The Ranch Dog 100gr FN is an awesome little bullet. Its a tumble lube design, but I lube and size on the 450 Lyman. Nice big meplat, but feeds flawless in everything we've tried it in. He's shutting his doors and I couldnt even get on the site this morning, so good luck with this one.
The site showed that he was sold out of the .35-100-FN about 2 months ago.
The only way to get one, now, is to find a used mold (or new/second-hand). In the future, the design may be offered by Lee - but not right now.