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Pumpkinslinger Super Member
Joined: Sep 22, 2007 Posts: 5002 Location: NC foothills
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Posted: Mon Nov 09, 2009 10:53 am Post subject: Re: New Baby |
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I made an Excel spread sheet to calculate the Greenhill formula as a quick reference. It works to figure the necessary twist if you have bullet diamter and length OR maximum bullet length if you have diameter and twist. I'll be happy to email it to anyone who wants it.
_________________ Mike
"I ain't no better than anybody else, and there ain't nobody better than me!" Ma Kettle |
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tcknight Super Member
Joined: Oct 09, 2009 Posts: 327 Location: Arkansas
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Posted: Mon Nov 09, 2009 7:11 pm Post subject: Re: New Baby |
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gelandangan wrote: |
That alone should stop me from trying something like groovies bullet. |
That's not a bullet. I submit that what you are seeing is a ....
Boat Anchor.
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stovepipe Super Member
Joined: Sep 25, 2008 Posts: 4877 Location: Pine, Az.
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Posted: Tue Nov 17, 2009 2:16 pm Post subject: Re: New Baby |
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Holy canolee...somethin's gonna die.
Bet ya can here the "thunk" in the next zip code when the big boy burns in!
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GroovyJack Member
Joined: May 21, 2005 Posts: 621 Location: Bama
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Posted: Tue Nov 17, 2009 3:22 pm Post subject: Re: New Baby |
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well NEI lied about this one fellas , sposed to be a 458 645 grain with GC .. I jus weighed 35 of them and they run about 730 in WW
_________________ My Goal In Life Is To Be As Good Of A Person As My Dog Already Thinks I Am |
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stovepipe Super Member
Joined: Sep 25, 2008 Posts: 4877 Location: Pine, Az.
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Posted: Tue Nov 17, 2009 3:25 pm Post subject: Re: New Baby |
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Wow.
Ok, now what? That's a giant chunk of lead!
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GroovyJack Member
Joined: May 21, 2005 Posts: 621 Location: Bama
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Posted: Tue Nov 17, 2009 3:55 pm Post subject: Re: New Baby |
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now what ?? hopefully a range day soon ..
_________________ My Goal In Life Is To Be As Good Of A Person As My Dog Already Thinks I Am |
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stovepipe Super Member
Joined: Sep 25, 2008 Posts: 4877 Location: Pine, Az.
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Posted: Tue Nov 17, 2009 3:57 pm Post subject: Re: New Baby |
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Copy that, big baddaboom, comin' right up!
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Vince Site Admin
Joined: May 25, 2005 Posts: 15715 Location: Brisbane AUSTRALIA
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Posted: Wed Nov 18, 2009 12:16 am Post subject: Re: New Baby |
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GroovyJack wrote: |
well NEI lied about this one fellas , sposed to be a 458 645 grain with GC .. I jus weighed 35 of them and they run about 730 in WW |
When you think about that Groovy, it's actually a bit scary. The difference between the advertised weight and the actual weight is 85 grains. When you consider the extra pressure that could be generated it's not hard to see how a gun could blow up.
Luckily you were smart enough to weigh your boolits...I'll lay odds that there are plenty out there that wouldn't bother, and simply accept the advertised weight.
Cheers, Vince
_________________ Cheers, Vince
Illegitimi non carborundum
(Never let the bastards grind you down)
Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God.
"Nulla Si Fa Senza Volonta."
(Without Commitment, Nothing Gets Done) |
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Pumpkinslinger Super Member
Joined: Sep 22, 2007 Posts: 5002 Location: NC foothills
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Posted: Wed Nov 18, 2009 12:34 am Post subject: Re: New Baby |
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May I repeat... Holy cow! I think I'd double check with NEI on that one.
_________________ Mike
"I ain't no better than anybody else, and there ain't nobody better than me!" Ma Kettle |
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GroovyJack Member
Joined: May 21, 2005 Posts: 621 Location: Bama
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Posted: Wed Nov 18, 2009 1:20 am Post subject: Re: New Baby |
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Pressure with casts isnt "much" an issue as with jacketed tho' Vince .. Most starting loads for casts , are around 60% of the starting load for a jacket of the same weight ..
My secret , with cast , has always been to use a powder too slow for the caliber with jacketed ( if I want a full case or nearly so of powder ) ..
Got some ideas where to start with it , we will see soon ..
_________________ My Goal In Life Is To Be As Good Of A Person As My Dog Already Thinks I Am |
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stovepipe Super Member
Joined: Sep 25, 2008 Posts: 4877 Location: Pine, Az.
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Posted: Wed Nov 18, 2009 8:09 am Post subject: Re: New Baby |
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Vinny make's a great point.
Scale's are cheap, guns (and body parts) aint!
Man that's a big difference.... and big bullet!
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POP!! Member
Joined: Dec 02, 2005 Posts: 269 Location: Cheyenne, Wy
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Posted: Thu Nov 19, 2009 10:37 pm Post subject: Re: New Baby |
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Jack here is my favorite.
700 grain cast for my 500 S&W pistol.
With some lilgun I get 1230 fps. Here is Stephan my 13 year old shooting it.
_________________ FOTIS |
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gelandangan Super Member
Joined: May 07, 2006 Posts: 6397 Location: Sydney Australia
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Posted: Thu Nov 19, 2009 11:15 pm Post subject: Re: New Baby |
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WOW 2 1/4 inch cartridge shot by hand!!!
Either thats not much of a recoil, or your son has got the grip right.
I think it is the second option.
The boy definitely do not move at the time he pull the trigger!!
Good job!!
_________________ A straight line is the shortest distance between two points.
A smile is the shortest distance between two people.
Do - Not try!
gelandangan.weebly.com/ |
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POP!! Member
Joined: Dec 02, 2005 Posts: 269 Location: Cheyenne, Wy
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Posted: Thu Nov 19, 2009 11:34 pm Post subject: Re: New Baby |
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He is a trooper for sure. This was his second antelope this year.
270 Win 130 gr Ballistic tip at 3050 fps. 249 yards. DRT
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GroovyJack Member
Joined: May 21, 2005 Posts: 621 Location: Bama
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Posted: Sun Nov 22, 2009 10:34 pm Post subject: Re: New Baby |
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Hey poopie , what's up ???
Where you been ??
Reckon the job here aint happening huh ??
My brother has a 500 Smiff , is a handful ..
Hope ta get to the range after Thanksgiving with these puppies ..
_________________ My Goal In Life Is To Be As Good Of A Person As My Dog Already Thinks I Am |
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