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Old Pro-Line Compound Bow

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So, my brother has let me borrow his 1985 vintage ProLine Hurricane XG-1 Magnum bow for target practice out to 35 or 40 yards.
Another friend wants to borrow it also.

But he might also be in the market for buying A compound bow, and although he likes shooting this one, I'd like to be able to tell him the difference between this bow and a modern compound bow with non-circular cams and different geometry to the bow limbs.

(That's aside from all the different types of sights, arrow rests, and release triggers, because this old bow could be retrofitted with newer accessories of those types.)

When it comes to things like the percentage of draw weight that you have to hold once you've pulled back past the peak pressure point --in other words the letoff number-- how does this bow that was designed of the 1970s compare to a cutting-edge design from the last few years?

Assume the purpose is target shooting, not hunting so we won't be needing to hold the bow at full draw for long --just several seconds at most.

This old bow is said to be adjustable at 55 to 70 pounds, and I think that if my friend goes with a different bow, he would want one that could be adjusted lighter maybe 45 or 50 pounds on the low-end and 60 lbs. would be fine for the top end, peak draw weight.

This bow is made of laminated wood. Is it still safe to use after 35 years in storage?

(It was used for one season back in 1986 and that's it; it was put away and never used again until I tried some backyard practice with it a couple years ago).
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