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
Rifles, Bullets, Barrels & Ballistics
Throat erosion and double-based powders.
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="Max Heat" data-source="post: 633549" data-attributes="member: 43153"><p>First of, the RUM can handle 25% (or 25 grains) more powder than the rem mag, thereby adding around 10% more velocity to any given bullet, resulting in 25% more "hitting power". </p><p></p><p>I suppose that most of those who do go ultra do so because they are looking for big bore size, and/or big bullet weight. But apparently I am one of those individuals who was blessed (or more likely, cursed) with the "need for speed" mentality (note my user name). I maxed out (actually, max + 1.5) on the mag at 75gr of RL-19, without my bolt going tight. Velocity at 15ft was 3680fps, + or - 5fps on 80% of the rounds fired. That probably equates to 3700 at the muzzle. Despite not having a tight bolt, I WAS very nervous firing those rounds.</p><p></p><p>The one over-charge that I did have (not sure how it happened), gave me a reading of 3875 at 15', with a very tight bolt! The amount of RL-19 that my figures indicate would have been needed to achieve that velocity, is 83gr! It must have been a really compressed load. THAT put put a scare into me, so it was at that point that I decided to chamber-up to something that can handle that much (and considerably more) of a charge, without the bolt going tight. From THAT perspective, doesn't 4000 seem reasonable for the RUM, especially since the required charge would probably still be a good 10-15gr below the max capacity (100gr) of the RUM.</p><p></p><p>And barrel burnout in only 100 rounds? Why do you think THAT low? The 220 runs similar/greater velocities. Albeit, it IS known to be a barrel burner, but with modern steel formulations, I'm thinking it should do 500-1000 rounds before accuracy goes out the window. I'm looking at the 7RUM that I'm building as the 220's "big brother".</p><p></p><p>EDIT: Just like the 220 can basically "vaporize" prairie dogs, I want to vaporize ground hogs!</p></blockquote><p></p>
[QUOTE="Max Heat, post: 633549, member: 43153"] First of, the RUM can handle 25% (or 25 grains) more powder than the rem mag, thereby adding around 10% more velocity to any given bullet, resulting in 25% more "hitting power". I suppose that most of those who do go ultra do so because they are looking for big bore size, and/or big bullet weight. But apparently I am one of those individuals who was blessed (or more likely, cursed) with the "need for speed" mentality (note my user name). I maxed out (actually, max + 1.5) on the mag at 75gr of RL-19, without my bolt going tight. Velocity at 15ft was 3680fps, + or - 5fps on 80% of the rounds fired. That probably equates to 3700 at the muzzle. Despite not having a tight bolt, I WAS very nervous firing those rounds. The one over-charge that I did have (not sure how it happened), gave me a reading of 3875 at 15', with a very tight bolt! The amount of RL-19 that my figures indicate would have been needed to achieve that velocity, is 83gr! It must have been a really compressed load. THAT put put a scare into me, so it was at that point that I decided to chamber-up to something that can handle that much (and considerably more) of a charge, without the bolt going tight. From THAT perspective, doesn't 4000 seem reasonable for the RUM, especially since the required charge would probably still be a good 10-15gr below the max capacity (100gr) of the RUM. And barrel burnout in only 100 rounds? Why do you think THAT low? The 220 runs similar/greater velocities. Albeit, it IS known to be a barrel burner, but with modern steel formulations, I'm thinking it should do 500-1000 rounds before accuracy goes out the window. I'm looking at the 7RUM that I'm building as the 220's "big brother". EDIT: Just like the 220 can basically "vaporize" prairie dogs, I want to vaporize ground hogs! [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Throat erosion and double-based powders.
Top