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However, what Daiwa calls 70# test (PE5 line), PowerPro and many others would call 50# test line. I know this because last year, I tested hundreds of knots in 50# Powerpro. Every regular knot I tied in the 50# PP broke in the 30 to 35 lb. range. So that brings me to the spool I got in the mail.

The 70# PE5 Daiwa Boat Braid was in like new condition. I tied some knots and started breaking them. They all broke between 32.5 and 37.5 lbs. I have to admit, I was mildly surprised. In fact I was so sure that the line would hold 45 lb. knots that I tried that weight with the first knot and ... POP! It took 3 or 4 knots for me to believe that I wasn't doing something wrong.

Next, I tested the unknotted strength of the 70# line. I could lift 62.5 lbs. but the line broke with 65 lbs. I'd say that the Actual Breaking Strength is 64 lbs. (With many 50# lines, I have been able to lift 60 to 65 lbs. In fact, with a sample of Daiwa 55# PE4 line, I have lifted 57.5 lbs.) This particular sample of line on this particular spool, is probably undertesting a little bit.

So my advice is, consider the number on the box of line that you're buying as an ADVISORY number. It is not a number that you can take to the bank--in my case Stellwagen Bank. If you can't test the strength of the line (it can be hard to rig unknotted line for testing), tie a Uni or Surgeon's Loop knot to a swivel, wrap 10-15 turns of line around a 1" dowel, put on leather gloves and safety glasses and pull the swivel against a scale and see where the line/knot breaks--be cautious as you do this, it can be dangerous.

When you find out where your knot breaks, multiply by 1.4. That will roughly be the breaking strength of the line without knots.

Just to close the loop--for big Spinning reels I suggest that you take the initial drag you set, say 20 lbs., and multiply by 3. That is the peak drag your line will ever see as you get to the bottom of the spool (unless you wrap the line around your hand and yank). So if you start at 20 lbs. then your knots and line should be able to hold 60 lbs. or you run the risk of a break off.

BTW, I spliced 10 yards of JB 60# hollow on top of the 70# Boat Braid. The strength of the 60# JB I'm using is over 90lbs. so spliced End Loops are better than 90 lbs. and knots in it are 65 lbs. So this spool is now set for the peak drag it might see, without replacing the line.