What is the weight of the arrow that Centerpoint uses to test for feet-per-second on their bows?
Gabowman
Centerpoint Speed testing
The arrows Center Point archery are selling on their website is 400 grain which includes the 100 grain point.
These arrows are 20".
My Center Point Sniper XT390 is advertised as shooting a 370 grain arrow point combination at 390 FPS.
As tuned I am averaging 397 feet per second with that 370 grain arrow point combination as shown in my
Pro Digital Chronograph placed one foot in front of the riser bolt.
My 20" Blood Sport Witness arrow weighing 325 grain plus 100 grain point = 425 grain averages 382 feet per second.
Most companies will use a lighter arrow point combination to get their advertised speed but do not recommend
shooting that weight.
Wishing you all the best.
Take care.
These arrows are 20".
My Center Point Sniper XT390 is advertised as shooting a 370 grain arrow point combination at 390 FPS.
As tuned I am averaging 397 feet per second with that 370 grain arrow point combination as shown in my
Pro Digital Chronograph placed one foot in front of the riser bolt.
My 20" Blood Sport Witness arrow weighing 325 grain plus 100 grain point = 425 grain averages 382 feet per second.
Most companies will use a lighter arrow point combination to get their advertised speed but do not recommend
shooting that weight.
Wishing you all the best.
Take care.
The 370 gn arrow was used for testing in 2017/2018 and that weight used today might get them to the "up to" advertised. ManKung version speeds are notably less than what CP publishes. All that considered, it's not a big deal to me if they are 10-15 fps slower than advertised. Many of their bows are still excellent buys. A 415 fps Wrath is pretty good. I'm hunting with a 490 gn arrow and my 430X at 370 fps is acceptable.
You cant go by what they publish thats for sure.
My Sniper 370 has always produced the up to speeds with a 370gnish arrow. I guess I got lucky. 350 fps with a 425gn.
They list that the Patriot/Amped 425 shoots up to 425 fps with 160lbs of KE. For it to have 160lbs of KE it must be shooting a 400gn arrow at 425 fps which is false. Very similar specs published for the Wrath as well.
I haven't shot the supplied 400gn arrow that came with my Amped 425. It does shoot a 450gn arrow at 382fps. A 435gn 387-389fps. I'm guessing around 400fps with the 400gn. I may run a 400gn through the chrono just to see. I wont do a 370gn though. But suspect thats where the 425fps was supposed to come from.
I'll also add published draw weights differ. Some say 195lbs for the 425's and some say 200lbs
Specifications
![Patriot 425 Compound Crossbow with Power Draw]( "Patriot 425 Compound Crossbow with Power Draw")
Reviews
My Sniper 370 has always produced the up to speeds with a 370gnish arrow. I guess I got lucky. 350 fps with a 425gn.
They list that the Patriot/Amped 425 shoots up to 425 fps with 160lbs of KE. For it to have 160lbs of KE it must be shooting a 400gn arrow at 425 fps which is false. Very similar specs published for the Wrath as well.
I haven't shot the supplied 400gn arrow that came with my Amped 425. It does shoot a 450gn arrow at 382fps. A 435gn 387-389fps. I'm guessing around 400fps with the 400gn. I may run a 400gn through the chrono just to see. I wont do a 370gn though. But suspect thats where the 425fps was supposed to come from.
I'll also add published draw weights differ. Some say 195lbs for the 425's and some say 200lbs
Specifications
| Velocity | Up to 425 fps |
| Kinetic Energy | 160 ft-lbs |
| Width (axle-to-axle) Cocked | 12" AXLE - AXLE |
| Width (axle-to-axle) Uncocked | 15.75" AXLE - AXLE |
| Draw Weight | 200 lbs |
| Power Stroke | 14.50 in |
| Weight | 7.8 lbs |
| Product Length | 35.8 in |
| String Length | 35.11 in |
| Overall Length | 35.8 in |
| SKU | C0005 |
Reviews
Over the years crossbow manufactures probably had complaints something like "my buddy and I have the same
make and series of crossbows, shooting the same arrow point weight combination but one crossbow is shooting
faster than the other". They could have got together to use the same chronograph, shoot through the same area
and use the same arrow-point weight. So to prevent conflict, they changed their advertisement to "up to" in regards
to speed.
I personally have experience with the same brand and series of crossbows shooting different speeds when both
were tuned identical. Cams in the same position and same axle to axle measurements.
Here are some things that can cause differences in speed in feet per second from one crossbow to the other.
1)different limb deflections, 2)bowstring and or cables serving tighter on one which makes that area stiffer.
3)a bearing with more grease makes for a tighter fit. Axle holes in the bearing or bushing not properly manufactured,
over size or too snug. 4)more downward pressure on the bow string and or arrow retainer causing more friction.
In order to have both crossbows shooting the same speed, advance the cams in the slow one or back the cams off
in the faster one. The crossbows will both be in time but the cams will be in a different position from one crossbow
to the other. The axle to axle measurements can differ but this is just a guide line.
Another example I found with two crossbows of the same brand and series. The riser from one would inter change
with either rail-stock. However the other riser would only fit it's own original rail-stock. There was a difference in
machining causing this.
Wishing you all the best.
Take care.
make and series of crossbows, shooting the same arrow point weight combination but one crossbow is shooting
faster than the other". They could have got together to use the same chronograph, shoot through the same area
and use the same arrow-point weight. So to prevent conflict, they changed their advertisement to "up to" in regards
to speed.
I personally have experience with the same brand and series of crossbows shooting different speeds when both
were tuned identical. Cams in the same position and same axle to axle measurements.
Here are some things that can cause differences in speed in feet per second from one crossbow to the other.
1)different limb deflections, 2)bowstring and or cables serving tighter on one which makes that area stiffer.
3)a bearing with more grease makes for a tighter fit. Axle holes in the bearing or bushing not properly manufactured,
over size or too snug. 4)more downward pressure on the bow string and or arrow retainer causing more friction.
In order to have both crossbows shooting the same speed, advance the cams in the slow one or back the cams off
in the faster one. The crossbows will both be in time but the cams will be in a different position from one crossbow
to the other. The axle to axle measurements can differ but this is just a guide line.
Another example I found with two crossbows of the same brand and series. The riser from one would inter change
with either rail-stock. However the other riser would only fit it's own original rail-stock. There was a difference in
machining causing this.
Wishing you all the best.
Take care.
So.....it would be a fairly safe bet that my Excalibur Vortex 330 is shooting close to 295 fps with a 455 grain arrow. (455-350=105/3=35...330-35= 295 fps)
And my CP Sniper 370 is close to 342 fps with the same weight arrow. (455-370= 85/3=28.33...370-28= 342
And my CP Patriot 425 is close to 397 fps with the same weight arrow. (425-370= 55/3=28.33...425-28=397 fps)
???????????????????????????????????????????????????
And my CP Sniper 370 is close to 342 fps with the same weight arrow. (455-370= 85/3=28.33...370-28= 342
And my CP Patriot 425 is close to 397 fps with the same weight arrow. (425-370= 55/3=28.33...425-28=397 fps)
???????????????????????????????????????????????????
The Excalibur and the Sniper seam close to me. I'm getting 382fps with a 450 gn out of my Amped. And 400fps with a 400gn.
So I'm not seeing 397 with a 455gn.
I'll also add my cams seem pretty far advanced and my ata is dead on at 15.75"
Bring them down sometime and shoot them through my chrono.
So I'm not seeing 397 with a 455gn.
I'll also add my cams seem pretty far advanced and my ata is dead on at 15.75"
Bring them down sometime and shoot them through my chrono.
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