Will expandable work with my setup?

[pjridge]

Not going to comment on the penetration aspect, but IMO you might want to keep an eye on your bows mechanical structure such as limbs ect with that poundage and arrow weight combo. With the exception of one that I know of the combo will void the bows warranty. None of my business, just in case you don't know.

 

[TS_13]

Not going to comment on the penetration aspect, but IMO you might want to keep an eye on your bows mechanical structure such as limbs ect with that poundage and arrow weight combo. With the exception of one that I know of the combo will void the bows warranty. None of my business, just in case you don't know.

Please elaborate! my poundage is 60-70. Bemen suggest 400's for the draw.

 

[TNDeerGuy]

Not going to comment on the penetration aspect, but IMO you might want to keep an eye on your bows mechanical structure such as limbs ect with that poundage and arrow weight combo. With the exception of one that I know of the combo will void the bows warranty. None of my business, just in case you don't know.

Please elaborate! my poundage is 60-70. Bemen suggest 400's for the draw.

Every bow manufacturer has a minimum arrow weight because of the energy released from bow into the arrow at launch. A very light arrow, such as yours, might not have the total weight needed to absorb the energy from the bow; therfore, that unused energy will remain in the bow and could cuase cracks or other unseen damage in the bow--basically it is the samething as a partial dry-fire. Also, you could have potential damage to the arrow because it doesn't have the needed strength to handle the energy transfer from the bow, but I would be more worried about the bow. I really think you should go with a heavier arrow and solve several potential problems.

 

[pjridge]

Not going to comment on the penetration aspect, but IMO you might want to keep an eye on your bows mechanical structure such as limbs ect with that poundage and arrow weight combo. With the exception of one that I know of the combo will void the bows warranty. None of my business, just in case you don't know.

Please elaborate! my poundage is 60-70. Bemen suggest 400's for the draw.

5 grains per pound of draw weight is IBO minimum and bow companies use that as a requirement in order for their warranty to be valid and really for good reason as mentioned above. An example would be a bow set at 70# would require a 350 grain total arrow weight to have a valid warranty. You said your bow was set at 67# and shooting a 310Grain arrow. That's 4.63 grains per pound of your said draw weight. At 67# in order achieve 5 grains per pound total arrow weight you would need a total arrow weight of 335. This is total weight of the arrow, head, fletching, nock, wrap (if used) and insert. not just bare shaft. I hope I explained it ok for ya. It really can be dangerous. I personally like to shoot at least 6 gpp most of the time 7 or 8. Makes my bow quieter as well.

 

[Bowdacious]

What do you shoot??

I have a Prestige. 26" draw set at 55lbs. My arrows are right at 5.2 gpi. If he thinks yours won't open one, I know he would think mine won't.
BTW- While I was at the shop years ago, a young boy came in to check his deer. He had a 22 inch draw and was pulling 30 lbs. His mechanical opened just fine and shredded the heart.

 

[TS_13]

So here is the latest. I went and had the bow crono'd and checked. Evidently the scales i used were wrong.

64lb pull
250 f/sec

Ya'll are right about the weight of my arrows! I am close with the 64 lb pull though.