zan boat tail slugs
- Thread starter oldhermit
- Start date
I read on the forum that the app developer, G P Conway, died last year, unfortunately.
The developer of the ancient ChairGun from Hawke Optics is keeping the app from obsolence.
Matthias
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Hello,
Just a quick word on those slugs.
We are testing them already for some time now, or with other words adjusting design to get the best results. Most of the facts you said are true and sometimes bigger is not the best. There are also other things that we need to keep in mind. They will be accurate as normal slugs, stable at longer ranges and should be in full production in around a month. That is we can say now.
The design that you can see is not the final one, it is just the first idea, there were smaller adjustments already made, and some more will be. It is much more fuzzy to design this slug then the normal one.
Have a great day,
Žan
Just a quick word on those slugs.
We are testing them already for some time now, or with other words adjusting design to get the best results. Most of the facts you said are true and sometimes bigger is not the best. There are also other things that we need to keep in mind. They will be accurate as normal slugs, stable at longer ranges and should be in full production in around a month. That is we can say now.
The design that you can see is not the final one, it is just the first idea, there were smaller adjustments already made, and some more will be. It is much more fuzzy to design this slug then the normal one.
Have a great day,
Žan
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SLG1 is actually based on the estimated drag law for a slug with a boat tail and a meplat, so it will not be a perfect fit for a round nosed slug at speeds approaching Mach 1 (1116.5 ft/sec). I did not originally intend it as a reference drag law, but it sort of ended up that way.
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So I did some measuring, the .22 ATP Kings are 5.52 mm at the widest bands, and the boat tail is 2.55 mm. I don't have tools to accurately measure the angle, but it feels shallow, maybe around 5-6 deg.
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Is the second measurement the length of the boat tail or the diameter of the base? I often use photographs taken at the side to get the dimensions and angles of pellets and slugs. It is the method I used to have to use when assessing unfriendly country's large calibre ammunition, though understandably those photographs were not usually of the best quality.
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I don't draw good lol. Long ways, it's 2.55 mm from where the boat tail starts to the base of the slug. I did not measure the diameter of the base... which I should... then I could use my high school geometry to get the angle
So in your pic in post #8, it would be the '.142' dimension, ie slightly less than a half caliber.
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That's good, it would seem to agree with what I was saying.I don't draw good lol. Long ways, it's 2.55 mm from where the boat tail starts to the base of the slug. I did not measure the diameter of the base... which I should... then I could use my high school geometry to get the angle
So in your pic in post #8, it would be the '.142' dimension, ie slightly less than a half caliber.
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I can't speak for the boat tail you're speaking of but, I have shot Zan 43gr? boat tails out of a modified 25 cal Avenger with great results. I have the Zan 357 cal 125gr hollow points are very accurate out of my AEA big 9 long stock .
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