I am in the process of saving for a chrony but was wondering is there a program i can use that is free, that will tell me estimated velocity of a load. I have 46.5grains of varget with 150 grn nosler bt out of a 20 inch barell.
-
Having trouble using the site?
Contact support
velocity question
- Thread starter kurt
- Start date
Re: velocity question
ya i forgot to list everything. .308 with 1-12 twist. 2850 is what i figured from looks at manuals.
ya i forgot to list everything. .308 with 1-12 twist. 2850 is what i figured from looks at manuals.
Re: velocity question
Chrony is the most accurate. My books said that in 308 using 175 SMK velocity with a max load of Varget is 2690 fps. Shot some of my loads about a half grain under max over the chrony and get an average 2795 fps. Don't know if 3700 feet of elevation makes that big of a difference but something does.
Chrony is the most accurate. My books said that in 308 using 175 SMK velocity with a max load of Varget is 2690 fps. Shot some of my loads about a half grain under max over the chrony and get an average 2795 fps. Don't know if 3700 feet of elevation makes that big of a difference but something does.
Re: velocity question
Remember that older powders are more temperature sensitive. If you shoot across a chronograph in December with snow, you'll need to do it again in July as well. Some powders don't change that much. Some will change 100 fps or more. Depending on the caliber and case capacity.
Remember that older powders are more temperature sensitive. If you shoot across a chronograph in December with snow, you'll need to do it again in July as well. Some powders don't change that much. Some will change 100 fps or more. Depending on the caliber and case capacity.
Re: velocity question
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ofcrfs242</div><div class="ubbcode-body">Chrony is the most accurate. My books said that in 308 using <span style="text-decoration: underline"><span style="font-weight: bold">175 SMK </span></span>velocity with a max load of Varget is 2690 fps. Shot some of my loads about a half grain under max over the chrony and get an average 2795 fps. Don't know if 3700 feet of elevation makes that big of a difference but something does. </div></div>
I think he was asking about the 150 grains.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ofcrfs242</div><div class="ubbcode-body">Chrony is the most accurate. My books said that in 308 using <span style="text-decoration: underline"><span style="font-weight: bold">175 SMK </span></span>velocity with a max load of Varget is 2690 fps. Shot some of my loads about a half grain under max over the chrony and get an average 2795 fps. Don't know if 3700 feet of elevation makes that big of a difference but something does. </div></div>
I think he was asking about the 150 grains.
Re: velocity question
Yes I saw that in the original post. Was giving an example of the fact that what books and programs say is not necessarily correct and that the only real way to now is with a chronograph. My book was withing 150 FPS and I guess it depends on how close he would want to be on velocity.
Yes I saw that in the original post. Was giving an example of the fact that what books and programs say is not necessarily correct and that the only real way to now is with a chronograph. My book was withing 150 FPS and I guess it depends on how close he would want to be on velocity.
