50/70 bullets

[bruce moulds]

bob,
not all target shooters are gamers.
with regards sizing and trimming, it seems that the bisonators might have sized and the creedmoor guys mostly did not.
don is probably right about annealing and trimming. the cases did not last long enough to need it.
even using stronger powder than 1f was not recommended, as it was harder on cases.
the powdwer that seems to respond to compression most is goex. perhaps the powders of the day were more like swiss.
don,
you might be right about creedmoor shooters using factory ammo, and if they did it would have been more in the earlier days.
most of what you read is about loading their own ammo, as they had more control over paper, alloys, powder charges, etc.
by the time they were breech seating, factory ammo would have been useless.
when breech seating, there is no need to compress, just droptube.
keep safe,
bruce.