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Rifles, Reloading, Optics, Equipment
Reloading
Pressure signs/chronographing
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<blockquote data-quote=".280Rem" data-source="post: 206246" data-attributes="member: 11140"><p>It's the way my father loaded and taught me to. Between the two of us, it's worked for 40 plus years. The worst pressure problem he ever had was popping a primer or two. And I litterally mean a couple of times. Myself, I've never had to hammer a bolt open, blown a primer, etc. I have at times loaded warm loads that cratered primers, or left a little shiny mark on the case head. I backed off. </p><p> </p><p>I want to be clear here. I dont <strong>know </strong>my pressures, and never suggested that. I said that the chronograph is one tool I use to indicate where I am pressure-wise in relation to the data I'm using. I'm using the data at hand and my experience to make a best guess based on all the information.</p><p> </p><p>I have to ask how you <strong>know</strong> your max loads? Are you saying just stopped at a certain point you though safe and called it max, or are you saying you know it's a max pressure or velocity load? Do you keep adding powder until you see pressure signs then back off, or what? Or do you simply use the "max powder charge" from the book? From "miking" the casehead, checking head space, and looking at the primer? I've heard and read that "miking" can be very unreliable because you have to measure in EXACTLY the same spot each time, and most micrometers aren't THAT accurate at those 0.001 levels. But like you said, if it works for you. It is reliable IF you have the equipment and ability to do it correctly, or so I've heard and read. </p><p> </p><p>Im curious why Hodgdon would be giving data for Alliant's R-19 powder? Also, some Speer data I found online not too long ago, listed 59grs of R-19 with the 140 Grand Slam at 3040fps. I originally worked up my load from the Hornady manual listing 57.4grs of R-19 at over 3000fps as max for the 139. Also, I load the .280 over all published data because the SAAMI max is 60Kpsi because the original chambering for the .280 was in an auto loader...it can safely be loaded to .270 pressures of 65Kpsi. The .280 is the only round I'll exceed book max <strong>velocity </strong>with. If a .270 can drive a 130 at 3150, a 135 at 3050, or a 140 at 3000 with published data, there's no reason in the world I can do that at least, and slightly better actually with the .280's ever so slightly larger bore. Alliant lists a load running a 150 at 3000fps in the .270 on its website. For the .280Rem Nosler lists 57grs of R-19 at 3150 with 140s in a 26" bbl. If you look at this .270 data here: <a href="http://www.realguns.com/loads/270win.htm" target="_blank">Real Guns - Handload Data - .270 Winchester</a> there's no reason a .280 can't give similar performance with similar wt bullets, if not better. </p><p> </p><p>And like you said, it works for me. Has for a while.</p></blockquote><p></p>
[QUOTE=".280Rem, post: 206246, member: 11140"] It's the way my father loaded and taught me to. Between the two of us, it's worked for 40 plus years. The worst pressure problem he ever had was popping a primer or two. And I litterally mean a couple of times. Myself, I've never had to hammer a bolt open, blown a primer, etc. I have at times loaded warm loads that cratered primers, or left a little shiny mark on the case head. I backed off. I want to be clear here. I dont [B]know [/B]my pressures, and never suggested that. I said that the chronograph is one tool I use to indicate where I am pressure-wise in relation to the data I'm using. I'm using the data at hand and my experience to make a best guess based on all the information. I have to ask how you [B]know[/B] your max loads? Are you saying just stopped at a certain point you though safe and called it max, or are you saying you know it's a max pressure or velocity load? Do you keep adding powder until you see pressure signs then back off, or what? Or do you simply use the "max powder charge" from the book? From "miking" the casehead, checking head space, and looking at the primer? I've heard and read that "miking" can be very unreliable because you have to measure in EXACTLY the same spot each time, and most micrometers aren't THAT accurate at those 0.001 levels. But like you said, if it works for you. It is reliable IF you have the equipment and ability to do it correctly, or so I've heard and read. Im curious why Hodgdon would be giving data for Alliant's R-19 powder? Also, some Speer data I found online not too long ago, listed 59grs of R-19 with the 140 Grand Slam at 3040fps. I originally worked up my load from the Hornady manual listing 57.4grs of R-19 at over 3000fps as max for the 139. Also, I load the .280 over all published data because the SAAMI max is 60Kpsi because the original chambering for the .280 was in an auto loader...it can safely be loaded to .270 pressures of 65Kpsi. The .280 is the only round I'll exceed book max [B]velocity [/B]with. If a .270 can drive a 130 at 3150, a 135 at 3050, or a 140 at 3000 with published data, there's no reason in the world I can do that at least, and slightly better actually with the .280's ever so slightly larger bore. Alliant lists a load running a 150 at 3000fps in the .270 on its website. For the .280Rem Nosler lists 57grs of R-19 at 3150 with 140s in a 26" bbl. If you look at this .270 data here: [URL="http://www.realguns.com/loads/270win.htm"]Real Guns - Handload Data - .270 Winchester[/URL] there's no reason a .280 can't give similar performance with similar wt bullets, if not better. And like you said, it works for me. Has for a while. [/QUOTE]
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