recomendations for zeroing FS rounds
Posted 30 October 2010 - 05:32 PM
Thank you in advance.
Posted 01 November 2010 - 11:02 AM
As for sighting in, i can help you there, but i need to know some things. How are you sighting it? are you firing from a bench with the gun locked in position? or are you firing it manually?
Posted 01 November 2010 - 02:37 PM
Posted 01 November 2010 - 07:01 PM
So to figure out if that's your problem or not - and to get a handle on what Benaiah was talking about - you're really going to need access to a chrono. Do you have a field nearby that would let you spend a somewhat extended amount of time at the chrono station? I'm assuming you're not interested in buying your own chrono...
If you want to be really creative, you could always use physics to figure it out. But you'll need a very accurate way of measuring a very small amount of time. Your velocity (in FPS) will be equal to the distance between your marker and the target (in feet) divided by the time between the marker firing and the paintball contacting the target (in seconds). There's no way that this will be an accurate enough method to check your marker's consistency unless you have an excellent way to measure the time period. But it should at least get you a ballpark number to make sure you're not way way below ~290FPS.
Posted 01 November 2010 - 07:14 PM
As i said above, the horizontal speed of an object has no affect on the vertical drop speed. However, the faster the object is moving, the farther you can get before you drop too far from your bore line. So yes, a low velocity will result in a lower trajectory, or a "faster" drop. Turning your velocity to the maximum field allowed speed will increase your range, and to some effect your accuracy, but with too much speed comes more instability in flight. There is a sweet spot, but like i said i dont know much about the specifics of the FS round. I am planning on getting a T9.1 rifle as soon as i can justify spending the cash.
Anyway, i hope this gives you some insight into the physics of ballistics so that you can better understand what is happening with your marker.
One last word of advice, squeeze the trigger, dont pull it. The shot should surprise you. This means you didnt react to the recoil until after the shot was fired. If you pull the trigger, you instinctively counter the recoil and throw off your shot. This usually results in shots that are low and towards your shooting hand (right if youre a righty, same for lefties). My dad once told me i was pulling and i didnt believe him. He "loaded" a round in and i pulled the trigger and shoved the gun into the table with my shoulder. There was no round fired. I had been throwing off my shots the entire time. this can be a huge problem if youre trying to sight a rifle.
if you want to learn more i would recommend googling it. the internet knows everything. Globalsecurity.com should have some army manuals on the subject. But be warned, once you enter the realm of target shooting, you will never go back.
Posted 01 November 2010 - 08:28 PM
Posted 02 November 2010 - 06:03 AM
I see what you mean. Thats definitely your velocity. Another problem you might encounter is with your sight. If the elevation window cannot change enough to keep up with FS round, you might need an adjustable rail. Lifting the back of the sight will let you get a little farther and still be in your sight window.
Some more physics: d=(1/2)g*t^2, or distance is one half the acceleration of gravity time time squared. This means that at 290 feet, which will take the round 1 second to travel (assuming youre at 290fps), the round will drop 5 meters. This is the same no matter what the speed is, because as you can see from the equation, speed has no affect. The time of travel does. So the farther you can go in one second, the farther you will have before you drop 5 meters (a little over 15 feet). This calculation is using the muzzle velocity, which will slow over time due to air resistance, so it be shorter than 290, but that would be a much more difficult calculation. For comparison, a normal, gunpowder round will travel much farther. The .223, or the 5.56mm NATO round (most M-16 based weapons, as well as others), will travel an average of 3300 fps, depending on bullet weight. as you can guess, this bullet will travel well upwards of 2/3 of a mile before dropping 15 feet. This means that many sights do not have a long enough elevation change to accommodate something like a FS round, so you may have to look into a different sight. You said the one you have is from the Tiberius FS rifles, so you should be fine. But if you are at a fast enough velocity, and still come up short at a reasonable range, you'll need to look into that adjustable sight riser.
Posted 05 November 2010 - 02:23 PM
Firing a distance of 290 feet in one second is an AVERAGE velocity of 290fps.
If you drive a car 50 miles in a 50 mph limit in exactly one hour - pulling off at the start point, and breaking to a stop exactly at the 50 mile point, then you must have been speeding at some point, as part of the time you will be accelerating or decelerating.
The requirement for a marker to be field legal is at the muzzle velocity.
If you fire at an average velocity of 290fps you will actualy have a greater muzzle velocity.
When a paintball or FS is fired it:
accelerates in the barrel (idealy with the optimum length barrel)
hits the atmosphere (idealy with minimum disruption due to porting etc)
flies through the air, possibly still accelerating a little then decelerating
hopefuly hitting target before decelerating too much to have a good impact
or traveling the maximum range and dropping off
This is the same as timing a car with running start at 50mph then disengaging the gears and coasting. It will not go for 50 miles and it will not take one hour. to do so you would need to be driving with enough speed and power to be able to coast the distance and quickly enough to average 50mph.
However in reality you won't be able to accurately identify the difference with a paintball.
This post has been edited by Tommikka: 05 November 2010 - 02:31 PM
Posted 15 November 2010 - 05:03 PM
In short, find a chrono.
Posted 18 November 2010 - 09:23 PM
Posted 02 December 2010 - 01:06 AM
Posted 05 December 2010 - 04:29 PM
Posted 07 December 2010 - 03:52 PM