Cast 550 grain 458 Win Mag

kencolamarino
Posts: 14
Joined: Sun May 29, 2011 11:37 am

Re: Cast 550 grain 458 Win Mag

Postby kencolamarino » Thu Jun 16, 2011 4:09 pm

Dan:

Are the changes acceptable?

Ken

User avatar
mtngun
Site Admin
Posts: 1633
Joined: Fri Feb 01, 2008 5:45 pm
Location: Where the Salmon joins the Snake

Re: Cast 550 grain 458 Win Mag

Postby mtngun » Thu Jun 16, 2011 7:01 pm

Yes, the changes are noted.

kencolamarino
Posts: 14
Joined: Sun May 29, 2011 11:37 am

Re: Cast 550 grain 458 Win Mag

Postby kencolamarino » Thu Jun 30, 2011 2:29 pm

Got the mold last week...great mold. Had a pot of Lyman #2 in a Mold Master XX I was using and couldn't resist. Mold preheated to 425, melt at 750. Only took a few casts to get good bullets. Casting speed put them just on the edge of frosty. OAL of 3.3 as designed. Cast at .462 sized to .460 as expected from #2. First group from a clean gun is picture No. 1 in the diamond. The group under it is round after 40 rounds without cleaning (I forgot the cleaning gear). I was shooting other cast bullets and only loaded 10 of the 28 grain of 2400 for around 1300 with the MM550460. The second picture is 37.5 grains of AA 5744 for around 1500 fps. I'll cronograph when I get the best loads worked out. For a stouter load I'll work with 3031 for around 1900 fps later.

For an out of the gate range session with only 20 rounds loaded, I'm more than happy with the results. I have great hopes for this bullet.
IMG_1715_1.JPG
IMG_1715_1.JPG (80.27 KiB) Viewed 4720 times
IMG_1713.JPG
IMG_1713.JPG (92.1 KiB) Viewed 4720 times
The .460 diameter centers the neck, and neck sized brass centers the cartridge. The 1.3 inch length has the bullet still in the case as the front band centers in the freebore. All that with the .451 bore riding nose and I think I've got a winner. Another project for the summer.

Thanks again for a great mold.

Ken

kencolamarino
Posts: 14
Joined: Sun May 29, 2011 11:37 am

Re: Cast 550 grain 458 Win Mag

Postby kencolamarino » Thu Jun 30, 2011 5:06 pm

The groups were fired at 100 yards from the bench with sandbags, with a Leupold vari x 1.5x5 at 5 power. I really should put a higher magnification scope on it for load development. Both loads used a starch based packing peanut as filler to keep the powder at the primer (yes, it works and reduced SD considerably)

User avatar
mtngun
Site Admin
Posts: 1633
Joined: Fri Feb 01, 2008 5:45 pm
Location: Where the Salmon joins the Snake

Re: Cast 550 grain 458 Win Mag

Postby mtngun » Thu Jun 30, 2011 7:39 pm

Thank you very much for posting your shooting results.

Personally, I think that is very good accuracy considering the leap to the rifling.

kencolamarino
Posts: 14
Joined: Sun May 29, 2011 11:37 am

Re: Cast 550 grain 458 Win Mag

Postby kencolamarino » Mon Aug 01, 2011 1:12 pm

The MM460550 is definitely a winner. 20 for 20 at 300 yards at an 8" gong (25.3 minutes elevation for 100 yard zero) with the 28 grain 2400 load at 1310 fps. Ran a load series using WW 760. 65 grains looked good, and 66 looked really good. Bottom right target is the 65 grain WW 760 load, top left is 28 grain 2400, and top right and bottom left are 66 grain WW760 at 1525 fps.
Attachments
IMG_1717.JPG
IMG_1717.JPG (84.71 KiB) Viewed 4669 times

User avatar
mtngun
Site Admin
Posts: 1633
Joined: Fri Feb 01, 2008 5:45 pm
Location: Where the Salmon joins the Snake

Re: Cast 550 grain 458 Win Mag

Postby mtngun » Mon Aug 01, 2011 1:56 pm

Thank you so much for posting the target results, kencolamarino.

I have to say that I am pleasantly surprised at how well your rifle shoots despite the long jump to the rifling. I would not have predicted the good accuracy.

My 7-30 waters actually shoots its pet low velocity cast load better when they have to jump to the rifling, instead of touching the rifling, so you just never know until you try it.


Return to “General”

Who is online

Users browsing this forum: No registered users and 3 guests