Painless load development (mine)

[Moose83]

Starting with Virgin brass:

Chamfer inside/outside with cheap tool
Brush inside neck
Molly inside neck
Mandrel

Once it’s fired:
De-prime
Henderson trim everything to same length (I only do this once after the first firing, and never again)
Lube and FL size
Either wipe lube or tumble in media
Brush neck
Molly neck
Mandrel


I tried eliminating the mandrel portion, but then I just had to keep testing bushings to get the right ID of the case. It got annoying and brass OD’s vary quite a bit, especially from lot to lot. So I just use a bushing that takes them .003 under or so, and just mandrel them back open.

Which mandrel do you use and which Moly process?

 

[huntnful]

Which mandrel do you use and which Moly process?

I use 21st century mandrels and moly. Good stuff

 

[huntnful]

Testing 195 Berger’s and N570 in the 7-300 NMI. Seated maybe .015 of the lands and tested charge weights for pressure. Speeds ranged from 3077fps to 3213fps. 88gr. gave faint ejector mark and shifted POI.



After these 5 shots I could easily just load 87gr. at 3180fps and pretty much know it would shoot plenty good for any reasonable distance, and kill everything under the sun. Which is probably what I’m going to do .

 

[Harvey_NW]

Testing 195 Berger’s and N570 in the 7-300 NMI. Seated maybe .015 of the lands and tested charge weights for pressure. Speeds ranged from 3077fps to 3213fps. 88gr. gave faint ejector mark and shifted POI.

View attachment 925442

After these 5 shots I could easily just load 87gr. at 3180fps and pretty much know it would shoot plenty good for any reasonable distance, and kill everything under the sun. Which is probably what I’m going to do .

Yep, she's gonna hammer.