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
.280 AI vs .284 Winchester AI...
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="Trickymissfit" data-source="post: 450240" data-attributes="member: 25383"><p>I know I'll be staked over an anthill over this comment, but I'm also pretty thick skined!</p><p> </p><p>* in a .284 sized case there is absolutly no need ever for a 32" barrel unless you are think the muzzel being 6" closer to the target will help. You only need enough barrel length to burn the existing powder in the case, and anything more creates other problems (harmonics), and that's using 8700 powder. On the other hand you can use a slightly faster powder burn and get virtually the same velocity.</p><p> </p><p>* your testing is flawed when compairing two different guns and barrels even if they are of the same make. No two barrels shoot exactly the same. The only true test would be to cut the barrel a couple inches at a time till you reached a point in change that was significant.t would be interesting to do a case compairison between five once fired cases from each gun ( cases from the exact same lot number & die set). Just the throat alone can cause over a hundred feet per second difference.</p><p> </p><p> Secondly the shorter barrel shooting 100 fps slower could well be from the load selection or even from the actual bore in the barrel. A load built for the 24" barrel will show no real gain in a 32" barrel, and may even end up slower. Build the rounds up using AA3100 or 4350 (perhaps MagPro?), and take another look see.</p><p> </p><p>* Another major factor in accurate shooting is barrel harmonics. Kind of a black art, and often ignored way too much. In a high powered rifle you can only do so much to resolve the issue without going to a tuner. This is why heavy barrels tend to be a little more consistent and much more forgiving in our errors. Why? The rigidity of the barrel tends to fight the harmonics created by ignition, as well as the torque created by the bullet as it goes thru the barrel. The stiffer the barrel the better the groups as a rule. But there's some more to this. Lilja has stated that a typical #7 contour barrel 21" long will be 2.75 times stiffer than the same barrel 26" long (in otherwords the longer barrel is moving all over the place). It also becomes a tuning fork; thus creating bad harmonics. A 24" barrel compaired to a 32" barrel will probably be at least 2.5 times stiffer if not 4 times stiffer. </p><p> </p><p>Not be mean, but pointing out a few facts</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 450240, member: 25383"] I know I'll be staked over an anthill over this comment, but I'm also pretty thick skined! * in a .284 sized case there is absolutly no need ever for a 32" barrel unless you are think the muzzel being 6" closer to the target will help. You only need enough barrel length to burn the existing powder in the case, and anything more creates other problems (harmonics), and that's using 8700 powder. On the other hand you can use a slightly faster powder burn and get virtually the same velocity. * your testing is flawed when compairing two different guns and barrels even if they are of the same make. No two barrels shoot exactly the same. The only true test would be to cut the barrel a couple inches at a time till you reached a point in change that was significant.t would be interesting to do a case compairison between five once fired cases from each gun ( cases from the exact same lot number & die set). Just the throat alone can cause over a hundred feet per second difference. Secondly the shorter barrel shooting 100 fps slower could well be from the load selection or even from the actual bore in the barrel. A load built for the 24" barrel will show no real gain in a 32" barrel, and may even end up slower. Build the rounds up using AA3100 or 4350 (perhaps MagPro?), and take another look see. * Another major factor in accurate shooting is barrel harmonics. Kind of a black art, and often ignored way too much. In a high powered rifle you can only do so much to resolve the issue without going to a tuner. This is why heavy barrels tend to be a little more consistent and much more forgiving in our errors. Why? The rigidity of the barrel tends to fight the harmonics created by ignition, as well as the torque created by the bullet as it goes thru the barrel. The stiffer the barrel the better the groups as a rule. But there's some more to this. Lilja has stated that a typical #7 contour barrel 21" long will be 2.75 times stiffer than the same barrel 26" long (in otherwords the longer barrel is moving all over the place). It also becomes a tuning fork; thus creating bad harmonics. A 24" barrel compaired to a 32" barrel will probably be at least 2.5 times stiffer if not 4 times stiffer. Not be mean, but pointing out a few facts gary [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.280 AI vs .284 Winchester AI...
Top