How can this be?
 

How can this be? I am sighted in with 100gr broadheads but today i was going through some old gear of mine and found some 165gr simmons landsharks and decided to shoot one to see how it would fly. I must say it flew very well out of my set up. The thing that has me stumped is there is a 65 gr diffrence between what im currently shooting and the landsharks yet my 10,20 and 30 yard pins are dead on with the 165 grain heads as well? How can that be I would think that much extra weight would bring the point of impact down atleast a few inches if not more.

RE: How can this be?
 

No expert here...but it could be that the 165's are planning high from you bow not being completely tuned (not accusing you of anything, just a guess) and the weight that is pulling them down, is equal to the force from the b-head planning that it is pulling it up.

RE: How can this be?
 

That might be one explanation. Another could be what I've been saying for a long time now... People could shoot a lot more arrow weight for better penetration on game animals and not see much, if any, difference in point of impact out to 30 yards.

RE: How can this be?
 

Arthur, is that more broadhead weight or arrow weight? I really can't see any difference between 100 and 125 gr heads as far as flight. But I can see a lot of difference between a 2413 and a 2315. Seems like a 65 gr difference would alter the f.o.c. significantly.

RE: How can this be?
 

+ 65 grains in broadhead weight would definitely alter the arrow's foc significantly. It would also require a stiffer arrow spine.... unless someone was already shooting an arrow too stiff for his setup.[&:]

The likely reason you see so much difference between a 2315 and 2413 is the different arrow diameters. 2315 is only 25 grains heavier (assuming 30" arrow) and 1/64" smaller and it's stiffer spined than the 2413, but adding all the differences together... It's not the tiny bit of extra weight itself that's causing you to see any difference in POI out to 30 yards.

I've experimented with adding weight inside carbon shafts (to keep arrow spine and diameters constant, eliminating variables) and, even adding 150 extra grains, they shot to the same POI at 30 yards as the unweighted ones did. Beyond 30 yards though, that's a whole 'nuther ballgame.;) But I tested at 30 yards because most people limit themselves to that distance for hunting shots, and most others should.

RE: How can this be?
 

I would say that it is scary how we sometimes think alike Arthur. I would tend to believe this to be the case. If the arrow being shot is an exceptionally stiff spine for a given setup then even increasing point weight might not be enough to offset the spine for that setup. 65 grains does seem like alot though.

RE: How can this be?
 

Shoot the arrows out past50 yards, you will see the difference. let me know what that difference is????

RE: How can this be?
 

I was originally shooting beaman ics 400s and that was just a tad weak spined but tuned well for me. I switched to easton epic 340s a few weeks ago and there was no diffrence in tune at all. With the set up i have now the 340s are what i should be shooting according to the easton chart and shaft selector software. Cant figure it out but they shoot exactly the same. I went out to 50 and shot and there is only a tiny bit of diffrence maybe an inch if that to the point of impact. Guess this season i can shoot which ever i want.

RE: How can this be?
 

Well, I can't say about other yardages without shooting the things myself, but you ain't gonna see much difference between anything at 10 yards. That's why a ten yard pin is a a waste.

RE: How can this be?
 

yes. funny. i shot 100 gr. that i found and it shots almost dead on like my 125 i am sited in for...out past 60 yrds. though you can tell the difference...wierd....but i pull 80 lbs...so not too much difference up close