Here is an interesting scenario I have been wrestling with.
I currently own and shoot Easton Axis 260s with 75gr brass inserts and 100gr heads cut @29.5 Finished arrow weight is 540gr. and I have chronographed them at 278fps. They work out to a 14.46% FOC with 0.6651 momentum via OT2. Nothing to sneeze at.
I have been tinkering with other arrows and started looking at the Black Eagle Spartans in 250 spine. I'm guessing I can get an arrow to finish in the 515-520gr range with the 75gr brass screw in weights cut at 29" and push them a little quicker based on OT2 at around 283fps. Works out to a higher 17.65% FOC but lower momentum of 0.6510.
Other alternative is only using one 30gr. brass screw in insert weight on the Spartans @29" with a finished arrow weight around 473gr which keeps my FOC around my Easton's at 14.64% but flattens the trajectory out a bit at 296fps.
The bow will be used mainly for hunting out West for animals ranging in size from deer to elk and ranges from 0-70yds. Bow specs are 70lb Mathews Halon 5 @70/29" w/75% LO. All weights are assuming 100gr tips.
So which would you choose? Mass with highest momentum? Highest FOC with lower momentum? Sacrifice FOC and momentum for trajectory?
I currently own and shoot Easton Axis 260s with 75gr brass inserts and 100gr heads cut @29.5 Finished arrow weight is 540gr. and I have chronographed them at 278fps. They work out to a 14.46% FOC with 0.6651 momentum via OT2. Nothing to sneeze at.
I have been tinkering with other arrows and started looking at the Black Eagle Spartans in 250 spine. I'm guessing I can get an arrow to finish in the 515-520gr range with the 75gr brass screw in weights cut at 29" and push them a little quicker based on OT2 at around 283fps. Works out to a higher 17.65% FOC but lower momentum of 0.6510.
Other alternative is only using one 30gr. brass screw in insert weight on the Spartans @29" with a finished arrow weight around 473gr which keeps my FOC around my Easton's at 14.64% but flattens the trajectory out a bit at 296fps.
The bow will be used mainly for hunting out West for animals ranging in size from deer to elk and ranges from 0-70yds. Bow specs are 70lb Mathews Halon 5 @70/29" w/75% LO. All weights are assuming 100gr tips.
So which would you choose? Mass with highest momentum? Highest FOC with lower momentum? Sacrifice FOC and momentum for trajectory?
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