New Baby

Pumpkinslinger · Posted: Mon Nov 09, 2009 10:53 am Post subject: Re: New Baby

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.

tcknight · Posted: Mon Nov 09, 2009 7:11 pm Post subject: Re: New Baby

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.

stovepipe · Posted: Tue Nov 17, 2009 2:16 pm Post subject: Re: New Baby

Holy canolee...somethin's gonna die.

Bet ya can here the "thunk" in the next zip code when the big boy burns in!

GroovyJack · Member Joined: May 21, 2005 Posts: 621 Location: Bama

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

stovepipe · Posted: Tue Nov 17, 2009 3:25 pm Post subject: Re: New Baby

Wow.

Ok, now what? That's a giant chunk of lead!

GroovyJack · Member Joined: May 21, 2005 Posts: 621 Location: Bama

now what ?? hopefully a range day soon ..

stovepipe · Posted: Tue Nov 17, 2009 3:57 pm Post subject: Re: New Baby

Copy that, big baddaboom, comin' right up!

Vince · Posted: Wed Nov 18, 2009 12:16 am Post subject: Re: New Baby

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

Pumpkinslinger · Posted: Wed Nov 18, 2009 12:34 am Post subject: Re: New Baby

May I repeat... Holy cow! I think I'd double check with NEI on that one.

GroovyJack · Member Joined: May 21, 2005 Posts: 621 Location: Bama

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 ..

stovepipe · Posted: Wed Nov 18, 2009 8:09 am Post subject: Re: New Baby

Vinny make's a great point.

Scale's are cheap, guns (and body parts) aint!

Man that's a big difference.... and big bullet!

POP!! · Posted: Thu Nov 19, 2009 10:37 pm Post subject: Re: New Baby

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.

gelandangan · Posted: Thu Nov 19, 2009 11:15 pm Post subject: Re: New Baby

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!!

POP!! · Posted: Thu Nov 19, 2009 11:34 pm Post subject: Re: New Baby

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

GroovyJack · Member Joined: May 21, 2005 Posts: 621 Location: Bama

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 ..