Some 22 cal and 6mm Projectiles sectioned.

Awesome, thanks for posting this up. I've been real curious about the 85.5. Doesn't give me a whole lot of confidence after seeing that...
 
how did you hold these bullets? They don't appear to be locked in a resin block or did you glue them down?

Did you do these cutaways in multiple passes via a mill?

It would appear Berger could redesign the 108 with a modification on their boattail and improve their BC on it but I'm not Mr. Litz either
 
how did you hold these bullets? They don't appear to be locked in a resin block or did you glue them down?

Did you do these cutaways in multiple passes via a mill?

It would appear Berger could redesign the 108 with a modification on their boattail and improve their BC on it but I'm not Mr. Litz either

Hold in soft jaw vise with half sticking out file down to close to half way. Flip hold filed side file other side down flush. Then put filed side down on sandpaper on flat surface and sand until in centrss. Bit fiddly but once you have it down takes 5 minutes or so.
 
You can also put them in a vise like you said and then use a flap disk on an angle grinder. Makes quick work of it and leaves a nice finish.
 
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