.22 transfer port sizes?

[mcoulter]

Nice work!  I think it is time to test it with the Barracuda Match and Monster Redesigned now

Thanks!  And yes I'm itching to test the redesigned monsters.  I have about one half  tin left of them.  No barracudas though.  Can any other kral owners comment on how H&Ns shoot for you?

Oh yeah...  I can also hear my drill press saying "come hither..."  to my Hatsan Flash...   

[Rallyshark]

Nice work!  I think it is time to test it with the Barracuda Match and Monster Redesigned now

Thanks!  And yes I'm itching to test the redesigned monsters.  I have about one half  tin left of them.  No barracudas though.  Can any other kral owners comment on how H&Ns shoot for you?

Oh yeah...  I can also hear my drill press saying "come hither..."  to my Hatsan Flash...   

I'm betting it will love the BM.  I would try the 5.51 head size.  It may turn out to be your most accurate pellet.

I can't remember if you saw the end results, but I got the .177 Flash over 40fpe   I think it topped out at around 42fpe.  I can't wait to see what it will do when I get the 20" polygon mounted

[mcoulter]

Yes, I remember your work on the flash but I couldn't find the thread.  Could you post it PM me the link?  I'd love to read through it again.

Thanks!

[mcoulter]

I finally got an opportunity to sling some JSB Redesigned Monsters (25.4 grain) after opening up the ports.  The Bigmax was shooting them at 820 fps (just about 38 fpe) and was shocked at how well they performed with the way the winds were howling this evening...  I have also been enjoying my AliExpress chrony.  What a treat it was to able to use a chrony in the evening and get readings :-) !

I found that with tripod that has a head that angles 90-degrees I can shoot though it without my view being obstructed  :-)





Right group was the close sight-in and the left is 10-shots at 50 yards  :-)



(I moved this post here from another kral thread where I had accidentally posted it...)

[Rallyshark]

The redesigned Monsters really do well in a lot of guns.  Nice shooting!  Have you tried the Barracuda Match yet?  That tune you have would be perfect for them.  That's a nifty little chrony thingy too.

[mcoulter]

The redesigned Monsters really do well in a lot of guns.  Nice shooting!  Have you tried the Barracuda Match yet?  That tune you have would be perfect for them.  That's a nifty little chrony thingy too.

Nope, I don't have any Barracuda Match pellets right now.  But I'll get a tin or two as part of my next pellets order.

The "AliChrony" has so far exceeded expectations. You just have to deal with converting meters per second to feet per second.

 Thanks!   

[mcoulter]

I finally shot a long string (130 shots) after opening up the transfer ports on the kral bigmax.  I used JSB 18s pellets and I started with a 210 bar fill and shot down to 135 bar.  I realize that this will be hot with 18s and may not be best for accuracy, but I really wanted to see how these larger ports affected the string...

Extreme spread 38 fps (4%)
FPS 933 (average) / FPE 35 (average)




And to get it within 2% I would need to start at 2820 psi / 194 bar (around shot 27) and end just a bit sooner at 2025 psi / 140 bar (around shot 122).

What's interesting is the efficiency.  In earlier strings the best I got was .96.  But more were  like .67 to .70.   It jumped up here to 1.18.  Still not great, but better.

Accuracy with the 18s was not great at this speed.  Here are all 130 shots (in 10-shot groups) at 50-yards:








It's NOT all all bad in the accuracy department though.  Like before, JSB Mosnters (redesigned) are still the best pellets I've tested.  Here are some more 10-shot groups at 50 yards.







I did get some H&N Baracudas.  Here's a combination of them (left & top-middle).  CPHPs on the right and yup, monsters bottom-middle. 




Monsters were shooting at 810 fps to 820 fps.  The h&ns were shooting 885 fps to 890 fps. CPHPs were shooting 1015 fps to 1020 fps.  Next up will be testing the power adjuster to see exactly what velocity the 18s like to be shot at...  And doing a full string with the monsters  :-)

[Rallyshark]

Looks like the Monsters are the way to go for accuracy for sure.  I'm surprised the BM didn't do better.  What head size did you use?

[mcoulter]

Looks like the Monsters are the way to go for accuracy for sure.  I'm surprised the BM didn't do better.  What head size did you use?

They're 5.51mm.  I'll definitey shoot more of them after a good barrel cleaning  :-)

[Rallyshark]

Hey, it just may not like them.  Of course, there are other head sizes to try too.  I've had guns that shot the 5.51 great, but 5.52 was all over the place,lol.  There are so many different choices in ammo in .22, so I'm sure you'll find the ones it likes the best

[skorec]

Matt ,
Veeeeeery Nice/important info/pictures and shooting groups at this project. To avoid porting size problems I was planning to by Puncher NP-02 at calibre .22 for using at .177 barrel because at my .177 Puncher maxi the  size at block is smaller .


Just now I am thinking to buy NP-02 at calibre .177/4,5mm and use the 3,8 mm drill to enlarge the holes.

May be many sizes are the same at .22 and .177 ?

    .22/5,5mm                                   .177/4,5mm
valve = 3.7 mm                                   3.7mm ?
power wheel = 3.46 mm (0.136 in)       3.46mm ? 
block = 4.05 mm (0.159 in)                  4.05mm ?
barrel = 3.8 mm                                   3mm ?