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theshephard · October 30, 2012, 07:21 PM

One thing is for certain - by decreasing your COAL, your increasing the 'jump' or distance between the bullet ogive and the lands of the barrel's rifling.

It's a pretty common belief that by dialing in the OAL (not COAL) to minimize jump, you'll see better accuracy. This may explain why, as you seat the bullet farther out of the case, you're seeing better or at least more consistent accuracy.

Hornady themselves even make a tool to help you with this, called the Lock n Load OAL Gauge.
You can read more about this here:
http://www.6mmbr.com/catalog/item/1433308/977259.htm

For the record, some people dispute this as superstition so YMMV, but as the prior poster alluded - you can only find out by experimenting, keeping records, and evaluating the data yourself.

October 30, 2012, 07:21 PM	#3
theshephard Member Join Date: October 1, 2010 Location: Anchorage, Alaska Posts: 26	Distance to lands?? One thing is for certain - by decreasing your COAL, your increasing the 'jump' or distance between the bullet ogive and the lands of the barrel's rifling. It's a pretty common belief that by dialing in the OAL (not COAL) to minimize jump, you'll see better accuracy. This may explain why, as you seat the bullet farther out of the case, you're seeing better or at least more consistent accuracy. Hornady themselves even make a tool to help you with this, called the Lock n Load OAL Gauge. You can read more about this here: http://www.6mmbr.com/catalog/item/1433308/977259.htm For the record, some people dispute this as superstition so YMMV, but as the prior poster alluded - you can only find out by experimenting, keeping records, and evaluating the data yourself.