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[quote=574486]... I am like 5 grain shy of the minimum grain for my bow, which should be 350(currently about 345) I believe and I was wondering if there are any consequences if I’m shooting just a little shy of the minimum grain weight.[/quote] Yes, there are a few things to consider: -
does not cover damage caused by shooting underweight arrows. Should something happen, you are at your dealer's and Mathews' good graces, and no firm ground for complaint. -
. This has nothing to do about warranty or arrow spine, but rather your personal "comfort zone" regarding injury due to bow failure, such as broken riser or limbs. The safety 'margin' adopted by the Archery Trade Organization is on the conservative side, and based on not only peak draw weight but also cam efficiency, draw length, and Brace Height (powerstroke length), which is assumed to be 7" on this chart for a Speed Cam.
A less conservative approach to personal safety, lower brace heights, etc. requires some interpolation of this chart, but it should be done with an informed mind.
. If you shoot IBO 3-D, you would be disqualified with arrows weighing less than 5 gr/lb of peak draw weight, unless the arrows chronograph less than 280 fps. If you shoot ASA 3-D competition, you would be disqualified if the arrows chronograph faster than 280 fps + 3% (288 fps). -
. Always check arrows before shooting them. Weak spined, thin-walled shafts are more prone to cracks and failures. They should be checked rigorously and even then, accidents like this might not be avoidable ... caused lower limb splinter, cam bent, broken sight fiber optics, and the only good news was the golf-ball sized lump on my wrist went away in a week.
. Weak spined arrows, even with fixed-blade broadheads, can shoot very accurately IF one's form is extremely consistent. Unfortunately, cold weather, bad weather, awkward shooting positions, heavy camo clothing, face masks, etc. work against shot consistency. Practicing the way you will actually hunt is a good way to learn personal limitations. Getting broadheads and field points to have the same Point of Impact (POI) is unlikely with weak spined arrows, especially with fixed-blades, so it is best to just make sight settings for the type of point being shot. The more an arrow flexs when launched, the less likely different types of heads will have the same POI due to differing aerodynamic forces acting on them, and the greater flex of the arrow also occurs on impact, so a good percentage of the penetration potential is lost, especially on bone. Before hunting with lightweight arrows, I recommend they actually be tested and studied for penetration potential rather than depending on anecdotal information, like "speed kills". Weak spined arrows usually have thinner wall thickness and are more prone to fail holding the broadhead and insert in place on impact, often banana-pealing, and ruining any penetration. Also, broadhead integrity is more important with weak spined arrows because if the broadhead ferrule or blades bend causing deflection of the penetration path, the added torque on the shaft will cause it to break, usually about 3" to 4" back from the broadhead. The worst possible feeling is to watch your first successful bow shot run off with the arrow sticking out of it, only to find the broken shaft and the end of the blood trail 50 yds away and no game to recover, and days of agonizing searching and revisiting what went wrong in your mind. Thin-wall shaft and broadhead failures:
... just some food for thought, hope it helps.
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