QuickLoad - Land and Groove dimensions

[nfa1eab]

I have a PacNor 6mm, 4 groove, 1-8' twist, .236' bore, stainless match barrel. I wanted to enter the correct width dimensions in QuickLoad for this barrel. I called PacNor and was told that the Lands = .060', Grooves = .1330'
When I look at QuickLoad, for a 4 groove 6mm barrel, the program forces a total dimension of .1881' for land and groove.
4 x .1881' = .7524' Circumference divided by Pi = .2394' Diameter
Per PacNor, 4 x .1930' = .772' / Pi = .2457' Diameter across the grooves.
Am I missing something here, or shouldn't this dimension be .243' across the grooves and .236' across the lands for this barrel.

If the lands are measured at the .236' diameter, are they thinner when measured at the groove,.243') location?

Any help in understanding why QuickLoad forces .1881' total, which results mathematically in a .2394' dimension rather than the expected .243'?

I am a bean counter by trade, and rely on things 'Tieing Out'

Ed

 

[nfa1eab]

No ideas or thoughts from anyone?????????

 

[Travelor]

I am curious. Where in Quickload does it display the land and groove diameters for a specific number of grooves?

I have QuickLoad and am still trying to learn all it's little nuances.

Thanks,

George

 

[nfa1eab]

Once you have a cartridge loaded, say 6BR, select Data: Add,Change,Load, Save. Then select Case/Caliber Data. Then select
Change Data Records in Current File. Then press the Calc button next to Cross-Sectional Bore Area. This allows you to enter the specific dimensions for your barrel and recalculate the Cross-Sectional Bore Area. Good luck with the nuances. You'll be busier than a one legged man in a butt kickin contest!

Ed

 

[Stonewall]

Try posting that question here.
I have a HK polygone barrel .

http://www.24hourcampfire.com/ubbthreads/ubbthreads.php/ubb/postlist/Board/67

Glenn