rons
Spike
Posts: 11
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Post by rons on Oct 16, 2008 17:53:22 GMT -5
I have a Parker Safari Magnum #150. It came with ther 3 dot red dot scope on it. I use Montec G5 125 grain broadheads ,and it shoots exaxtly to the POI of the red dots 20-30-40 yds. I was told by a tech at Parker to use this weight broadhead,and it would shoot right on the money using the 3 dot scope. If I go to a lighter broadhead (100 grains) will it throw of the calibration of the dots,or will it pretty much fly to the same POI? Ron
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Post by ozark on Oct 16, 2008 19:05:42 GMT -5
My guess (guess only) altering the broadhead weight would alter the point of impact. Naturally it would have a different trajectory. I think you have all you could hope for. With these crossbows I am trying to learn what to do to get consistent accuracy. Someone on this forum stated that with crossbows the balance point should be 20 percent forward of center. If I am understanding this correctly the broadhead weight should be increased or decreased to create the correct balance point. I suppose weight could be added to the nock to achieve the same purpose. If I am correctly thinking you moving to a 25 grain lighter broadhead would change the balance point toward the fletching maybe to something like 10
% forward of center. It appears that with bolts heavier broadheads are favored over light. I hope someone with the knowledge can say yea or nay to my thinking. Ozark
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Post by SW on Oct 23, 2008 6:37:29 GMT -5
X-Bow bolt act somewhat differently than arrows. They have a sping so strong that they don't flex. This allows the usage of heavier broadheads. Each 25 gr change in point wt changes speed appx 5'/sec. This has little effect on trajectory to only 40 yds. Sighting in a 100,125, and 150 g points at 20 yds and then checking the dots at 30 and 40yds will show very little change between the pts. The heavier will have steadier flight and will maintain velocity better, ie less speed loss out to 40 yds - though not a lot. This helps keep the trajectories about the same.
Now, all this written, I am shooting 100g Rages out of my 175 Parker this year, but this is a temporary situation. I'm not shooting my recurve much this year and they are what I normally use with it. Next year I plan to be shooting a broadhead specifically made for powerful x-bows.
Back to the original question: with each wt point(100,125,150) if you sight each in @ 30 yds with the middle dot, the differences in impacts of the 20 and 40 will not be detectable. I use a mil-dot rifle scope on my x-bow and do notice slight, but only slight, differences all the way out to 70 yds.
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