My new MM .433-400 mold.

405 WCF
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My new MM .433-400 mold.

Postby 405 WCF » Sat Jan 10, 2009 3:26 am

Thanks for a perfect mold.

Here is my first test.
First, I loaded up some 350 gr MM bullets at low velocity, around 1700 fps, just to get my rifle sighted in for heavy, low velocity rounds.
I made my rifle go really high at 50 yards with the 350 gr bullet.

I loaded my 400 gr bullets, (402,6gr with lube and gc) with 30 grs Norma 202.
Allso sized the bullets .431

After that I shot one 400 gr round over the chronograph.
1168 fps.
Very slow, and no recoil.

Than I shot the last rounds on the target, (55 yards)
Image

A good start!

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mtngun
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Re: My new MM .433-400 mold.

Postby mtngun » Sat Jan 10, 2009 9:04 am

Thanks for posting the pic. Good shooting !

405 WCF
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Re: My new MM .433-400 mold.

Postby 405 WCF » Sun Jan 25, 2009 3:55 am

The case is closed!
I'm pleased!

Before I was leaving to shot the group, I was going to clean the barrel, becuse, I have not cleaned it since I started with this project.
Well, I searched and I searched, but my boresnake was not to be found.
My loading room is a mess.
But, how is a man supposed to keep his room clean when he is working in the woods all week long, and have a fammily, dogs, hunting, loading shooting to take care of in the weekend's? :roll:
Cleaning is a low priority object! ;)

So, I had to shoot this group without ceaning the barrel.
The group is shot at 110 yards, with the roof of my car as support.
Even if one bullet is a little high and to the left, I'm pretty pleased with the result....

41,5 grs Norma 202 was 1670 fps, (1670,029).
Image

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mtngun
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Re: My new MM .433-400 mold.

Postby mtngun » Sun Jan 25, 2009 7:59 am

Once again, good shooting, and thanks for posting. ! ! ! :D

skunkmarshal
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Re: My new MM .433-400 mold.

Postby skunkmarshal » Sun Jan 25, 2009 10:02 am

Ditto to the excellent shooting! Also, good that you're checking the pressures and approaching the loadup with logic. Watching your thread over on "boolits". While you may be able to get 1800+fps out of it.... I imagine 1670fps with accuracy will do a good job on game given the practical range of the gun/bullet/load.

6pt-sika
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Re: My new MM .433-400 mold.

Postby 6pt-sika » Wed Feb 18, 2009 4:59 pm

Olle was nice enough to offer me a few of his 433-350 and 433-400 bullets .

I tried the 400 grainers with RL7 and Varget choosing to use the max loads Marshall Stanton had for the 405 BTB . And while they were not the greatest in terms of group size they were well within minute of deer , elk or moose . And eventually with a mold and some more bullets I think I can make these shoot just as well in my 444P as any of my other bullets !

6pt-sika
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Re: My new MM .433-400 mold.

Postby 6pt-sika » Wed Feb 18, 2009 5:06 pm

Now this 400 grainer cast from aircooled wheelweights has worked in my 444P with no signs of yaw . But bear in mind the 444P is ballard rifled and the twist is 1/20 .

With my older 444's I have 1/38 twist and Micro groove rifling . So with these for bullets over 315 grains I water quench the wheel weight alloy bullets . And have had excellent results with the NEI429-330GC bullet . This thing weighs 345 grains when it drops from the mold so I am sure the Micro slow twist will handle a 350 grainer .

But I am wondering ? Marshall Stanton said he couldn't get the 400 grainers to stabalize totally at 100 yards without going a bit over the edge so to speak . So I wonder if I were to make a mold like Olle's in 375's grains and water quenched , it should stabalize okay in the slow twist Micro barrels .

Any thoughts or comments ?

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mtngun
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Re: My new MM .433-400 mold.

Postby mtngun » Wed Feb 18, 2009 6:03 pm

Haven't heard of anyone trying a 375 grainer in the slower twist barrel, but that would be "way out there."

I'm still amazed that the 350 grainers shoot in the slow twist.

A 444 Marlin loaded with 300 - 350 grain hard cast should be enough gun for anything in North America ??????? But that's just me.

405 WCF
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Re: My new MM .433-400 mold.

Postby 405 WCF » Fri Feb 20, 2009 6:40 am

First testload with Vihtavuori powder.

QuickLoad said max 39,3 grs VV n130 for 1765 fps.

I started with 37 grs n130, and that load gave me 1775 fps.
But, no bad signs, and the load was very accurate.

Loaded six rounds, three for the chronograph and three for the target.
Range messured with a range finder that my wife brought me for my birthday.
Image

The load was faster than the QuickLoad, so I guess that I stop here.
The bottle I loaded from is allmost empty, ( only powder left for 18 more rounds ) and has not been used since last summer, so maby that is the reason to the high velocity..

Next test will be this load at longer range, just to see how a ballistic program and the reallity compares.
According to my tests, the BC of this bullet is .230.
I will calculate the trajectory with a program, and messure range with my range finder, and shot.

It will allso be very interesting to see how this load group at ranges over 200 yards.

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mtngun
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Re: My new MM .433-400 mold.

Postby mtngun » Fri Feb 20, 2009 8:02 am

Excellent data. That would be a superb elk or moose load for woods hunting.


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