Best Meplat tool I've used is the Montour County Rifle/MCR Meplat trimmer. They are much nicer built than the Tooley/Tubb units,they do cost a bit more but you get what you pay for. The MCR tool also uniforms the inside edge of the Meplat.
Here's a review:
http://www.6mmbr.com/MCRmeplat.html

Montour County Rifles
216 Shultz Road
Danville, PA 17821
or
570-437-2010
http://www.montourcountyrifles.com/
Also avaliable at MidwayUSA to

http://www.midwayusa.com/viewproduct...tnumber=587076