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
.284 Win and RL 17
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="Fitch" data-source="post: 377185" data-attributes="member: 19372"><p><span style="color: black"><span style="font-family: 'Verdana'">Input: 180 Nosler E-Tip @ 1.475" bullet length, 2.93" COL, .300WSM CIP nominal case capacity of 81.3 H2Og, 24.38" barrel, 65.5g H4350 (102.8% compressed load), normal 3625 psi start pressure.</span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">Results: 3080 fps, 68,855 psi. </span></span></p><p> </p><p><span style="color: black"><span style="font-family: 'Verdana'">I see a lot of loads in this pressure range. They are stiff but not causing bad things to happen to the brass. H4350 and IMR4350 usually model within a couple of percent in QuickLOAD if I get the bullet data, COL, and water grain capacity input correct. </span></span></p><p> </p><p></p><p></p><p> </p><p>If you would take a piece if fired, still primed, and unsized brass and weigh it on your powder scale, then fill it level full of room temperature water, weigh it again on your powder scale, subtract the two numbers and let me know that number for each piece of brass (the water grain capacity) the answers will be quite a bit more accurate in terms of pressure. I'm expecting the brass to have anywhere from 1 to 4 grains more capacity than the CIP brass volume (chambers are always a little bigger so the brass will always fit). </p><p> </p><p>I've seen quite a few RL17 loads on the internet where I could duplicate the MV, or at least get close, but the pressures QL predicted were inconsistant with the brass as read by the shooter. It may be that RL17 has a lower peak pressure and holds it longer. If that is in fact what it does, then Alliant is onto a real feature for their powders. The VV N5xx series is supposed to have the same properties - higher average pressure for the same peak pressure as the 1xx series. N570 and N560 are usuallly the powders that give the best results in cartridges like 7mmMAG, .300WM, and .338WM. I'd have to see results from pressure test equipment before I'd be ready to sign up for RL17 being that much better in terms of pressure, but it could be.</p><p> </p><p>But then according to QuickLOAD, the best easily obtainable powder for your .300WSM is IMR7828SSC. Nosler has a max load of 70g of IMR7828 in their manual for the nominal 180g category of bullets. If I use IMR7828SSC (which allows a less compressed load but burns almost the same), I get 3,049 fps at 62,563 psi. That looks like a reasonable result and is comparable to their predicted 3,037 fps.</p><p> </p><p>Fitch</p></blockquote><p></p>
[QUOTE="Fitch, post: 377185, member: 19372"] [COLOR=black][FONT=Verdana]Input: 180 Nosler E-Tip @ 1.475” bullet length, 2.93” COL, .300WSM CIP nominal case capacity of 81.3 H2Og, 24.38” barrel, 65.5g H4350 (102.8% compressed load), normal 3625 psi start pressure.[/FONT][/COLOR] [COLOR=black][FONT=Verdana] [/FONT][/COLOR] [COLOR=black][FONT=Verdana]Results: 3080 fps, 68,855 psi. [/FONT][/COLOR] [COLOR=black][FONT=Verdana][/FONT][/COLOR] [COLOR=black][FONT=Verdana]I see a lot of loads in this pressure range. They are stiff but not causing bad things to happen to the brass. H4350 and IMR4350 usually model within a couple of percent in QuickLOAD if I get the bullet data, COL, and water grain capacity input correct. [/FONT][/COLOR] If you would take a piece if fired, still primed, and unsized brass and weigh it on your powder scale, then fill it level full of room temperature water, weigh it again on your powder scale, subtract the two numbers and let me know that number for each piece of brass (the water grain capacity) the answers will be quite a bit more accurate in terms of pressure. I'm expecting the brass to have anywhere from 1 to 4 grains more capacity than the CIP brass volume (chambers are always a little bigger so the brass will always fit). I've seen quite a few RL17 loads on the internet where I could duplicate the MV, or at least get close, but the pressures QL predicted were inconsistant with the brass as read by the shooter. It may be that RL17 has a lower peak pressure and holds it longer. If that is in fact what it does, then Alliant is onto a real feature for their powders. The VV N5xx series is supposed to have the same properties - higher average pressure for the same peak pressure as the 1xx series. N570 and N560 are usuallly the powders that give the best results in cartridges like 7mmMAG, .300WM, and .338WM. I'd have to see results from pressure test equipment before I'd be ready to sign up for RL17 being that much better in terms of pressure, but it could be. But then according to QuickLOAD, the best easily obtainable powder for your .300WSM is IMR7828SSC. Nosler has a max load of 70g of IMR7828 in their manual for the nominal 180g category of bullets. If I use IMR7828SSC (which allows a less compressed load but burns almost the same), I get 3,049 fps at 62,563 psi. That looks like a reasonable result and is comparable to their predicted 3,037 fps. Fitch [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
.284 Win and RL 17
Top