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Hank45
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bullet taper
Feb 15th, 2015 at 9:51am
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How much would you taper a bullet from nose to base? Thanks for your answer, Hank45
  
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Schuetzendave
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Re: bullet taper
Reply #1 - Feb 15th, 2015 at 10:04am
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Also depends on the barrel throat of your rifle; the groove-to-groove diameter; and the bore diameter.

Base band should be groove-to-groove diameter or .001 or .002 wider. The middle bands should be groove-to-groove diameter or .001 less than groove-to-groove diameter; and the front bands should be .002 less than groove-to-groove diameter or almost down  to bore diameter.
And the widest diameter of the head should be bore diameter.

However if you have a long wide throat; then you may not get a good gas seal and should not taper the bullet as much.

Tapered bullets slide into the throat farther but you have to make sure they still have a good gas seal and are not tapered too much that they start going down the barrel at an angle.


« Last Edit: Feb 15th, 2015 at 10:10am by Schuetzendave »  
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JS47
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Re: bullet taper
Reply #2 - Feb 15th, 2015 at 10:29pm
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My experience is limited so you can take it for what it's worth but what has worked very well for me is to put a 1 1/2 degree taper on the bullets using a taper die I made with a throating reamer.  I run the bullets into the taper die nose first after lubing in a lubrisizer.  I've been tapering them to the point where I can just see marks on the front edge of the base band.  It requires a knockout punch the top of which has been drilled with a 60 degree center drill.  This keeps the bullet lined up in the die.  I've had good results in both 32-20 WCF and 38-55.  Having 2 lubrisizers speeds up the process.  The 32-20 has a 1 1/2 degree throat with .100 freebore.  The 38-55 has the standard SAMMI ( I think ) throat which is pretty steep and no freebore.

JS
  
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