75% rule for 450 Nitro Express

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28 December 2012, 05:43

Double BC

75% rule for 450 Nitro Express

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.

28 December 2012, 06:18

Bill73

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.

28 December 2012, 11:11

cal pappas

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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28 December 2012, 11:43

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?
Kelly.

28 December 2012, 15:25

Bockhunter

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."

28 December 2012, 18:06

degoins

quote:
"It is an great and practical idea."

28 December 2012, 20:57

cal pappas

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

28 December 2012, 21:00

Bill73

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.

29 December 2012, 07:17

cal pappas

I meant to write 2350-2400 fps. Not 4000fps.
Cal

29 December 2012, 09:04

N E 450 No2

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.

29 December 2012, 21:40

Double BC

Tony/Cal,

Thanks for posting the velocities.

Kelly.

31 December 2012, 06:37

470Evans

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.

01 January 2013, 03:12

malek

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

06 January 2013, 07:55

sambarman338

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

06 January 2013, 08:20

cal pappas

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