How much Power can the MrodAir P12 generate...

[smythsg]

I read a very amusing post recently on another forum about a chap with a SPA P12 attempting to shoot the slug from a .22 LR bullet in a P12... Unfortunately the poor chap made claims that sent him down in flames amid his very skeptical forum mates...

That got me to thinking about what my MrodAir P12 could really do, so I ordered some heavy pellets that came in today and will post some chrony results in the next couple days. As a baseline, I will state that any pellet below 18 gn can easily be sent supersonic by the P12.  14.3gn pellets shooting at about 950 fps will give me between 35-40 good shots. I have some JSB 18 gn pellets but have not tested them yet. My goto pellet is the 21 gn Baracudas shooting at 925 fps for 40 ft lbs and giving 25-30 good shots, so the P12 is perfectly happy being a 40 ft lb gun (and very accurate).

I will be testing the following .22 cal heavy pellets for power first, and then for accuracy. The P12 is bone stock, and the only thing I will change during the tests will be the hammer spring and pre-load adjustment, which can be easily done without taking the gun apart and with no tools.

JSB Exact Jumbo Monster - 25.39 gn
H&N Rabbit Magnum II - 25.62 gn
JSB Exact Jumbo Beast - 33.956 gn

According to Chairgun Pro, if I shoot the Monsters at 900 fps I will be a tad over 45 ft lbs, and at 950 fps I will be over 50 ft lbs.
If I can shoot the Beasts at 900 fps I will be over 60 ft lbs, which is pretty incredible for a stock China .22 cal bullpup.

Now for the record, this test is purely to see what kind of power I can realistically generate with the two hammer springs that came with the gun. ( Unfortunately, I already cut a couple of coils off the stock heavy spring because I could not get the Cudas down to 925 fps )  This is not about efficency or shot count which will both be poor at these power levels. I will not be over filling, but will start at 3000 psi, and will have two chronys sitting side by side for results.

I did shoot a couple of Monsters over the chrony late this afternoon just to see what the gun will do at its current setting. They measured about 877 fps so with a 1/4 turn of the pre-load adjuster I can easily hit the 45 ft lb mark. The one Beast I shot was 755 fps, so I have a good ways to go to hit 900 fps with that pellet. This should be an interesting test so stay tuned for the first batch of results in the next couple days.

[Rallyshark]

This should be interesting!  I actually bet your P12 will do pretty good with the heavy stuff, but time will tell.  I wish I could fit the beasts in my guns   Hurry up and post those numbers.  Inquiring minds want to know about these things!

[smythsg]

Yep, they don't call them "Beast" for nothing... sitting side by side the top of the Monsters come only to the top of the skirt of the Beast. I can't imagine that they will fit any magazine, so likely only guns with single shot trays will be able to shoot them. The Rabbit Magnums are interesting looking pellets, but I have not heard too many good results in the accuracy dept.

[Rallyshark]

Yeah, the rabbits shoot like poo out of both my guns.  They just aren't accurate for me at least.  Like you say, I haven't heard of anyone saying they shot well...  As you well know, The JSB 25.39s are pretty much the limit for my magazines without going to some BBT 30 gr cast lead.  I don't really "need" anything heavier though.  I was playing with the AT-44 tonight, and did a 10 shot test with the 25 grainers.  The average was 977fps with an ES of 13, so she's still got the juice, and that wasn't all it had  

[smythsg]

I would be very happy with those numbers, especially with an ES of 13. You must sleep with that one at night...

[Rallyshark]

Actually, I haven't even taken that gun out of the case since I got my Bullboss, until a couple of weeks ago.  I decided I was going to try and tune it for more power un-regulated, since I got the SWFA for the Bullboss and I could put the UTG on the AT-44.  I've just been "playing" with it, and still haven't decided on a tune, much less put any pellets on target with it.  I've changed it some since my last real shot string test, which was 926fps average for 20 shots with an ES of 27(I think) with the 25.39s.

Enough about that though.  Why haven't you posted chrony numbers yet, and what's taking so long?  If you have time to be typing on here, you could be shooting! If you have lights for the chrony that is...

[smythsg]

Assuming the Monsters shoot well in the P12 about 925 fps is where I would like to settle in. As for shooting at night, (haha) I already have one chrony that has taken a couple hits ( but still kickin ) Have to wait until morning...

How do you like the SWFA? I bought a Hawk Vantage, but have pennies saved up for the SWFA Black Friday sale..

[Rallyshark]

Words cannot express how much I like that SWFA!  It is pretty freaking awesome, and very clear.  It is steal of a scope for the money in my opinion.  I went with the MOA Quad reticle though.  Jesse's was the Mil Quad.  I like having the the numbers on there for reference.  I makes it much easier for me to quickly get to the right hold over when needed.  I also operate better with MOA, and it is a bit finer adjustment than .1 milrad. 

I have found that the monsters do best at the 920-940fps for me.  I think a lot of people have said the same, that they don't as do well unless you push them pretty fast.  I don't have a real clue of how fast the P12 is going to be able to push them, but there aren't a ton of .22s that will push them fast enough.  I'd think it should be able to get to the upper 40s in fpe at least though?

[anti-squirrel]

Lots of typing, no Chrony results?!?!?  You do realize OTHER people here are still waiting, right? 

The P12 is on a short-list of potential next purchases for me, along with the Orion BP and the Kral Puncher Breaker shrouded (they need to work on their names).  I'm torn between .22 and .25, but for my needs and the power levels all three bullpups can produce, a .22 is plenty and cheaper to shoot.

[smythsg]

Ok Ok...bowing to the pressure, I was able to put a few rounds across the Chrony late this afternoon and the initial results  (ta daa...) are that the P12 is going to make 45 ft lbs and that is about all without working on the transfer port and other transgressions. I plan to do more testing tomorrow, but my initial few test shots showed the max velocity I could get with the Monsters with my currently modified (2 coil shortened stiff spring) was 900 fps. I suspect that with an unmodified stiff hammer spring that might be extended to maybe 47 ft lbs but probably no more. Short of the 50 ft lbs I had hoped she could do, but more testing on the way.   

Just remembered that I did install the MrodAir hammer de-bounce kit and it did make a little difference in the power the gun was making. I may remove that tonight to see what difference that will make on overall power tomorrow.

Tomorrow I will test the other pellets and provide a follow up to see if the gun just doesn't like the Monsters or if that is really all she's got. The P12 is still a powerful, versatile .22 cal in stock form

[smythsg]

Peter, I looked at those two "funny named" guns and they both look quite nice. Not exactly an apples to apples comparison with the P12, as they are both multi-shot and the base P12 is single shot. The web says that both can produce 50 joules, which the calculator says is about 38 ft lbs, and we know that the P12 can do at least 45 ft lbs with just external adjustments (but then again they may be able to be adjusted for more power as well). Not sure about pricing, but I suspect the P12 will be at least a couple hundred dollars less than the funny named guns, maybe more.

I certainly understand being torn between .22 and .25 cal as I used to own an Airforce Condor in .25 cal that could do 80 ft lbs stock, and I still love the big .25 cal pellets. One of the reasons that I wanted to do this test is to see if I really want to stay with .22 cal or sell the P12 and go back to a .25 cal. ( One is never satisfied in this hobby, have to keep trying different things... ) I do like the Bullpup format, it works well for my style of hunting...always on the move.

The P12 will shoot dime sized or smaller groups at 35 yards using the 21 gn Cudas at 40 ft lbs and will make you smile doing it. (and backyard frieldly at those power levels) That means that with proper shot placement, nothing short of small pigs and large yotes are out of reach at reasonable range. On the other hand, where I hunt, there are an abundance of large (not huge) pigs and large yotes, hense my love of the .25 cal.

[Motorhead]

That is some serious power indeed !!

[thelast88]

When I get my SPA P12 5.5, first test are full power. Korean cliff string of course, and way to loud... 

Gun was filled to 3200psi (220bar, green portion of gauge) and shot couple of rounds, heaviest I have is the H&N Baracuda (Kodiak) 21.14 gr and it's shooting them at 1047fps (319m/s) or 52fpe. JSB Exact Heavy was traveling at 1100+ fps for 49-50fpe. I can just imagine what would happen with the Eunjins, JSB Beasts or something that heavy, but I think that the 60fpe max is doable. That's "only" 890 fps with the Beasts. 

[customcutter]

Lots of typing, no Chrony results?!?!?  You do realize OTHER people here are still waiting, right? 

The P12 is on a short-list of potential next purchases for me, along with the Orion BP and the Kral Puncher Breaker shrouded (they need to work on their names).  I'm torn between .22 and .25, but for my needs and the power levels all three bullpups can produce, a .22 is plenty and cheaper to shoot.

Peter,

You should check out the P-10 and P-12 on the Krale"whatever" that european site is you keep posting.  I think it's around $500+ shipped, on sale right now  IIRC.

[anti-squirrel]

Lots of typing, no Chrony results?!?!?  You do realize OTHER people here are still waiting, right? 

The P12 is on a short-list of potential next purchases for me, along with the Orion BP and the Kral Puncher Breaker shrouded (they need to work on their names).  I'm torn between .22 and .25, but for my needs and the power levels all three bullpups can produce, a .22 is plenty and cheaper to shoot.

Peter,

You should check out the P-10 and P-12 on the Krale"whatever" that european site is you keep posting.  I think it's around $500+ shipped, on sale right now  IIRC.

I've looked at both Krale-Schietsport and Aceros de Hispania, and the Orion bullpup offers similar ergonomics with a hammer-forged barrel and a built-in regulator.  Plus I like the weaver rail on the bottom of the forestock.  Cometa builds REALLY nice airguns.

[Rallyshark]

Ok Ok...bowing to the pressure, I was able to put a few rounds across the Chrony late this afternoon and the initial results  (ta daa...) are that the P12 is going to make 45 ft lbs and that is about all without working on the transfer port and other transgressions. I plan to do more testing tomorrow, but my initial few test shots showed the max velocity I could get with the Monsters with my currently modified (2 coil shortened stiff spring) was 900 fps. I suspect that with an unmodified stiff hammer spring that might be extended to maybe 47 ft lbs but probably no more. Short of the 50 ft lbs I had hoped she could do, but more testing on the way.   

Just remembered that I did install the MrodAir hammer de-bounce kit and it did make a little difference in the power the gun was making. I may remove that tonight to see what difference that will make on overall power tomorrow.

Tomorrow I will test the other pellets and provide a follow up to see if the gun just doesn't like the Monsters or if that is really all she's got. The P12 is still a powerful, versatile .22 cal in stock form

That is still pretty dang good power though!  Looks like I guessed pretty close again, I said upper 40s,    I bet with a little extra "tuning" it would hit that 50fpe mark no problem.  You need to try some JSB Ultra Shocks in it, I bet those would be nasty on the critters.  I've got a magizine loaded up with some to try with the AT-44 next chance I get, since I did get it sighted in finally. 

[smythsg]

Work and holidays have kept me pretty busy the last couple weeks, but I was able to confirm that the hammer de-bounce does rob some power from the P12, and it will make 50 ft lbs without it. I will leave it on, as it is needed on this gun and I am very happy with the 21 gn Cudas making 40 ft lbs.

[tdmag4life]

I have a MROD-Air  P-12 shooting around 37+ FPE NSA 23g flat base slugs; also likes Varmint Knocker and Griffin 23 -24 flat base. Shoots pretty accurately from upper 20 FPE to nearly 40 FPE.

NSA have a longer "neck" more friction (~ 35 fps slower) than VN or Griffins (prefer VK best) but like price/quanity of NSA now automated.

I've taken several yotes with head shots out to 60 yards

F.Y.I.

[ScottB]

tdmag4life,
How easily do the NSA slugs load in your P12? I have some NSA 17 grain .217 slugs, and when I try to load them the edges of the rifling really dig into the slug, I am not able to load them without forcing them into the barrel. Has your barrel had any work done to allow smooth loading? Thanks.