I splice all of the spectra on my reels to heavier spectra underneath so that i only need to change out 300 yds at a time (instead of 600+ yds). i've always used a double uni with at least 10 turns on each side and a drop of crazy glue.
i rarely target fish large enough to pull 300 yds of line off my reel, but in the cases that the splice has gone out, I've never had it fail. That being said, the heaviest that I've ever spliced in that manner is 100# power pro, so I don't know about heavier lines.
i rarely target fish large enough to pull 300 yds of line off my reel, but in the cases that the splice has gone out, I've never had it fail. That being said, the heaviest that I've ever spliced in that manner is 100# power pro, so I don't know about heavier lines.