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Hello,
concerning the low velocity first shot; the air travels from the high pressure tank (1) thru the regulator (2) to the chamber “plenum” (3) and sits there until you pull the trigger, when you pull the trigger and the hammer hits the valve, the air travels thru the valve to the transfer port up to the barrel behind the pellet(4), at the same time phases 1,2 and 3 recycle until you pull the trigger again.
So during phases 1,2 and 3, the air fill to chamber “plenum” with the needed pressure fixed on the regulator, let’s say 150 BAR, at this exact moment the temperature of the air rises inside the chamber because of pressuring it. if you leave the rifle for some time without shooting it, the air inside the chamber loses temperature thus pressure (no more 150 BAR). so the first shot you’re gonna take will have lower pressure then it’s support to have right after phases 1,2 and 3.
This is why during PCP competitions, we take blank shots (air only) to get consistent air pressure before shooting on the target, or even after filling the high pressure tank because the new air will have high temperature thus high pressure and we will lose consistency when temperature changes.
Thank you for giving time for the PCP, this field is very delicate and wide and your videos are important.
That makes sense and I’ll keep that in mind. Thank you!
Anything else you see or would like to see covered in the testing?
-Bryan
Yes please, later on kindly test the same pellets/slugs with Lothar Walther and CZ barrels. It is very interesting the know the behavior of the projectiles shot thru different barrels and grooves.
Thank you.
As for the pellets, if you want consistency in velocity and accuracy you will have to sort the pellets per weight and head size, and the heavier the pellet, the more weight deficit you will find.
Ziad might be right but it’s also possible you have a small leak causing the plenum pressure to be lower on the first shot. You can check that quickly with soapy water.
I’m sure more testing is coming but the real competitors will be using pellets or slugs (not hybrid slugs). Make sure to test out Nielsen slugs and JSB pellets. This was what the original FX barrels were designed around and I think are probably the most commonly used.
When testing slugs try to get a much faster velocity 1050+ FPS.
Because these projectiles are so soft a lot of competitors look over each projectile for damaged skirts. These are fairly common to find and I’m sure would throw off the BC curve.
I suspected that as well, considering it doesn’t happen to the same extent on both guns…
Thanks for the advice on the projectiles and velocities to test. We will get there. Now is just the learning curve where I’m figuring out how to control things, change barrels, etc. Yesterday was an adventure as I installed the power kit (heavier hammer, lighter return spring, etc.) Thankfully there’s tons of online videos which are helpful. My aim isn’t to recreate those ‘how to’ videos; instead I hope to provide something that is lacking which is accurate projectile models that can be used in the AB software to support accurate long range fire solutions – THAT’S my JAM!
-Bryan
I am so glad that you’re finally doing this testing and sharing the information. I’ve been testing airgun slugs for a long time but obviously don’t have the technology you do. I’m excited to see what you come up with!
Unfortunately I cannot see any of the videos, tried several but they all come up as a silent black box.
Just wondering how this all turned out , I am curious. I would be interested in any results, as I have been fooling with air rifles for many years.
Just retired and have time to tweak.
This means a lot to the Airgun community and with the introduction of the fx panthera “a dedicated prs pcp air rifle” and soon the fx drs pro that is literally a pcp in a mdt chassis these airguns are gonna start growing in popularity even more then they already have and that’s when you’ll probably start getting even more requests to conclude the research and have actual cdm’s oh I can’t wait to see the end results of these test thank you Brian for helping us better understand air propelled lead projectiles it’s very much appreciated 🙂
Altaros 31gr belted slugs are quite interesting as they resemble the profile of a 22 cal standard long rifle bullet more than a typical air rifle slug with a meplat. The belt reduces friction in the barrel. An Air Venturi Avenger pcp with a 18:1” twist at 2900 psi and 6 turns on the hammer spring can achieve reasonable accuracy at 930fps. The gun has a large external plenum added to make this possible.
I weigh every slug and pellet I shoot. The variance is quite high among pellets from different dies and less if from the same die. Slugs vary less but still vary. Slug diameter is key to consistency due to the barrel friction twist interaction. Every air rifle barrel is different since the manufacturing tolerances are not as precise as they ought to be. Shooting a large variety of pellets and slugs will tell you what works. The Altaros slugs are CNC machined so have been the most consistent slug I’ve weighed or measured the diameter of. I’d just try a variety and see what you get.
I am trying to get to the bottom of a question that I can’t find any good answers to and this video has given more to think about. I have been doing a LOT of testing with subsonic ammunition in multiple calibers and I am at the point now where I am being limited by my understanding of external ballistics and fluid dynamics or the price of equipment needed to get further insight. The summary of my findings so far is that the longer a subsonic projectile gets, the more dispersion increases. We already know that 22LR subsonic can be extremely precise with dispersion under 1 MOA but that same does not seem to hold true for heavier or longer projectiles like in .300 Blackout and 8.6 Blackout. 8.6 Blackout seems to be affected the most since the .338 projectiles are very long. I have found that decreasing the velocity improves the dispersion significantly. I am wondering is this due to normal shock due to supersonic airflow? As an example, with a 20 shot sample of each: at 1056FPS the dispersion was 3.6MOA but at 900FPS it dropped down to 1.9MOA. Is this a problem that can be solved by a different bullet design or is this some kind of inherent problem at subsonic speeds (like normal shock)?
I know you guys are currently working on Air rifles and hopefully that work will translate to subsonic centerfire cartridges but any insight you can provide would be greatly appreciated.