Increasing draw weight 18#, how much extra vel gained?

My Mission Riot bow lists, IBO rate up to 310 fps, from Mission's website.

I'm shooting a 435gr, Easton FMJ 400 arrow at an unknown velocity.

With that said, if I change the draw weight from 52#s to 70#s. How much velocity gain could one hope to get.

Kind regards,
MOBU

 

Typically those IBO's are just marketing pizazz, and only achievable at absolute optimal conditions - draw length 30+ just to name one. Unless are planning to shoot game past 40 yards (which I would not recommend unless you are a very experienced hunter and have a very confident practiced shot) FPS is means very little. With today's modern bows and broadhead's, you hit a deer in the kill zone with anything over 220 fps - that's a dead deer.

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The easiest thing to do would be to ask your local shop if they'll let you put a couple through a chrono. There are a few more numbers needed to figure out the math on what you're asking on paper but don't ask me which numbers unfortunately; I'm not good at math like that but I'm sure there are a few guys on the forum that could figure it out.

 

I think approximately 2fps/lb is average.


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Shooting off the hip I would guess your gain would be around 15-20 FPS.... Maybe move up in a couple of phases to give yourself time to adjust... So maybe move up to 60-62ish and see how your shooting, form, etc are affected and then if all goes well down the road bump it up.... No real reason to bump up your velocity though unless it's super super easy for you to pull - I've taken deer to elk to whatever anywhere from 50-60lb......

If you are wanting a flater shooting setup, going to like a BlueStreak would probably net you close to 20 FPS too.... So you could probably gain close to 30 FPS by bumping up to 62 and moving to a bluestreak or even a VAP or GT Pierce...

 

The one thing that hasn't been mentioned yet is that if you move up that much in draw weight you will also need to move up in arrow spine which will make mean a heavier arrow (a good thing) and nullify much of the speed that you gained.

Speed should be low on the priority list behind the archer's skill, broadhead selection, and arrow weight/spine.

You can get a pretty good estimate of the numbers that your bow is producing at www.archerycalculator.com