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Discussion Starter · #1 ·
I have wondered how much strain there really is on a shock leader during a cast, yes we all cast different and some use 80lb+ leader but during a cast the rod takes a bit of tension off the leader, if for instance a good caster uses 60lb leader with a 5oz lead and snaps the leader there must be over 50lb pressure to break it allowing for knot weakness, so try lifting a 56lb sack of spuds on a beach caster and see what would happen? the rod would probably snap, what are your thoughts? I'm not saying use lighter leaders just curious what the figure might be,
 

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Discussion Starter · #3 ·
I'll just get my super calculator out and see if those fancy mathematical symbols are on it lol
 

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Good question, the bigger issue is once the stretch has gone from the shock leader the additional pressure is then exerted on to the link and reel spool.

I think about the shock leader as a stress leader as during the cast there is very little shock (unless you hit the ground of course).
 

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Discussion Starter · #5 ·
I think people sometimes use far too heavy leader, maybe it's macho to say mines stronger lol, never snapped one during casting yet so must be doing something right,
 

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A "powerful" rod depends on how brutal you wish to be. A conger specialist friend can excert 35lb on a spring-balance with a zzip 2500, an Abu 9000c and 50lb mono, at 20 yards. The rod took an alarming bend, the top 3 feet ended-up just pointing towards the balance. The rod was effectively straight. To snap 80lb with a bent-at-90-degrees rod with the line pulling at 90 degrees to the butt would be an impossibility, sheer leverage would pull anyone trying it over. If however the weight was already travelling fast as the 90 degree point was reached, the weight would fly outside the tip of the rod, and it would be possible to apply considerable pressure using centrifugal force acceleratingthe lead, to the leader. The probability under this sort of pressure is thumb slip, which would lessen the pressure. Trying to get the weight to fly outside the rod tip at the beginning of the cast doesn't work, as the weight will move back inside under centripetal force. If anyone has a copy of John Holdens video made on the Dingle peninsula, his off-the-ground cast on Trabeg beach shows exactly that happening. I have a copy, but cannot copy to DVD, as the DVD player is cattled....(trucked) work it out! If anyone wants to borrow the vid to copy, they are welcome as long as I can have a copy as well!

PTR
 

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It's not 'Macho' to be safe, but it is stupid to endanger others.

Poor knots,, abrasion, poor style etc all add up to the reasons why the original 10lb for every 1oz used
 
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does anyone remember level line casting events? 200 yards on 20lb straight through.
It's called a shock leader because if your casting style is poor it will cause a sudden and massive increase in stress on the line and snap it.When I started fishing my mainline was 15lb and my leader and traces were 20lb and the only time I snapped off was when I snatched the cast, this was using 5 ounce leads.
As an experiment, get a mate to hold the end of your line and you pull the rod into as much of a bend as you can.I bet you are working harder to bend the rod than he is to hold the line.Now tie a spring balnce to the line and try again, this will let you know how much pressure is on your leader.
 

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Some info regarding force .. this is from a French Surfcasting/casting club(cant remember which one sorry)
casting 1.JPG
casting 2.JPG
casting 3.JPG
Below show the force required to cast the lead weight
casting 4.JPG
 
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