I just picked up a new GP-100 a few weeks ago and I've got a pile of Lyman 358429s cast and ready to size. I slugged the throats .. 0.3585. I have sizer dies in .358 and .359. Bullets are probably about .360 unsized so I can go either diameter.

Which would you pick, 0.358 or 0.359? Is there a fairly clear answer or should I size a couple hundred at each size and do some load testing?

Anyone who thinks there's two sides to everything hasn't met a M�bius strip.

Here be dragons ...