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
reamers/chambering
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="elkaholic" data-source="post: 2853491" data-attributes="member: 13833"><p>Here are some reasons:</p><p>clearance in the throat use to always be .0003 to .0005" over bore size for bench rest guys, but even when it worked, it only worked at 100 yards. Pressure goes up as well as es normally and groups fall apart at longer range. I don't make ANYTHING anymore under a full thou over bore size.Attainable velocity is also greater with a little more clearance. if your ..0003" reamer gets slightly worn, you get big pressure problems in a hurry.</p><p>Neck clearance was looked at the same way by many but .003" only on the neck means higher es which equates again to long range accuracy. .005 to .006 really settles things down and I've seen even .007 or .008 work just fine.</p><p>Chamber clearance at the web of the brass will cause problems if its even .0005" too small but .001"+ over what is enough doesn't hurt a thing.</p><p>Im sure there are other examples as well, and a novice reamer designer can't possibly just take a print and cover those things without some experienced help!</p></blockquote><p></p>
[QUOTE="elkaholic, post: 2853491, member: 13833"] Here are some reasons: clearance in the throat use to always be .0003 to .0005" over bore size for bench rest guys, but even when it worked, it only worked at 100 yards. Pressure goes up as well as es normally and groups fall apart at longer range. I don't make ANYTHING anymore under a full thou over bore size.Attainable velocity is also greater with a little more clearance. if your ..0003" reamer gets slightly worn, you get big pressure problems in a hurry. Neck clearance was looked at the same way by many but .003" only on the neck means higher es which equates again to long range accuracy. .005 to .006 really settles things down and I've seen even .007 or .008 work just fine. Chamber clearance at the web of the brass will cause problems if its even .0005" too small but .001"+ over what is enough doesn't hurt a thing. Im sure there are other examples as well, and a novice reamer designer can't possibly just take a print and cover those things without some experienced help! [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
reamers/chambering
Top