I will assume the 70A being long action will be in a .270 since they were popular.
One of the easiest, and fastest ways to trim rifle brass without dropping the bucks for a Giraud or a Dillon is a Possum Hollow Kwik Trim.
They trim from the datum, and in my experience deliver very square and precise cuts.
I run mine in a drill press, but a good friend of mine uses a drill motor with excellent results. Takes a lot of the tedium out of the process and costs a whole lot less than a powered (and most manual) trimmer.
You will need a caliber specific trimmer ($16 when I got mine about 1½ yrs ago) :
http://www.possumhollowproducts.com/kwi ... mmers.html
And the Power Adapter ($12) :
http://www.possumhollowproducts.com/power-adapter.html
The power adapter fits a range of trimmers so you only need one.
Best bang for the buck in case trimming available today in my opinion.
HTH
45Carrier