urbanrifleman
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The first targets from a customer. Keith Olson.
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20 Sploder
- Thread starter urbanrifleman
- Start date
What is this cartridge case based off of?
urbanrifleman
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It is a 20-223a zero freebore.
urbanrifleman
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B23
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There's no magic here, it's a simple matter of physics. Given a set parameter, case capacity, you can't get extreme velocity without pressure and you're running zero FB so you aren't gaining any usable case capacity by stretching the bullet out. In fact the zero FB will increase pressure which is exactly what the chronograph is showing you.
Just because the brass or primer isn't showing obvious signs of extreme pressure doesn't mean it isn't present. Again, in a set parameter such as this you can't get one without the other. It's common knowledge the more taper you take out of a case and you square the shoulder off like you've done here by blowing it out to a 40º shoulder it will hide the more obvious signs of pressure. As a gunsmith I'm sure you already know this.
How someone loads their stuff makes no difference to me. Run it and load to as hot as you want I don't care but when you come on a forum and post this kind of stuff with these really high velocities and don't want to recognize those velocities are being obtained because the pressures are extreme, well, I think that's at the least reckless.
Just because the brass or primer isn't showing obvious signs of extreme pressure doesn't mean it isn't present. Again, in a set parameter such as this you can't get one without the other. It's common knowledge the more taper you take out of a case and you square the shoulder off like you've done here by blowing it out to a 40º shoulder it will hide the more obvious signs of pressure. As a gunsmith I'm sure you already know this.
How someone loads their stuff makes no difference to me. Run it and load to as hot as you want I don't care but when you come on a forum and post this kind of stuff with these really high velocities and don't want to recognize those velocities are being obtained because the pressures are extreme, well, I think that's at the least reckless.
That's one of those, "safe in my gun loads" we keep reading about.
urbanrifleman
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urbanrifleman
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Hmmmm...
I shoot 50 grain TNTs in my 223 Ackley at 3850 fps. My brass is going strong.
A 32 grain bullet going that fast is not that shocking to me.
urbanrifleman
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Give me a break...
It is Remington 700 with a stock bolt and firing pin. You can only go so high on pressures before you pierce primers and smoke the primer pockets. Which is not happening.
This is the first person to post data and it is already "reckless".... Man, that is a quick assumption. But hey, I should have expected it.
Maybe his chrono is off, I was really more happy about the small groups.
urbanrifleman
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I have several more 20 Sploders going out so we should have more data soon.
It does appear that Tac shoots quite well. One of my other customers is going to try Tac as well as Exterminator.
It is AT LEAST 200 FPS faster than a 20 Practical (with a 32 grain bullet), as Keith is an experience 20 Practical shooter.
And just so we are clear, I have ZERO experience with 20 cals. I am just posting for others. I made no claims to performance. I just made the reamer and barrels. So, give me a break. I had no idea what to expect.
It does appear that Tac shoots quite well. One of my other customers is going to try Tac as well as Exterminator.
It is AT LEAST 200 FPS faster than a 20 Practical (with a 32 grain bullet), as Keith is an experience 20 Practical shooter.
And just so we are clear, I have ZERO experience with 20 cals. I am just posting for others. I made no claims to performance. I just made the reamer and barrels. So, give me a break. I had no idea what to expect.
B23
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Ahh, so if the brass is strong as hell and can take a shit ton of abuse and "My brass is going strong" that means excessive pressure isn't present. That seems like a real piss poor way to measure pressure but, hey, if it works for you go for it. You may want to give your customers a heads up that this is how you measure pressure. You may want to increase your liability insurance policy too.
urbanrifleman
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Coyotefurharvester
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I was looking at the rifle and the groups.
urbanrifleman
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Like I said I have never done any 20 cal stuff. I had no idea how they shoot. Those are some tiny holes, so they must be pretty close together
The pictures are fixed now. So, no one will blow themselves up by looking at them.
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B23
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If not by increased pressure, how do you explain this physics defying feat of "AT LEAST 200 FPS faster than a 20 Practical (with a 32 grain bullet)" with nothing different except a tiny increase in case capacity?
urbanrifleman
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B23
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Not trolling anything. I'm sorry you're offended by anything I've said but maybe you should do some homework or take some physics classes before you start posting extreme velocities like that or saying things like well my brass is going strong so it must be all good.
urbanrifleman
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