.25+New Hammer=WooHoo

Yel01zo6 was nice enough to send me a bronze hammer to play with. My .25 with the Walt from Hawaii barrel has been doing great! But she likes using a LOT of air!

I have found that this particular bbl. really likes the new JSB King .25 pellets. Even more so that the .25 Kodiaks. Especially at 80 and futher yards. At 100 yards it is still putting them in there at minute of tree-rat angle. 1 1/2″ consistently, with many groups well under an inch!

The problem has been, they don” seem to like the fps much over 1000 fps. Once they drop below 1000, they are tack drivers. It doesn’t seem to matter much one way or the other with the Kodiaks, BUT—the Kodiaks are great out to 60 or so yards, but they cant’ hold a candle to the JSB’s at longer range in my gun. Teh Kod’s will group at around 2″ at 100 yards, with may groups going 2 1/2″. AT shouter ranges, they do just fine.

When trying to get lower velocity with the factory hammer, the shot string would start at say 1020 and consitently drop from there. Very even though. Only a few fps lost with each shot. But never a bell curve. 20-25 shots, and back to the house for a fill.

Now this is fine for hunting, but there is a lot to shoot at around here in Texas. All kinds of tempiting targets. So I like to hunt, and plink at the same time. Leaving me out of air most of the time.

The new hammer is changing this a bit. So far, it is not quite as consistant, (I’m still learning where to set the tune). But it is comming along well.

I am having to set the gun up a little bet differently. Before the top hat was set at .080, and the power wheel at 8 to 9 to really work well.
this was with teh factory hammer and the extra Condor weight. I figgured the two piece hammer woue cause a little bit of bounce, and wanted to try a solid hammer. The new one is 90 grams. I don’t know what the factory parts come out to.

to get the FPS I was looking for, I had to eventually turn the Top Hat down to .050. Which worries me a bit. I don’t want to damage toe valve!

and supriseingly, the power wheel had to be turned down to 4/10 to get it to the power I was looking for.

What I got in return, was somthing I have never had with teh .25. A nice power curve starting with a very good bell curve. But the curve is climbing rapidly. So more test are required.

Along with finally having a Bell Curve, The .25 really picked up in the shot count. It went from a 20-max of 25 shot count before to 35-40!!! 😯 😀 and doing it with LESS AIR! 1000 psi before, 700-800 with the new hammer. Now thats an improvement that I can live with! WooHoo!!! + even after 40 shots, there are still another crap load of usefull shots if I am willing to use the mil-dots’ to adjust for less velocity. Before, it just dropped like a rock. 🙁

Here are the #’s As always, any advice is more than appreciated!

Mike

2800 fill-.25 Jsb Kings
End pressusre 2100 psi
Top hat .050 wheel at 4/10
21.5 bbl. standard LW twist.

1. 918
928
942
958
967
978
986
994
1000
10. 996
1008
1006
1013
1012
1011
1008
1000
996
991
20. 985
977
974
975
960
959
949
949
950
940
30. 943
930
928
935
920
917
914
906
899
894
40. 887

This is the first full string. I was having trouble getting the max fps under 1025. So far, so good.

Mike