how I find the lands in chambers

okie2 · October 28, 2009, 05:28 PM

Split 2 sides of sized case neck insert bullet of your choice just enough to hold it then chamber it
remove carefully and measure as picture. this will give you the most accurate measurment you can get. THEN SET SEATING DIE TO THIS LENGTH.
the lands will push bullet back into case.

Tex S · October 28, 2009, 05:38 PM

I just use the Hornady setup. It works good... with it you dont have to worry about pushing the bullet further into the case.

**Unclenick** · October 28, 2009, 05:50 PM

That's a nice illustration. Most people don't load with the bullet touching the throat, though. It is popular with some shooters, but because it raises a normal charge's pressure by typically 10,000 psi or so, you have to reduce the powder charge and work up slowly from a lower level than was found good with the bullet a little deeper into the case. A number of benchrest shooters have found that while seating out to touch the lands produces decent accuracy, it gets even better when they set the bullet a little deeper. How much deeper depends on the individual gun?

In the image below, which I linked to from RSI's web site, the three upper pressure traces are for a light 6 ppc load seated so the bullet is touching the lands, while the last four are for the same load, but with the bullets seated 0.030" short of the lands. If the bullet was seated a bit deeper, it would have gone down still futher, up to a point. After that it would begin to climbe again because of the space lost in the case when the bullet is seated deeper.

October 28, 2009, 05:28 PM	#1
okie2 Member Join Date: March 8, 2009 Location: terlton, oklahoma Posts: 93	how I find the lands in chambers Split 2 sides of sized case neck insert bullet of your choice just enough to hold it then chamber it remove carefully and measure as picture. this will give you the most accurate measurment you can get. THEN SET SEATING DIE TO THIS LENGTH. the lands will push bullet back into case.

October 28, 2009, 05:50 PM	#3
Unclenick Staff Join Date: March 4, 2005 Location: Ohio Posts: 21,061	That's a nice illustration. Most people don't load with the bullet touching the throat, though. It is popular with some shooters, but because it raises a normal charge's pressure by typically 10,000 psi or so, you have to reduce the powder charge and work up slowly from a lower level than was found good with the bullet a little deeper into the case. A number of benchrest shooters have found that while seating out to touch the lands produces decent accuracy, it gets even better when they set the bullet a little deeper. How much deeper depends on the individual gun? In the image below, which I linked to from RSI's web site, the three upper pressure traces are for a light 6 ppc load seated so the bullet is touching the lands, while the last four are for the same load, but with the bullets seated 0.030" short of the lands. If the bullet was seated a bit deeper, it would have gone down still futher, up to a point. After that it would begin to climbe again because of the space lost in the case when the bullet is seated deeper. __________________ Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle

October 28, 2009, 05:38 PM	#2
Tex S Senior Member Join Date: November 12, 2008 Location: Fort Worth, TEXAS Posts: 909	I just use the Hornady setup. It works good... with it you dont have to worry about pushing the bullet further into the case.