question on oal

G

Groverino

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Nova Scotia
I'm loading for an M96 Swedish mauser. How concerned should I be with pressure if seating bullets at max oal rather than what is suggested in the loading manuals? I'm working my way up slowly and have no intention of approaching max loads. It's one long throated rifle.
 
As long as you stay a few thou off the lands you should be fine, but from my experience you should stay 10-20 thou off the lands, not only because most rifles seem to shoot better, but also because tolerances being what they are, if you like to touch the lands you'll end up with a bullet stuck in the rifling sooner or later, and if you're hunting, that could ruin a good day in the bush.
And that's another issue, plenty of magazines are too short to allow you to get close to the rifling.
 
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When fire forming cases I jam the bullets hard into the rifling making firm contact, this holds the case against the bolt face and prevents case stretching in the web area. When you seat the bullet out further you are increasing internal case capacity and the chamber pressure is lower the further out you seat the bullet. With Quickload software these variables can be computed. I read about this at AccurateShooter.com and the competitive shooters do this all the time. Just work up your loads with the cartridge OAL length set as you work up your load and you will not have any problems.

Topic: Hello, quick load help?
http://forum.accurateshooter.com/index.php?topic=3756527.msg35904667#msg35904667

Topic: ? Why will Jump have higher pressure than Jam ?
http://forum.accurateshooter.com/index.php?topic=3756844.msg35906554#msg35906554

Below is an example of plotting the pressure and velocity curve in a 10 inch AR15 SBR with Quickload.

10inchar_zpse7fa9dc8.jpg
 
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