Adjusting for draw weight vs arrow weight

[sf jakey]

I currently shoot a 75lb bow and a 482 gr arrow going about 277 for elk. I want to reduce my draw weight to 65 for extended practice and blacktail deer, but I’d like to maintain my current trajectory. How much should I be looking to reduce my arrow weight by to match the drop in draw weight? I know it’s not exact, but a general idea. Thx

 

[Bump79]

I made up this calculator just for this purpose. Personally, I'd probably try to keep my arrow shaft as close in outside diameter as possible. I would reduce down in point weight You likely will need to adjust down in spine.

Arrow Speed, KE and Momentum Calculator — The Arrow Builder

Many online arrow/bow speed calculators use an oversimplified calculation to determine arrow launch velocity. This results in inaccurate results, especially at higher grain weights. Increasing arrow mass always will lead to marginal increases in KE, meaning the bow gets more efficient as grain wei

www.thearrowbuilder.com

I'm not sure on your specs exactly but around 420 grains would keep you right around 277 fps.


You can use this side by side arrow build comparision to play around with different shaft options and front weight to get to 420 grains.

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This tool is designed to allow archers to play around with different builds and see what the difference might be. This will help create high-performance arrows tailored to your needs. Explore our tools and get a personalized quote now.

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[Mighty Mouse]

I would guess you’ll need to reduce arrow weight by 75-80 gr to maintain your current speed after dropping DW from 75# to 65#.

 

[Shooter Mike]

Generally, 2 feet per second per pound of draw weight and 3.5 feet per second per 10gr of arrow weight, IIRC.