Starting distance of jump?

[Alderman]

Is there a standard distance of bullet jump you use in an untested rifle and bullet which serves as a good starting point?
I've always just went to an OAL and used what shot decent but I would like to start doing some measuring from the ogive to see if I get any improvement.


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[HeathSexton]

Most of my stuff is limited by mag length but I typically start at .005" off but most of my stuff usually shoots best from .025" - way the hell off " the lands.

 

[DrMike]

For cup-and-core bullets, I start at 0.010 inches off the lands. For monolithic bullets, I start at 0.100 inches off the lands. For bonded core bullets, anywhere from 0.100 to 0.050 inches off the lands should yield decent accuracy.

 

[Alderman]

Is there some reason for the longer jump on the monolithic other than they shoot better with it?


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[DrMike]

Allow at least 0.050 inches due to pressure issues with the monolithics.

 

[HomerOz]

G'Day Fella's,

Alderman, what I do (if the bullet isn't being crimped etc) on most of my Hunting and Varmint rifles, is to seat any bullet from 0.020" to 0.030" off the lands!
I then start at the Start powder charge, and increase it in either 1/2 or 1 grain increments (depending on case capacity), to see what shoots the best groups!

Hope that helps

Doh!
Homer