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75% rule for 450 Nitro Express
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Hello,

Just wondering what guys here have loaded a 350-360 grain bullet in the 450 nitro, over full house loads for use on smaller game? From what iv e read it will get you close to regulation.
What was the velocity?
How much less recoil?

Thanks.
 
Posts: 373 | Location: British Columbia | Registered: 13 April 2012Reply With Quote
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I do not load for a 450 nitro,but do reload for a 470 & a 458 lott DR,I have loaded the 350 in the lott & also a lighter bullet in the 470,the lighter bullets will regulate well,but probably take a few less grains short of the full house loads,for example,my 470 takes 87 gr of Rx15 with a 500 gr bullet & 84 gr with a 400 gr bullet to shoot to regulation,recoil is also substantially reduced,I have shot a lot of warthogs & pigs using the lighter bullets,they work great.


DRSS
 
Posts: 2283 | Location: MI | Registered: 20 March 2007Reply With Quote
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DoubleBC:
In my .450 no2 I shoot 350-grain Hornady bullets and they regulate fine. I do the same with 300-grain bullets in my .450-400. The rule will also work with a full weight bullet and 75% of powder although I've heard not quite as accurate. When spring is here I will experiment a great deal with this second option.
Cheers,
Cal


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Cal Pappas, Willow, Alaska
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www.CalPappas.blogspot.com
1994 Zimbabwe
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1999 Zimbabwe
1999 Namibia, Botswana, Zambia--vacation
2000 Australia
2002 South Africa
2003 South Africa
2003 Zimbabwe
2005 South Africa
2005 Zimbabwe
2006 Tanzania
2006 Zimbabwe--vacation
2007 Zimbabwe--vacation
2008 Zimbabwe
2012 Australia
2013 South Africa
2013 Zimbabwe
2013 Australia
2016 Zimbabwe
2017 Zimbabwe
2018 South Africa
2018 Zimbabwe--vacation
2019 South Africa
2019 Botswana
2019 Zimbabwe vacation
2021 South Africa
2021 South Africa (2nd hunt a month later)
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Posts: 7281 | Location: Willow, Alaska | Registered: 29 June 2009Reply With Quote
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Bill/Cal

Thank you for the replies, Very honoured.
Im wondering what the increase in velocity i so I can calculate trajectory.
Partially because im a bit nuts and over think things, but Im thinking why get a 450 400 or 375 when I can get a 450, load it down for NA game. Fire a 350 gr bullet at reasonable velocity. Maybe even put QD mounts on it for the reduced loads? Have my cake and eat it too.

What do you think?
Kelly.
 
Posts: 373 | Location: British Columbia | Registered: 13 April 2012Reply With Quote
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quote:
What do you think?

If you can do it in the way you wrote, I would say: "It is an great and practical idea."


 
Posts: 866 | Registered: 13 March 2011Reply With Quote
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quote:
"It is an great and practical idea."


+1


DRSS
 
Posts: 1175 | Location: Pamplico, SC USA | Registered: 24 August 2005Reply With Quote
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I have all of my shooting info packed away to make room for my shipment of Bore Rifle books so I can't give an exact velocity. Memory tells me a 350-grain from my .450 no2 with 105 grains of IMR 4831 was 2350-4000 fps.
cheers,
Cal


_______________________________

Cal Pappas, Willow, Alaska
www.CalPappas.com
www.CalPappas.blogspot.com
1994 Zimbabwe
1997 Zimbabwe
1998 Zimbabwe
1999 Zimbabwe
1999 Namibia, Botswana, Zambia--vacation
2000 Australia
2002 South Africa
2003 South Africa
2003 Zimbabwe
2005 South Africa
2005 Zimbabwe
2006 Tanzania
2006 Zimbabwe--vacation
2007 Zimbabwe--vacation
2008 Zimbabwe
2012 Australia
2013 South Africa
2013 Zimbabwe
2013 Australia
2016 Zimbabwe
2017 Zimbabwe
2018 South Africa
2018 Zimbabwe--vacation
2019 South Africa
2019 Botswana
2019 Zimbabwe vacation
2021 South Africa
2021 South Africa (2nd hunt a month later)
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Posts: 7281 | Location: Willow, Alaska | Registered: 29 June 2009Reply With Quote
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quote:
Originally posted by Double BC:
Bill/Cal

Thank you for the replies, Very honoured.
Im wondering what the increase in velocity i so I can calculate trajectory.
Partially because im a bit nuts and over think things, but Im thinking why get a 450 400 or 375 when I can get a 450, load it down for NA game. Fire a 350 gr bullet at reasonable velocity. Maybe even put QD mounts on it for the reduced loads? Have my cake and eat it too.

What do you think?

That is a great idea & the perfect caliber for it,I love playing with my Lott O/U,because there are so many choices for bullets available,my longest shot was about 250 yards,shot a pig with swift A frame 400 grs going about 2200 fps.
Kelly.


DRSS
 
Posts: 2283 | Location: MI | Registered: 20 March 2007Reply With Quote
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I meant to write 2350-2400 fps. Not 4000fps.
Cal


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Cal Pappas, Willow, Alaska
www.CalPappas.com
www.CalPappas.blogspot.com
1994 Zimbabwe
1997 Zimbabwe
1998 Zimbabwe
1999 Zimbabwe
1999 Namibia, Botswana, Zambia--vacation
2000 Australia
2002 South Africa
2003 South Africa
2003 Zimbabwe
2005 South Africa
2005 Zimbabwe
2006 Tanzania
2006 Zimbabwe--vacation
2007 Zimbabwe--vacation
2008 Zimbabwe
2012 Australia
2013 South Africa
2013 Zimbabwe
2013 Australia
2016 Zimbabwe
2017 Zimbabwe
2018 South Africa
2018 Zimbabwe--vacation
2019 South Africa
2019 Botswana
2019 Zimbabwe vacation
2021 South Africa
2021 South Africa (2nd hunt a month later)
______________________________
 
Posts: 7281 | Location: Willow, Alaska | Registered: 29 June 2009Reply With Quote
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My 75% loads for the 450 No2 and the 450/400 3 1/4" [using the full load of powder the rifle regulates with the standard weight bullet], I get @2330fps in the 450 No2 with the 350gr Hornady, and in the 450/400 3 1/4" with 300gr Hawks I also get @2330fps.

My 75% rule, refers to using a bullet that weighs @75% of the normal standard full weight bullets with the same powder charge you use for full power loads, give or take a grain of two depending on the particular double.


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Posts: 16134 | Location: Texas | Registered: 06 April 2002Reply With Quote
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Tony/Cal,

Thanks for posting the velocities.

Kelly.
 
Posts: 373 | Location: British Columbia | Registered: 13 April 2012Reply With Quote
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I load my 500/450 Holland Royal with 350 gr Hornady Round Nose bullets with the same charge of R-15 as the 480 gr Woodleighs and it shoots to the same POI at about 2300fps.
 
Posts: 1312 | Location: Texas | Registered: 29 August 2006Reply With Quote
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Should this work the same for the 9.3x74R with the 235 or 250 weight bullets?

Happy new year

Malek
Good shooting/hunting and God's best


Best regards

Malek
Good Hunting/Shooting and God's best.
 
Posts: 812 | Location: Charlotte, NC | Registered: 25 December 2010Reply With Quote
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quote:
Originally posted by cal pappas:
The rule will also work with a full weight bullet and 75% of powder although I've heard not quite as accurate. When spring is here I will experiment a great deal with this second option.
Cheers,
Cal


That concept appeals to me, Cal, but does it assume the powder is pretty fast-burning? To do it with 4831 (a popular powder with some db-rifle handloaders) would seem to take us into dangerous territory.

Regards
- Paul
 
Posts: 5188 | Location: Melbourne, Australia | Registered: 31 March 2009Reply With Quote
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Sambarman338:
Good day. I use a hot primer and a filler with reduced powder charges of 4831 to keep the powder next to the primer for good ignition and have no problems, no hang fires, etc... I can only speak from my experience. I will do extensive shooting in the summer and will file a report with the AR folks here as to accuracy and velocity.
Cheers,
Cal


_______________________________

Cal Pappas, Willow, Alaska
www.CalPappas.com
www.CalPappas.blogspot.com
1994 Zimbabwe
1997 Zimbabwe
1998 Zimbabwe
1999 Zimbabwe
1999 Namibia, Botswana, Zambia--vacation
2000 Australia
2002 South Africa
2003 South Africa
2003 Zimbabwe
2005 South Africa
2005 Zimbabwe
2006 Tanzania
2006 Zimbabwe--vacation
2007 Zimbabwe--vacation
2008 Zimbabwe
2012 Australia
2013 South Africa
2013 Zimbabwe
2013 Australia
2016 Zimbabwe
2017 Zimbabwe
2018 South Africa
2018 Zimbabwe--vacation
2019 South Africa
2019 Botswana
2019 Zimbabwe vacation
2021 South Africa
2021 South Africa (2nd hunt a month later)
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Posts: 7281 | Location: Willow, Alaska | Registered: 29 June 2009Reply With Quote
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