I like a 7/16” x 80’ main line with a Factor 55 Splicer thimble and a 1/2” x 50’ extension. The short main line and extension combo is much more versatile and easier to work with versus one long main line.
My current rope is Diamond line from Custom Splice. They’re an inexpensive source for finished ropes, lots of length and diameter options. They’re a small shop and things are commonly out of stock, and order fulfillment and communication can be slow. For example, right now they’re probably out at King of the Hammers and won’t be shipping orders till they get back.
Really any brand will do, the off-brand ropes are probably all coming out of the same handful of Chinese factories, but Custom Splice does the work for you and makes it very easy to get the size and length you need with quality finishing items. The really cheap Amazon/eBay ropes come with throw-away finishing items. I wouldn’t touch the hook that comes with an $80 3/8” Amazon rope except to throw it in the trash.
If you’re going to use synthetic rope, you should get splicing tools and know how to use them. One of the big advantages of synthetic is that it is repairable, but if you don’t have the tools and know-how, that does you no good. My splice kit is a Factor 55 fast fid, $10 ceramic paring knife, permanent marker, electrical tape, a small scrap of plastic cutting board and some waxed whipping twine.
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