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
Hunting
Long Range Hunting & Shooting
switch barrel rifle build
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="MontanaRifleman" data-source="post: 482779" data-attributes="member: 11717"><p>Based om my experience with the 300 RUM, if you want seat the longer high BC bullets, you will need to lengthen the mag box unless you use the method of just putting one down so the nose is above the mag wall. What you need to do is get the brass and the bullets you want to use and seat them where you want them seated for the smith to chamber and throat the barrel to the correct depth and determine how long a box you need. You can always seat the bullet deeper into the case to shorten your COAL.</p><p></p><p>I'm guessing you'll lose about 50 fps with the 25" vs 26" barrel. Some ways to maximise your efficiency and velocity would be to..</p><p></p><p>- Use slightly faster powders like H4831sc or H1000 vs Retumbo</p><p></p><p>- Get a 5C rifled bore - there seems to be a fair amount of evidence that the 5C or 5R rifled bored are about 30 fps or so faster than non-canted rifling.</p><p></p><p>- Nitride your barrel - a fairly new process that appearrs to lengthen barrel life by 2-4x. It also give s you a little better velocity. Sources I've talked to and read show about 1-3% increase in velocity.</p><p></p><p>The 7RM has an identical base diameter as the 7RUM and the 338 RUM is .002 larger, I don't think it should be an issue but let the smith decide that.</p><p></p><p>A question for you, what experience do you have with the Gentry Quiet Brake? And just how "quiet" are they?</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 482779, member: 11717"] Based om my experience with the 300 RUM, if you want seat the longer high BC bullets, you will need to lengthen the mag box unless you use the method of just putting one down so the nose is above the mag wall. What you need to do is get the brass and the bullets you want to use and seat them where you want them seated for the smith to chamber and throat the barrel to the correct depth and determine how long a box you need. You can always seat the bullet deeper into the case to shorten your COAL. I'm guessing you'll lose about 50 fps with the 25" vs 26" barrel. Some ways to maximise your efficiency and velocity would be to.. - Use slightly faster powders like H4831sc or H1000 vs Retumbo - Get a 5C rifled bore - there seems to be a fair amount of evidence that the 5C or 5R rifled bored are about 30 fps or so faster than non-canted rifling. - Nitride your barrel - a fairly new process that appearrs to lengthen barrel life by 2-4x. It also give s you a little better velocity. Sources I've talked to and read show about 1-3% increase in velocity. The 7RM has an identical base diameter as the 7RUM and the 338 RUM is .002 larger, I don't think it should be an issue but let the smith decide that. A question for you, what experience do you have with the Gentry Quiet Brake? And just how "quiet" are they? [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Hunting
Long Range Hunting & Shooting
switch barrel rifle build
Top