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
Rifles, Reloading, Optics, Equipment
Reloading
Pressure signs/chronographing
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=".280Rem" data-source="post: 206062" data-attributes="member: 11140"><p>travlr47,</p><p> </p><p>Good post. So many times I post about loading, velocity, max powder charge, and pressures, and most everyone that reads it focusses on one aspect or another and loses the rest. </p><p> </p><p></p><p> </p><p>Exactly! When I write or talk about this stuff, everyone automatically assume I'm suggesting you can always load over max. I suggest you can safely load to max, so long as you choose the right powders and bullet combos. I'm suggesting that velocity is more reliable than merely saying "Well, I'm within book max loads". I've seen rifles, custom rifles usually, with tight chambers, that wouldn't take max powder charges. They did, however, shoot to max velocity, but with charges under the listed max powder charge. When you hit max velocity, you don't add powder. You can add powder until you hit max velocity, BUT max velocity is different with each powder/bullet combo. You can't safely get as high a velocity with R-7 and 165s in a 30-06 as you can with R-22. Still, if you have the data to reference you can know what your "max velocity" is with each powder. "Max velocity" I think is where some get confused. "Max velocity" varies, but if you read the data correctly, you can pretty well estimate what it is with a given powder. </p><p> </p><p>Another example of mine: Noslers top velocity load for the .280Rem is 57grs of R-19 with 140s at 3150fps. Theirs is done in a 26" bbl, so I subtract @ 50-75fps to figure my top velocity in my 24" gun. I start loading R-19 and bump it up until I hit @3075-3100. Then I stop. If it takes me 56grs or 58grs, I'm there. I don't add more if I hit 3100 at 56grs because the book says max is 57, I stop. Likewise, if I'm at 2950 when I hit 57grs, I'll add powder. Also, knowing that SAAMI max is 60k psi for the .280, and 65K for the .270, I find it's safe to load to 65Kpsi, and I can bump it up a bit more if I want. 3100-3150 with 140s is my standard load with many 139/140 bullets, using R-22, R-19, H4831. These velocities could not be obtained using faster burning powders. With H4350, my max velocity would be @3000-3050fps. Running the data through Quickload suggest that I'm running @ 62K-63K psi. And since I've loaded these loads for years with zero signs of pressure, and good brass life, I think I have a pretty good handle on velocity vs. pressure.</p></blockquote><p></p>
[QUOTE=".280Rem, post: 206062, member: 11140"] travlr47, Good post. So many times I post about loading, velocity, max powder charge, and pressures, and most everyone that reads it focusses on one aspect or another and loses the rest. Exactly! When I write or talk about this stuff, everyone automatically assume I'm suggesting you can always load over max. I suggest you can safely load to max, so long as you choose the right powders and bullet combos. I'm suggesting that velocity is more reliable than merely saying "Well, I'm within book max loads". I've seen rifles, custom rifles usually, with tight chambers, that wouldn't take max powder charges. They did, however, shoot to max velocity, but with charges under the listed max powder charge. When you hit max velocity, you don't add powder. You can add powder until you hit max velocity, BUT max velocity is different with each powder/bullet combo. You can't safely get as high a velocity with R-7 and 165s in a 30-06 as you can with R-22. Still, if you have the data to reference you can know what your "max velocity" is with each powder. "Max velocity" I think is where some get confused. "Max velocity" varies, but if you read the data correctly, you can pretty well estimate what it is with a given powder. Another example of mine: Noslers top velocity load for the .280Rem is 57grs of R-19 with 140s at 3150fps. Theirs is done in a 26" bbl, so I subtract @ 50-75fps to figure my top velocity in my 24" gun. I start loading R-19 and bump it up until I hit @3075-3100. Then I stop. If it takes me 56grs or 58grs, I'm there. I don't add more if I hit 3100 at 56grs because the book says max is 57, I stop. Likewise, if I'm at 2950 when I hit 57grs, I'll add powder. Also, knowing that SAAMI max is 60k psi for the .280, and 65K for the .270, I find it's safe to load to 65Kpsi, and I can bump it up a bit more if I want. 3100-3150 with 140s is my standard load with many 139/140 bullets, using R-22, R-19, H4831. These velocities could not be obtained using faster burning powders. With H4350, my max velocity would be @3000-3050fps. Running the data through Quickload suggest that I'm running @ 62K-63K psi. And since I've loaded these loads for years with zero signs of pressure, and good brass life, I think I have a pretty good handle on velocity vs. pressure. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Pressure signs/chronographing
Top