Wierdness... headstamps... loads

[Afy]

Loading 38.7 grains of N150 on a 123 Scenar...
RP brass has no issues with the load.
FC brass... bolt is sticky and falttened primers...

Sierra lists
39.9 gr of VV N150 as max with 140 SMK. Am seeing stickyish bolt with 38 gr loaded at 2.854 COAL neck sized. Maybe some flattening of primers... will take and post pics later. i.e. CET tomorrow morning.

 

[kragluver]

There are small, yet significant volume variations between brass manufactures within any given caliber. Variations in case volume = variations in peak pressure. Always start fresh and work up whenever you change a load component. Don't assume just because Load A is safe in Brand R's brass that it will be safe in Brand X's brass. Same goes with primers, bullets, etc. Note which brand of brass was used in the Sierra book.

 

[USSR]

Afy,

R-P brass has a more generous internal volume (hence lower pressure) than FC brass.

Don

 

[243winxb]

Chamber Neck Diameter

Afy- Watch your neck diameter. You said your fired case measured .295" With adding .001" to .002" for spring back of your brass, that should give you chamber neck diameter of around .296" A loaded round could measure .297" This could mean your crimping the round in the chamber, making the pressures go up. Always check you loaded rounds neck diameter. And check some more fired cases also. Most new brass is undersided in the neck area, but some times the loaded round diameter will be right on the .297" http://www.thehighroad.org/showpost.php?p=4939526&postcount=9

 

[243winxb]

BUT , i would think you have just reached your maximum loads for the components your using.

 

[Afy]

Ah well everything is on hold now. Work beckons... in the UK for the next five weeks.
No reloading... no shooting... and no silly questions from me.

At least it makes me money to pursue my obession.

I dont think I am crimping... dont have a crimp die. Only the Redding FL and NK, and now the bushing dies but no bushings.

BTW what size bushings do I get?

Also have gotten a bunch of Lapua 243 to neck up... and play with. The person I got it from was kind enough to neck up 40 cases and remove the doughnut....