one year and a bunch of weather, how that group looks like. Is it a nice sub MOA group? Or does it look like random shots on a piece of paper? Of course, being consistent in shooting helps so use any and all rests to make this as repeatable as possible.

If you have a nice cluster, congrats. If not, no computer program is going to help you.

I now have a drop table (laminated card), verified through shooting, that works pretty much dead on from winter to summer, from close to way over there. I find that is way more effective and faster then using a palm.

Plus, it doesn't need batteries and will run in the rain...Can you use the tip of a bullet to punch in data if you loose that plastic pen?

Simper Fi

Jerry
 
You must log in or register to reply here.
Back
Top Bottom