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
Photography
Gun Photos
14 months in the making...300 RUM
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="Mike D Texas" data-source="post: 2489381" data-attributes="member: 71221"><p>According to Quickload 85 grains is way low assuming you are going to seat at 3.92". I keep forgetting how much longer the RUM case is than the Norma case. Usable powder capacity is virtually the same as the 300 NMI I'm going to build but my COAL will be 3.700 and a I have a calculated usable case capacity of 100 grains. Your setup has the same 100 grains of usable case capacity but your overall capacity is almost 5 grains more. So you are eating up powder space with the long RUM case and having to seat the bullet deeper.</p><p></p><p>Anyway QL calculates max load of 93.7 grains of Retumbo before you hit pressure for a calculated velocity of 3097fps. 101.3% case fill, 100% burn inside the barrel.</p><p></p><p>RL33 calculates 99.5 grains max load at 3170fps. 99.6% case fill, 100% burn inside the barrel.</p><p></p><p>RL50 calculates max load at 103.4 grains at 3172fps. 103.8% case fill, 100% burn inside the barrel.</p><p></p><p>N570 calculates max load at 95.0 grains at 3184fps. 97.8% case fill, 100% burn inside the barrel.</p></blockquote><p></p>
[QUOTE="Mike D Texas, post: 2489381, member: 71221"] According to Quickload 85 grains is way low assuming you are going to seat at 3.92”. I keep forgetting how much longer the RUM case is than the Norma case. Usable powder capacity is virtually the same as the 300 NMI I’m going to build but my COAL will be 3.700 and a I have a calculated usable case capacity of 100 grains. Your setup has the same 100 grains of usable case capacity but your overall capacity is almost 5 grains more. So you are eating up powder space with the long RUM case and having to seat the bullet deeper. Anyway QL calculates max load of 93.7 grains of Retumbo before you hit pressure for a calculated velocity of 3097fps. 101.3% case fill, 100% burn inside the barrel. RL33 calculates 99.5 grains max load at 3170fps. 99.6% case fill, 100% burn inside the barrel. RL50 calculates max load at 103.4 grains at 3172fps. 103.8% case fill, 100% burn inside the barrel. N570 calculates max load at 95.0 grains at 3184fps. 97.8% case fill, 100% burn inside the barrel. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Photography
Gun Photos
14 months in the making...300 RUM
Top