I purchased my sig mcx virtus pcp being hesitant at first but looking into mods for it and how far I could push its limits before getting it I ended up settling on it for the price the looks and the semi auto aspect and of course the availability to mod it I purchased 23 grain slugs .217cal/5.51mm with the intent of running them at higher velocities on the platform I will say running stock this platform absolutely slings slugs I pushed it to 1400 psi output here are some pics for the journey of the power gain I sadly forgot to take pics of damage on the half inch thick ash wood boards from the stock reg but here’s the 1400psi output and 2000 psi output difference p.s running stock these slugs will just make a decent hole/dent but bounce out once it was pushed to 1400 they started sticking into the wood board the bigger valve stem/striker on the reg nipple/tip ensures a more consistent and prolonged flow rate along with pushing the platform at the desired 2000 psi output mine runs at this flawlessly no issues so far I’m getting about 800 fps with the slugs at 1400 psi output and around 1000+ at 2000 psi output the higher output makes the air pressure fluctuates just a little so fps drop is more noticeable between shots at this output but so are gains in fps but that’s the only issue I’ve had so far running at this pressure but it’s not too big of a deal and yes my barrel has been tightened and I did not change any other internals beside taking a sandpaper drill bit tip and sanding down the inner tubing of the port valve for the higher flow rate to be handled more quickly and safely instead of bursting it out witch would be entirely bad also the stock reg was replaced with a 2200 psi output witch is the one on the right in the photo with the bigger fill valve stem but I took a few shims out and decreased it until it hit 2000 even and I had the stock reg tuned at 1400 psi and interchanged between them and tested them out I hope everyone enjoys the results it took a lot of hard work and determining what configurations would work and how to ensure the safest way for it all to work etc.
P.s I don’t have a chrony so it’s hard to tell the fps but with the help of online calculators and from the help of chatgpt and the fellow Airgun community I was able to determine the pressure output of the regulator as I progressed through the different pressure levels etc to conclude what I have been running on and using those calculations to determine the fps with this particular platform and the weight and shape of the slugs etc also I will note that I got about 800fps at 1400 and just around 1000fps at 2000 it’s very close to going supersonic witch is more visible to hear at the 2000 psi output mark when shot outside you can hear the slugs interacting with the air waves forming around it and gives it that echoey crack like a .22short
You lost me at doesn't haz chrony. Just sayin.
@gratewhitehuntr you can use varies methods of calculation to determine the velocity based off of the psi output it’s about as good of an estimate as you can get this platform gets about 63.6fps per 100 psi output on an average scale so if you do the math you will get the numbers I’ve stated witch isn’t far off if you compare the ballistics and output etc to other platforms a chronograph isn’t needed but definitely helps and saves the hassle of doing the math and research.
Fine. You lost me at the wall of text.
Otherwise, YOU can use a variety of methods.
I coughed up the $100, because things like ES and SD matter (to some folks), and decades reloading has taught me better than to use generic inputs like slug shape.
Do you not see people sorting pellets by head size? FFS man even alloy has effects.
You know what would be really entertaining?
Buy a chrony and check your work.
@gratewhitehuntr I got one one the way along with an aftermarket air port valve also if your implying that I had es with these slugs than you are mistaken I just shot randomly all over the board where I hadn’t already shot before etc and slug/pellet shape and weight along with barrel length, flow rate and psi output can give you a very good understand of fps and energy transfer just as long as you can comprehend basic mathematics and you can always get help understanding these things it took me a long time to full comprehend all the different variables when it comes to modding airguns and don’t be mistaken the sig mcx virtus isn’t my first modded Airgun I have a Hatsan edge .25cal I replaced the spring with a better aftermarket one about a year ago and it pushes 29grain slugs at 700 fps also I a umarex mp5k with an hpa adapter hook up and have ran it on 1100 psi output pushing 5.5grain bbs at approximately 500-550 fps it’s easy to determine a projectiles fps it’s not that hard even slowly recorded decibel readings will give you the average fps of your projectile if recorded and examined right it’s not rocket science my guy.
it’s not that hard even slowly recorded decibel readings will give you the average fps of your projectile if recorded and examined right it’s not rocket science my guy.
Citation please. First I've heard of this despite being an avid reader in acoustics, wave propagation, and fluid dynamics.
Always exciting to learn something new!
Addressing your retort on ES, it neglected SD, the standard a discerning consumer might like to see for judging regulator performance.
Also, I'm stating as a matter of fact that "Slug Shape" is about as reliable a factor as "Beach Sand" for a host of reasons I'll forgo here, since you are not casting or swaging your own. Could you please list the brand and model of slug?
@gratewhitehuntr https://www.airgunforum.ca/forums/topic83141.html
this is just a forum going over all of it in a way you can understand more in depth it’s obviously less of a hassle to get a chronograph like I stated before but other methods of determining fps can be done also there’s videos of people doing the spl/fps test on YouTube.
@gratewhitehuntr and if you’ve been airgunning for years I’m surprised you are not aware of these other methods but all in all I do agree a chronograph makes everything so much simpler.
He posted chronograph data as a baseline, and a buttload of caveats. The other posters offered variables, which I've omitted from my replies. That's Hector's job anyway 🤣 he inspires me to make shorter posts.
It appears that you lack a baseline, or that you attempted to arrive at one through extrapolation, therefore extrapolation on top of extrapolation.
Netizens call that "Bro-Science" although it should be "Bro-Ology" imho.
Where are there multiple white papers detailing reproducible AUDIO determination of projectile velocity based on bore diameter and length, projectile weight, and sound pressure level? I'm only asking for your maths, or proof that someone else has done them. Someone other than that guy.
In this day and age "netizens" are more concerned with being right than with getting it right. I wish everyone luck with this thread.
@rockdoc65 can’t disagree with that have a blessed day man
@gratewhitehuntr just look around there’s videos and forums everywhere about it also this was not the method I used considering it’s much less accurate than basing the fps off of the average linear psi output like I stated before the average fps per 100 psi is 63.6 on this platform I was simply stating to you that there are methods out there other than just using a chronograph and with the right skill and knowledge they can be accurately done and science and math is full of unknowns and knowns so you stating that my baseline was pointless has no meaning in itself.
All I see is "DYOR" with an utter lack of formulae or reference, it's very flat-earth DYOR-esque.
Hey but, everyone deserves the benefit of the doubt. Amirite?
What are OP's qualifications? Let's start with the inability to use punctuation or sentence structure.
Is that speech-to-text?
If a person combined speech-to-text with text-to-speech, they could be online, while being completely illiterate.
You're right. I'm being a mean old man by asking for ANY sort of equation or citation.
Edit to correct myself. His replies HAVE been punctuated, with derision toward my questioning.
@gratewhitehuntr at this point you’re just making yourself look like a jackass my guy I haven’t done anything wrong to you buddy hell I don’t even know you I’m just putting the info out there for others who need help modding this platform I never pulled a trust me bro moment everything you’ve asked I’ve provided more than enough cited methods talks about those methods and told you to do more research on it yourself if you are so highly intelligent and knowledgeable on the matter witch obviously you are not if you are second guessing if there’s any valid method other than a chronograph I may ask btw how do you think they get the sum of the acceleration in fps of a giant rail gun, missiles, fighterjets etc they use different methods of calculation so buddy it’s mot that deep unless you have a mind of a 5 year old and can’t comprehend basic knowledge also all the work put into my platform step by step I have personally seen the gains and the upscale in power output and have done plenty of research to get where I’m at so who the hell are you to tell me that the work I’ve put into figuring out the formulas and everything else along the way is wrong witch I could be and I never said I was 100% right I already told you the methods used are basic estimation methods witch could make fps be off by 0-100 fps easily but I would say not much more than that if you do the math with the knowledge of barrel length, ammo weight, output pressure, flow rate etc etc like I stated scientist can’t just use a chronograph when measuring the speed of a lot of worldly objects so stop being a troll.
@gratewhitehuntr at this point you’re just making yourself look like a jackass
Asking someone to show their work, so that I might correct my ignorance, is how smart people get smarter.
I'm OK with looking like a jackass. Every time I take on a new hobby, I'm a newb, and it's part of trying new things.
my guy I haven’t done anything wrong to you buddy hell I don’t even know you
Irrelevant.
I’m just putting the info out there
Debatable.
everything you’ve asked I’ve provided
White papers (plural) or a formula or equation. Calibration data would be a nice followup.
more than enough cited methods
I'll be the judge of when I am intellectually satisfied, thank you very much. Current citations = ZERO.
and told you to do more research on it yourself
I'm not your Mom. Watch your mouth boy.
if you are so highly intelligent and knowledgeable on the matter witch obviously you are not
Smell that ladies? That's what incel smells like.
btw how do you think they get the sum of the acceleration in fps of a giant rail gun, missiles, fighterjets etc they use different methods of calculation
First, this isn't valid question. You have listed too many distinct fields for a reasonable answer to be made.
Second, LIDAR is widely used, along with myriad calculations of variables including propellant burn rates, atmospheric pressure, elevation, Coriolis Force, nozzle profile, in infinitum ad nauseam. Rail guns are a welfare program. GTFO with that nonsense.
so buddy
Don't call me buddy, Pal.
like I stated scientist can’t just use a chronograph when measuring the speed of a lot of worldly objects so stop being a troll
I carefully vet those I troll, to ensure my time is used wisely. Don't flatter yourself friend.
Now, how many more words can you type to cover your lack of mathematically verifiable evidence for the claims you've made?
Or is it just the lack of a chrony? Speech-to-text, text-to-speech.
@gratewhitehuntr I’m done wasting my time with you buddy I hope you know LiDAR is used by sending sounds waves out and waiting for them to be bounced back and from the alone they can tell where they object is and how fast it is going etc etc so you kind of proved my point bringing up LiDAR and yes there are obviously tons of ways to detect the speed of an object you just proved my point once again once I get my chronograph here in a week from Amazon I’m gonna post the results and I bet you I am right around where I predicted.
@gratewhitehuntr I’m done wasting my time with you buddy I hope you know LiDAR is used by sending sounds waves out and waiting for them to be bounced back and from the alone they can tell where they object is and how fast it is going etc etc so you kind of proved my point bringing up LiDAR and yes there are obviously tons of ways to detect the speed of an object you just proved my point once again once I get my chronograph here in a week from Amazon I’m gonna post the results and I bet you I am right around where I predicted.
LIDAR is Laser, NOT sound waves. It's used by satellites for hyper accurate mapping of the Earths surface, NOT measuring the speed of objects. This entire thread lacks any and all legitimacy. Administrators, please mercy kill this thread.
@rockdoc65 I had it mixed up with sonar that is my bad.
Quite frankly, I don't think that's all you have mixed up. Your original post lacks coherence, proper punctuation and sentence structure. You claim to be doing something resembling science but you lack any type of rudimentary measuring equipment. You don't even use official targets that anyone could buy thus making your work repeatable. You seem to think that "dents" and "bounces" are some sort of valid data. Given your VERY recent membership to this forum and low post count I suspect that at best you are a shill for the product that you are discussing, and at worst, a troll.
Please take a deep breath and carefully consider your next move. This is an otherwise excellent forum and its members have a very low threshold for BS. Greatwhitehunter is not always the easiest person to converse with but he's no idiot. His points are valid and any abrasiveness he has shown towards you, I believe, are out of pure frustration.
Admin, I think this thread is a candidate for a lock. If I have steeped over the line with my "calling out," I apologize and accept whatever probation you may dole out.
Thanks.
