NSA is .178 and HN is .1775 so it makes a big difference in feel. The JSB Ko 13.43gr are .1779 and I can tell a difference between then and the NSA
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N/A .177 for slugs (primarily at least)?!
- Thread starter greenbeans
- Start date
I'm gonna hold off on getting that lead done, until Friday since I won't have to worry about shooting the gun over the weekend. But so far no issue when shooting gridfing 16gr and JSB KO. The issue lies with the NSA 15gr and Griffin 20gr
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Yeah it’s really strange, I’ll try to get a bore scope in there one of these days to check out the transition… and in the end, if the NSA keep their accuracy further out and consistently I don’t care about the spread I guess.
P.S.: U3 supposed to be here Thursday
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Lucky you! Lol.Yeah it’s really strange, I’ll try to get a bore scope in there one of these days to check out the transition… and in the end, if the NSA keep their accuracy further out and consistently I don’t care about the spread I guess.
P.S.: U3 supposed to be here Thursday
I should take my borescope and check the inside of it as well, although I need a better one.
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It takes a day to test your hammer spring setting. Have to make sure you have enough for a little reg creep without having too much and mercilessly pounding the valve.
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Should be tapered and polished some. This is after tapering before polishing. Used a No.1 1 in 48 taper reamer.
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Both are pictures at the end of chamber beginning of throat. You can still see a small edge where the chamber ends and the throat begins. Reamer was used to clean up the chatter marks some then polished. In other words picture one is after a .177 reamer did the chamber, pic 2 is the No 1 taper reamer as it is cutting the throat for a gradual entrance for the slug. I just took the second picture as I was viewing progress. It was not finished yet. Point being pic one is how you can shave lead. Pic 2 is closer to what you want and what your friend will most likely do.
Keep in mind you are looking at a .177 chamber necked down to .172 rifling. This is drastic compared to what your barrels should look like.
Keep in mind you are looking at a .177 chamber necked down to .172 rifling. This is drastic compared to what your barrels should look like.
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I did! It’s nice, very solid. Here they are next to each other! Obviously very similar, stock on the U3 is a little different and fits me a tiny bit better:
Came shooting 22gr at 915-920 but I dialed the hammer back a bit, now shooting 22gr at 895 and 18gr at around 960. Definitely doesn’t feel like balanced valve, reacts to hammer adjustments quite a bit. Reg seems to be sitting somewhere around 105-110, didn’t pull it since I wanted to give it some time. Definitely not enough for slugs but easy enough to adjust. Not sure whether I want to though, look at this:
18gr at 45y (5 shots and the hit low right is was the last shot and I pulled it a bit, the 4 others literally same hole)
18gr at 70y, the “flyer” is on me:
22gr at 70y:
AEA pellets washed, otherwise straight from tin.
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That's awesome dude! My U2 700 .22 was shooting 25gr at 940fps Ave at 125b. The U3 seems way more efficient.
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Yeah it’s really nice! I’ll probably can’t help it a will bump it up one of these days to see how it does with 25gr and some lighter slugs, maybe HN 21gr and something around 25ish gr as well. Easy enough to go back to where it’s sitting right now if I don’t like it
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Good deal! Mine loved HP 2 25gr at 1000fps and hp2 30gr at 935. I'm really diggin the arca railYeah it’s really nice! I’ll probably can’t help it a will bump it up one of these days to see how it does with 25gr and some lighter slugs, maybe HN 21gr and something around 25ish gr as well. Easy enough to go back to where it’s sitting right now if I don’t like it
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Nice!! Yeah the rail is sweet, super solid. Hmmm heavier slugs would be nice but don’t want to have to set the reg crazy high and not sure what I would need to get 30gr north of 900 with the 600mm barrel…
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1/4 turn equals about 100fps increase, along with hammer spring adjustments. I think you may get it done at 130-135b one other member was able to shoot 38.5gr slugs at 880 with reg at 140b
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