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
Gunsmithing
Reamer design for 338 Norma Mag for 250gr Berger
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="J E Custom" data-source="post: 774226" data-attributes="member: 2736"><p>There are some that think that the bullet has to touch the lands to be accurate and some that don,t.</p><p></p><p>The logic behind touching the lands is sound for small cartridges like the 6mm PPC (Or most bench </p><p>rest cartridges) very few bench rest cartridges use over 50 grains of powder because they are for shorter ranges. Only the long range (1000 yard Bench rest use more) and these rifles have the same requirements as Long Range hunting has (Velocity, Ballistics and accuracy).</p><p></p><p>This type of shooting has a different set of rules than short range bench rest. Short range bench rest</p><p>bullets are normally a Flat base design, cases are loaded down for best case life and accuracy, Barrels</p><p>are normally short and heavy because velocity is not an issue. All of this is just the opposite for a long</p><p>range rifle (Long barrels, boat tail bullets with high BCs,heavy loads of powder for velocity, And yes,</p><p>Free bore to achieve high velocity without excessive pressure).</p><p></p><p>Years ago bench rest shooters had to try many rifle/ barrel and chamber combinations to get a winner.</p><p></p><p>Many of these guys became barrel makers because of poor quality barrels and chamber reamers were</p><p>not as good and most had small home type Lathes to work with., So in order to have a consistent load/</p><p>chamber combination, seating the bullet against the lands helped to center the round.</p><p></p><p>Now with good barrels,reamers,equipment and a good Smith this is not as important as it was in the</p><p>past.</p><p></p><p>I felt it necessary to bore you with the details of the different needs and my reasoning because of</p><p>the different requirements of long range hunting. </p><p></p><p>Don,t get me wrong, there is nothing wrong with seating the bullet against the lands except the velocity </p><p>and pressure issues and the ability to use many different types of bullets.</p><p></p><p>I have 4 personal rifles that I am happy with the accuracy (5 shot groups of .034, .053, .077. and</p><p> .092 and they all have free bore over .185 to .756 they can handle max loads with no heavy bolt lift</p><p>(High pressure) and the trick is a perfectly concentric chamber with little or no head space,good</p><p>load quality, great barrels and a little luck.</p><p></p><p>I hope this has not talked you out of anything, I just wanter to give you my reasons.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 774226, member: 2736"] There are some that think that the bullet has to touch the lands to be accurate and some that don,t. The logic behind touching the lands is sound for small cartridges like the 6mm PPC (Or most bench rest cartridges) very few bench rest cartridges use over 50 grains of powder because they are for shorter ranges. Only the long range (1000 yard Bench rest use more) and these rifles have the same requirements as Long Range hunting has (Velocity, Ballistics and accuracy). This type of shooting has a different set of rules than short range bench rest. Short range bench rest bullets are normally a Flat base design, cases are loaded down for best case life and accuracy, Barrels are normally short and heavy because velocity is not an issue. All of this is just the opposite for a long range rifle (Long barrels, boat tail bullets with high BCs,heavy loads of powder for velocity, And yes, Free bore to achieve high velocity without excessive pressure). Years ago bench rest shooters had to try many rifle/ barrel and chamber combinations to get a winner. Many of these guys became barrel makers because of poor quality barrels and chamber reamers were not as good and most had small home type Lathes to work with., So in order to have a consistent load/ chamber combination, seating the bullet against the lands helped to center the round. Now with good barrels,reamers,equipment and a good Smith this is not as important as it was in the past. I felt it necessary to bore you with the details of the different needs and my reasoning because of the different requirements of long range hunting. Don,t get me wrong, there is nothing wrong with seating the bullet against the lands except the velocity and pressure issues and the ability to use many different types of bullets. I have 4 personal rifles that I am happy with the accuracy (5 shot groups of .034, .053, .077. and .092 and they all have free bore over .185 to .756 they can handle max loads with no heavy bolt lift (High pressure) and the trick is a perfectly concentric chamber with little or no head space,good load quality, great barrels and a little luck. I hope this has not talked you out of anything, I just wanter to give you my reasons. J E CUSTOM [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Gunsmithing
Reamer design for 338 Norma Mag for 250gr Berger
Top