Re: 2 dumb questions
Here is something from Chuck Hawks site about that.
When loading .280 ammunition for use in pump action or autoloading rifles it is best to stick with the lighter loads. This is not for reasons of safety, but because these actions lack the camming power to extract stuck cases. It is also a good idea to full length resize cases that will be used in these actions. Maximum loads are intended for use in bolt action rifles.
Some basic .280 specifications useful to reloaders are these: Bullet diameter .284", Maximum COL 3.33", Maximum case length 2.54", MAP 60,000 psi
This is from Petersons rifleshooter magazine
Remington made a mistake by developing the .280 for use in the semiauto Model 740 because it had to be loaded to pressure levels below those used for the .270 Win., which was designed strictly for bolt guns. Once that decision had been made and there were rifles and ammo in the hands of consumers, there was no turning back.
This is where I am getting this information from.