How much do you guys think 45 grains lighter would make any difference at 30 yards.

Will I have a better cast or minimal difference.

I'm shooting 40lbs, got 445 grain and 400 grain both tune good at the short range I am able to shot today.

I like to shot 30 and 40 to practice and suffer serious trajectory after 25 yards.

Is that weight difference all in point weight, or overall shaft weight?

If you're shooting 40# at your draw length, you'll notice a difference between the shafts.  the heavier shaft will likely be an inch or two lower at 30 yards.

Ballistic calculator yields 1" more drop at 30 yards.

Same shaft easton axis 600 spine, 50 grain brass. 100 grain head gives me 400 grains. 28 3/4 long, I'm drawing 27 3/4 bow is 41 at 28.

145 grain head gives me 445, I been shooting the 145 heads, but 3 d starting I may like the flatter trajectory, I'm not a gapper and want use the same arrows I hunt with.

I was hoping the flatter trajectory might be more forgiving in instinctive shooting out to 30 yards.

Some knowledgeable folks have offered good feedback. I will only add that, in my limited experience, the added weight  being in the point alone is even more noticeable.

I shoot around 44lbs, and had real issues when I shot carbons with heavy point weight. Dropped pretty quickly past 20 yards or so.

It does not matter to science where you put the weight physics says arc and distance will be the same; but spine is affected by weight placement so it won't.          

Thanks for the ballistics calculation; 1" drop at 30 yards for 10% weight increase with that bow weight is insignificant. I use the same weight arrow for 3D and hunting to help with consistency.

It depends totally on the bow you are shooting and how fast the arrow is traveling bro.... you can take two 40 pound bows shooting 10 grains per pound
and have as much as 20-30 fps difference depending on limb design alone.

In order to answer your question we need to know how many FPS your 400 grain arrow is traveling. If its getting 180 fps @ 10 gpp and you jump up to 445 grains @ 11.125 gpp you are going to drop your velocity down to about 170 FPS or less.  The difference at 40 yards is going to be large with the same point on. i'm talking 12-18" difference.

Now if your bow is only getting 160 FPS @ 10 gpp, it's going to drop well below 150 fps @ 11.125 grains and the difference in trajectory at 40 yards will most likely be 2 feet difference or more.

QuoteOriginally posted by Keb:
 I'm not a gapper and want use the same arrows I hunt with.

i think you answered your own question.... stick with the 145g and your hand/eye/brain will figure the balistic mumbo jumbo out for you. all the while getting ready for hunting season.

that's my .02 worth.

Your looking at 4-5fps slower...

Its a 58" Toelke Whip D-10 string 10 stands, I dont have any idea on the speed.

local archery pro shop should have a chronograph you can shoot to see your arrow fps speed?  At least mine does.

I shot at 25 and some 35 tonite, no difference if any I could tell, maybe an overall lighter shaft in complete mass weight might make a difference.

They 145 actually flew better.