Thread: Substituting projectiles

Originally Posted by PipIstrelle

Sorry, I wasn't ignoring you .

I get the concept . Whenever I've set a f/l die for bump sizing , when I got close to the shoulders the cases started to lengthen . I'm gonna take a guess and say to just neck size you wouldn't be sizing to the neck shoulder juncture , so perhaps only sizing 90% of the neck .

I'll be honest , totally slipped my mind regarding the 7.62 NATO being loaded to lower pressure. My over cautious nature would still have me doing some sort of development though . But , that's me .

sorry that just doesnt make any sence at all.....
by patrial length resizing your cases arent growing in length,they are DELIBERATELY being left slightly longer/closer to the length the chamber of your rifle left them...same as neck sizing and WHY people necksize.... how can an action of squishing something down make it grow longer upwards??? other than possibly a tiny bit longer in neck itself which is what measuring case and trimming is for.....
if you really want to see partial length resizing for what it is...try a 7.62x39mm die wit ha .308 expander ball...most sets come with both sizes. we used to get a mini shoulder 70-80% of the way down the neck,where die stopped.