hello everyone i shoot a mathews reezen 6.5 29/70 i use easton flatline arrows with a total arrow weight of 396 grains and i am shooting at 308 fps. my question is can i benefit from changing to a 125 gr head instead of a 100 and how much speed will i lose. also will the lost speed be made up for with penetration. __________________ Joshua A Earle
make sure you have lots of KE for that head because its KE transfer to animal is a ton which means it loses lots of its energy
First: there's roughly 1 fps difference in speed for every 5 grains change in arrow weight. Add 25 grains, slow down about 5 fps. Second: Is your 308 fps IBO or chronograph? Have you actually shot an arrow through a chronograph? I shoot a Quest Smoke 29" @ 66# with a 398 grain arrow at 280 fps (IBO is 309). I think the 308 might be a little high, to be honest. Third: Kinetic energy is what you're after for penetration. That doesn't necessarily mean you need a heavier arrow. Do a google search for "arrow speed calculators" and you'll find all kinds of them. I like the ones at http://blog.stickemarchery.com. A heavy arrow, for the most part, doesn't loose as much energy down range as a lighter one but a lighter arrow is faster................... IMO...whitetail hunters shooting 40 yds or less aren't going to notice the difference between a 510 grain aluminum arrow shooting 250fps or a 398 grain carbon arrow shooting 280 fps.......that is just my opinion and we all know what that's worth.....
You will not notice any difference in penetration with 25 grains of arrow weight. If your setup is working and tuned properly I wouldn't mess with it.
Is that 308fps measured from a chrono? Also, a bit more info on your arrows would help (length, vanes wraps, inserts, etc.), because running a Flatline DOA through OT2 says you will possibly be underspined unless you have short arrows (27" or less) with wraps on the back. If your 308fps is through a chrono, then the backcountry bowhunting calculator says you'll still stay at 300fps or so. Plenty fast enough. Well, your bow starts off slower and your draw length is shorter. It's completely understandable.
that was through a chrono arrows were 30 inches but today cut them to 28.5. they have a 340 spine. i cut the arrow and went to a 110 grain head by taking the fixed blade off of the buckblaster. giving me an arrow weight of 399 grains and i am still shooting 305 chrono them again today. also using 2 inch blaser veins. at that speed with that weight i have 82.44 fpe.
that was chrono the ibo speed for this bow is 340fps so your ibo is 309 and you get 280 mine is 340 and i get 305 -308 with a similar weight arrow so it reallydoes measure up.
Your spine is correct, if you switch to a 125gr head you'll need to shoot a 300 spine arrow. You are producing way more than enough KE to blow through any animal in North America. I'd leave it the way it is...
That's cool. I'd say those numbers all make sense. It's funny though. I edited my original post to change the part where I thought your numbers made sense to I thought they were high. Always go with your first choice.......
You lose approx 1fps for every 4 to 5 grains additional weight depending on the bow. If you have good flight, and good groups I'd leave well enough alone. Dan
watch out using that buck blaster without the fixxed blades thing needs tons of energy to pass through
He should have PLENTY of energy, no worries.... Spine would be a more concerning issue. I agree, he's need a .300 spine for best flight...., and if you can get a good fixed BH to fly well out of that set-up, you'll be better off, but at least use a good fixed blade to tune it.... The speed isn't going to be enough that you'd ever notice, and if you get good flight, right spine, etc, you're gonna BLOW through just about anything in North America with that set-up.
just giving a heads up because i think that things a 2 3/4 cut (biggest on they make lol) mechanical wtih fixed blades on the side and if u take the fixxed off all it has is the mech blades which may be tough to get to pass throguh i may be thinking of a dif bh tho =[]
i agree to the broad head the buck blaster does not fly right. i am thinking maybe a montec or styker by g5 maybe slick trick
