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
new build .300wm barrel legth?
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="Bart B" data-source="post: 776550" data-attributes="member: 5302"><p>I'm convinced one could go to 36 inches for any 30 caliber cartridge burning more than 70 grains of powder. I tested two .308 Win. barrel lengths, 22 inches and 32 inches, muzzle velocity went from 2800 fps to 3100 fps with the same M80 ball ammo I tested. In a 30" barrel, same load had a little over 3000 fps. All three had 4-grooves with about .3078 groove and .2990 bore diameters. The rounds had 41 grains of IMR4475 powder ('bout the same as IMR3031) under 147-gr. bullets.</p><p></p><p>I can imagine the big velocity increase from a .300 Win Mag barrel going from 24 to 30 inches with 70% more powder than a .308 Win. behind any bullet fired. There must be some reason why the 30 caliber magnums (including mine) used in 1000-yard prone matches had 28 to 30 inch barrels.</p></blockquote><p></p>
[QUOTE="Bart B, post: 776550, member: 5302"] I'm convinced one could go to 36 inches for any 30 caliber cartridge burning more than 70 grains of powder. I tested two .308 Win. barrel lengths, 22 inches and 32 inches, muzzle velocity went from 2800 fps to 3100 fps with the same M80 ball ammo I tested. In a 30" barrel, same load had a little over 3000 fps. All three had 4-grooves with about .3078 groove and .2990 bore diameters. The rounds had 41 grains of IMR4475 powder ('bout the same as IMR3031) under 147-gr. bullets. I can imagine the big velocity increase from a .300 Win Mag barrel going from 24 to 30 inches with 70% more powder than a .308 Win. behind any bullet fired. There must be some reason why the 30 caliber magnums (including mine) used in 1000-yard prone matches had 28 to 30 inch barrels. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
new build .300wm barrel legth?
Top