Does everyone who owns a PCP have a chronograph? How do you find the "sweet spot" range if you don't. I am getting really close to buying my first PCP and don't want to spend the money for a chrono. Would drawing a long horizontal line on a large piece of cardboard and shooting from left to right along that line at my desired yardage "draw" a type of bell curve that would emlulate a computed graph? Crude, I know, but It would let me know how far outside the sweet spot that I would lose my acceptable accuracy both at too high pressure and too low pressure. Keep in mind that I won't move the horizontal crosshair above or below the line on the paper. Dumb question? Thanks
Finding the "sweet spot"
- Thread starter Sprocket
- Start date
really you need a chronograph for when you tune your gun and it makes drop calculations a lot faster over shooting the gun over and over for a feel effect there are ones that you can dl to your smartphone for free there not the best but they work
Upvote 0
Sure that will work. It won't give you velocity though. There is an app or two for smart phones that turn your phone into a chronograph. Uses sound. Not quite as accurate but works in a pinch. If you get serious about air gunning you will need a chronograph.
Upvote 0
Ok, next question. Let's say I have a brand new gun that the manufacturer specifies it to be .22 caliber with "up to 23 fpe" I don't know for sure what the actual fps is without a chrono. But for this purpose use 800 fps at the muzzle, 14.3 grain pellet. That combination yields 20.3fpe.at the muzzle. Target is at 35 yards. That is what I estimate most of my sparrows and starlings are at when they sit on the clothes line. Will a chrono tell me what my fps and fpe is on target? Won't those remain constant regardless of what gun or condition of gun the pellets come zippin' out of?
How do you decide whether you have enough whump at the target to get done what you want. Pellet is below target? Holdover.
Thanks. Bear with me I am trying to learn PCPs. I have always had springers.
How do you decide whether you have enough whump at the target to get done what you want. Pellet is below target? Holdover.
Thanks. Bear with me I am trying to learn PCPs. I have always had springers.
Upvote 0
Hey Spocket,
I am less than a year into this and consider myself one with limited knowledge. So take all this with a grain of salt.
If you have your FPS and pellet mass, Airguns of Arizona has a calculator that will give it to you--FPE. You can also move the chrony out to 35 yards and get your velocity there and then calculate the change.
But the best way to see your changing energy and velocity is to
to download ChairGun Pro from Hawke scopes. It will give your trajectory, energy retained at given distances-the whole nine yards. If you know the pellet name and mass it will have the ballistic coefficient in its memory--so you won't need to do that.
Hope this helps.
I am less than a year into this and consider myself one with limited knowledge. So take all this with a grain of salt.
If you have your FPS and pellet mass, Airguns of Arizona has a calculator that will give it to you--FPE. You can also move the chrony out to 35 yards and get your velocity there and then calculate the change.
But the best way to see your changing energy and velocity is to
to download ChairGun Pro from Hawke scopes. It will give your trajectory, energy retained at given distances-the whole nine yards. If you know the pellet name and mass it will have the ballistic coefficient in its memory--so you won't need to do that.
Hope this helps.
Upvote 0
really the aspects of energy shouldn't be too different pcp or springer it really comes down to grain/weight plus fps and like tex said youll want a ballistic calculator for that the one he says I use and it works amazingly well, shows drop off at yardage energy loss at interval distance, most of the stuff I need for range shooting on my phone so idk what's on computer other then the Chair Gun Pro
Upvote 0
Hi sprocket- there are many ways you can back into your velocity You mentioned 23 ft pounds and a .22. That sounds an awful lot like the Disco. Shooting at a measured range, and calculating your zero will put you very close to being able to calculate from chairgun. Then by using energy calculating charts, you can pretty accurately determine the speed and drop rate of additional pellets. I've got so many different parts in the Disco's I have no idea what's factory and aftermarket. at 800 fps with the JSB 18.1's shoot very well, and much better than the 14.3 Crosmans at about 50 fps greater. Imagine Buffalo Bill did it without a chrony or even a computer. A pizza box and a 100' tape will get you started. As the bug gets you you'll look to tweak to the max.
Upvote 0
G
Guest
Guest
Download Chairgun Pro from the Hawke website. You can analyze every combination of pellet and fps till your face turns blue. You will want a chrony eventually but Chairgun will get you started on learning about ballistics.
I just got in from setting my gun to 875 fps for a field target match tomorrow. A chrony helps if you are serious about targets but for hunting go with the highest power setting you get good groups with reliably.
I just got in from setting my gun to 875 fps for a field target match tomorrow. A chrony helps if you are serious about targets but for hunting go with the highest power setting you get good groups with reliably.
Upvote 0
If you know the BC of the pellet, AOA has a retained FPS calculator for any given distance. Once you know what your FPS is at the target and know the weight of your pellet, you can know your FPE at the target. I imagine this may be a bit simpler than the Chairgun Pro.
Upvote 0
BTW, being confined to 12ft.lbs. would be disappointing to me. As the famous Tim Taylor used to say: "More Power!" But then that's the American way. Thanks
Upvote 0
"I am getting really close to buying my first PCP and don’t want to spend the money for a chrono."
Nowadays you can get a basic used CHRONY ( F1 model) for $60 - 70 or a new one for around $90.00 ...A Chronograph is an investment and a must have for any serious shooter who wants to accurately know what is going on with his guns...After my cleaning jig this instrument is what I use the most.
You don't actually need the upper models, the simpler the better...I had a F1 and was very happy until I shot it with my BR rifle...Everyone present but myself got hysterical!... I then bought the Gamma Master with all the bells and whistles and I HATE it, too complicated when compared to the F1.
The good part is that they are cheap and if you decide you no longer need it, you can sell it anytime at eBay...
This used one is selling for $70.00
http://www.ebay.com/itm/SHOOTING-CHRONY-F1-Master-Chronograph-Crony-/331653889688?hash=item4d381cbe98
Regards,
AZ
Nowadays you can get a basic used CHRONY ( F1 model) for $60 - 70 or a new one for around $90.00 ...A Chronograph is an investment and a must have for any serious shooter who wants to accurately know what is going on with his guns...After my cleaning jig this instrument is what I use the most.
You don't actually need the upper models, the simpler the better...I had a F1 and was very happy until I shot it with my BR rifle...Everyone present but myself got hysterical!... I then bought the Gamma Master with all the bells and whistles and I HATE it, too complicated when compared to the F1.
The good part is that they are cheap and if you decide you no longer need it, you can sell it anytime at eBay...
This used one is selling for $70.00
http://www.ebay.com/itm/SHOOTING-CHRONY-F1-Master-Chronograph-Crony-/331653889688?hash=item4d381cbe98
Regards,
AZ
Upvote 0
"I had a F1 and was very happy until I shot it with my BR rifle…Everyone present but myself got hysterical!"…
Azuaro: I read that and the first thing I thought of was of a guy years ago from near here that was mounting a CB antenna on top of his pickup. He decided to blow a hole for the wire with a handgun from inside the truck. He got the hole he wanted, but promptly killed his garage door opener graveyard dead.
Azuaro: I read that and the first thing I thought of was of a guy years ago from near here that was mounting a CB antenna on top of his pickup. He decided to blow a hole for the wire with a handgun from inside the truck. He got the hole he wanted, but promptly killed his garage door opener graveyard dead.
Upvote 0
"He decided to blow a hole for the wire with a handgun from inside the truck...but promptly killed his garage door opener graveyard dead."
Ha, ha, ha!...I know the feeling...
At that time I had finished a BR (.22 RF) that turned out very accurate...a great deal of that was that for some reason it was very consistent, I had very good ignition and something like 7-9 fps shooting Eley Tenex which is extraordinary for a .22 RF, even for a BR gun...
Man!...I was as proud as a peacock!...Shooting some strings through the Chrony time and again, my friends were witnessing and as always happens: everyone but me had a good explanation for why it was so darn consistent...I lost my concentration and shot the darn Chrony, needless to say how fun it became for the crew...
They named my gun "Mission Impossible"...If you remember the original series, the mission was recorded and given to the agents and then it self destroyed once the agent had seen it...Some years later these friends still cover their Chronys when I arrive insinuating I will not be able to shoot them...I never thought that $70 dollars worth of equipment would bring so much laughter...
Ha, ha, ha!...I know the feeling...
At that time I had finished a BR (.22 RF) that turned out very accurate...a great deal of that was that for some reason it was very consistent, I had very good ignition and something like 7-9 fps shooting Eley Tenex which is extraordinary for a .22 RF, even for a BR gun...
Man!...I was as proud as a peacock!...Shooting some strings through the Chrony time and again, my friends were witnessing and as always happens: everyone but me had a good explanation for why it was so darn consistent...I lost my concentration and shot the darn Chrony, needless to say how fun it became for the crew...
They named my gun "Mission Impossible"...If you remember the original series, the mission was recorded and given to the agents and then it self destroyed once the agent had seen it...Some years later these friends still cover their Chronys when I arrive insinuating I will not be able to shoot them...I never thought that $70 dollars worth of equipment would bring so much laughter...
Upvote 0