Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Hunting
Long Range Hunting & Shooting
H-1000 velocity variation/air temp value??
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="BrentM" data-source="post: 2100955" data-attributes="member: 61747"><p>OK, to be clear, you are shooting an AR 10 and running 2.80 COAL max and want factory velocity right? What isn't stated in the charts is what cartridges are being tested. The chart is just a guide. You will have to field trial on your own, especially a gas gun. imr 4064 is listed as .53. So if you shoot 2800 at 50F, then you'll see 2790-2810. That is a 40 degree change and .53 fps/degree, 20 fps. That is 6" at 1000 yards, or .6 moa roughly. That is using a 308 with 155 berger. </p><p></p><p>What I do believe, through my own testing, is that temp stabile powders work well in wide temp swing around the temp the load was developed in. Temp sensitive powders usually shoot very well in the specific temp they are developed in but tend to go wonky when outside plus or minus 20. Velocity is just 1 component of the equation and it can usually be accounted for within reason. The other part is if the velocity changes too much you can easily be out of barrel time node and the round is now inaccurate or changes its release at the muzzle and your load is no good. For example it may be an inch high and left if it is 50 fps slower or faster. </p><p></p><p>It's just something to think about. I'd dial the load in, low sd/es, and accurate in your current environment. I'd take 10, 2 groups of 5, and put 5 in the freezer over night, and keep them on ice. I'd take 5 and put them in the house. When going to the range I'd zip lock them and put the rounds next to your body, like your chest(core). Chrono the loads and test your zero. If all is within reasonable expectations, you are good to go. </p><p></p><p>Like mentioned earlier I run RL26. I developed a load in the spring in temps 50-70. I've shot that load from -10 to 90 and never had issues hitting my targets. Velocity has changed very little. I tested it again last week at 30F and it was 3fps different over a 5 shot average. I hunt predators all winter and I've been hammering yotes from 500-1125 and don't use this feature.</p></blockquote><p></p>
[QUOTE="BrentM, post: 2100955, member: 61747"] OK, to be clear, you are shooting an AR 10 and running 2.80 COAL max and want factory velocity right? What isn't stated in the charts is what cartridges are being tested. The chart is just a guide. You will have to field trial on your own, especially a gas gun. imr 4064 is listed as .53. So if you shoot 2800 at 50F, then you'll see 2790-2810. That is a 40 degree change and .53 fps/degree, 20 fps. That is 6" at 1000 yards, or .6 moa roughly. That is using a 308 with 155 berger. What I do believe, through my own testing, is that temp stabile powders work well in wide temp swing around the temp the load was developed in. Temp sensitive powders usually shoot very well in the specific temp they are developed in but tend to go wonky when outside plus or minus 20. Velocity is just 1 component of the equation and it can usually be accounted for within reason. The other part is if the velocity changes too much you can easily be out of barrel time node and the round is now inaccurate or changes its release at the muzzle and your load is no good. For example it may be an inch high and left if it is 50 fps slower or faster. It's just something to think about. I'd dial the load in, low sd/es, and accurate in your current environment. I'd take 10, 2 groups of 5, and put 5 in the freezer over night, and keep them on ice. I'd take 5 and put them in the house. When going to the range I'd zip lock them and put the rounds next to your body, like your chest(core). Chrono the loads and test your zero. If all is within reasonable expectations, you are good to go. Like mentioned earlier I run RL26. I developed a load in the spring in temps 50-70. I've shot that load from -10 to 90 and never had issues hitting my targets. Velocity has changed very little. I tested it again last week at 30F and it was 3fps different over a 5 shot average. I hunt predators all winter and I've been hammering yotes from 500-1125 and don't use this feature. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Hunting
Long Range Hunting & Shooting
H-1000 velocity variation/air temp value??
Top