And the problems begin... Load Development issues

KBrun

Please take a look at Unclenick's post where he talks about the case volume being different between Federal(And LC Lake City) and winchester. Same load in those two different cases can give very different results.

Also, if you have fired steel cased ammo in your 308, I would make real sure you have cleaned the chamber very well, as the lacquer on the outside of those things can transfer to your chamber. Personally I would only use steel case ammo in two rifles, an AK or SKS. I would definitely not shoot steel case AND brass case in same shooting session.

Good luck !
 
As JD 500 suggests, varnish could be responsible for pressure and stickiness. Try shining a flashlight into the chamber to see if you can find any. Try applying Berryman B-12 Chemtool (auto parts store) to the chamber to see if it dissolves anything that comes out on a patch.

No book I have thinks your loads should be at maximum except old Sierra data, but it tends to be very conservative. It's always possible you have a "fast" barrel, but they are uncommon. Without your barrel length and some velocity measurements, that's about all I can figure out about the matter other than the earlier suggestion to be sure all copper is removed from the barrel.
 
Unclenick said:
As JD 500 suggests, varnish could be responsible for pressure and stickiness. Try shining a flashlight into the chamber to see if you can find any. Try applying Berryman B-12 Chemtool (auto parts store) to the chamber to see if it dissolves anything that comes out on a patch.

No book I have thinks your loads should be at maximum except old Sierra data, but it tends to be very conservative. It's always possible you have a "fast" barrel, but they are uncommon. Without your barrel length and some velocity measurements, that's about all I can figure out about the matter other than the earlier suggestion to be sure all copper is removed from the barrel.
Click to expand...
22" barrel, but no idea on velocity. I don't have a chrono available.
 
Pressure: First signs, an increase in the diameter of the flash hole, an increase in the diameter of the primer pocket, then there is the case head, the case head can shorten from the cup above the web to the case head.

Measure before and again after. If measurements were not made before, forget measuring after. Then there are 'more tools'.

F. Guffey
 
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