325 gr Design for Ballard Remlin

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mtngun
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Re: 325 gr Design for Ballard Remlin

Postby mtngun » Wed Nov 15, 2017 9:05 am

I usually cast COWW at 700 - 725 degrees, but the mold temperature is more important than the pot temperatures. Once the mold is warm enough to fill out, I regulate its temperature by adjusting the time between pours. I guess some people try to speed things up by cooling the mold on a wet pad between pours, but I've never gotten that motivated.

MQ1
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Re: 325 gr Design for Ballard Remlin

Postby MQ1 » Sat Nov 18, 2017 4:53 pm

mntgn,

The boolits feed like butter...looking forward to finishing them up and working out a load. I’ll post my results when I get them...thanks for the help and support.

MQ1

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Re: 325 gr Design for Ballard Remlin

Postby mtngun » Sun Nov 19, 2017 6:30 am

That's great that they feed. :)

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Re: 325 gr Design for Ballard Remlin

Postby MQ1 » Sun Dec 10, 2017 8:21 pm

I had an opportunity to sight in with a couple introductory tests to see if this Marlin has promise and to verify a new front sight will be necessary with the Skinner peep.

All (5) 325 MM boolits made a nice round 1.5” group at 50 yards. The load was a wimpy 40grs of H4895, but it looks very promising to start.

The gas checks come off easy after running through a 432 Lube/Sizer...should I be concerned?

MQ1

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Re: 325 gr Design for Ballard Remlin

Postby mtngun » Mon Dec 11, 2017 8:33 am

MQ1 wrote:All (5) 325 MM boolits made a nice round 1.5” group at 50 yards.

The gas checks come off easy after running through a 432 Lube/Sizer...should I be concerned?

MQ1


Thank you very much for the feedback on the bullets. Glad to hear that they function OK. :)

Gas checks coming off is an annoyance at the loading bench, and possibly a threat to your chronograph. The affect on accuracy is minimal.

Be aware that the check shank is susceptible to "heat shrink" when the mold is too hot. It's a very common problem with heavy bullets, more so with certain alloys. To some extent I try to compensate by making the check shank err on the big side, but I can't cut it too big or else you wouldn't be able to put the checks on.

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Re: 325 gr Design for Ballard Remlin

Postby MQ1 » Sat Dec 30, 2017 9:04 pm

Mtngn,

I had a friend from another sight run some quickload numbers for the 325 mold you made me. Below you will find the data, which I’ll be working from in the near future. H4198 was the best suggested powder:

Cartridge : .444 Marlin
Bullet : .430", 325 gr Custom (0.902")
Useable Case Capaci: 45.522 grain H2O = 2.956 cm³
Cartridge O.A.L. L6: 2.515 inch = 63.88 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Hodgdon H-4198

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-20.0 83 32.80 1659 1986 25066 2576 86.6 1.756
-18.0 85 33.62 1697 2079 26800 2654 87.8 1.707
-16.0 87 34.44 1736 2174 28643 2731 88.9 1.659
-14.0 89 35.26 1774 2271 30603 2805 89.9 1.614
-12.0 92 36.08 1812 2370 32682 2878 90.9 1.571
-10.0 94 36.90 1850 2470 34902 2947 91.9 1.529
-08.0 96 37.72 1888 2572 37249 3015 92.7 1.489
-06.0 98 38.54 1926 2676 39745 3079 93.6 1.451
-04.0 100 39.36 1963 2781 42403 3141 94.4 1.414
-02.0 102 40.18 2001 2888 45236 3199 95.1 1.379 ! Near Maximum !
+00.0 104 41.00 2038 2997 48257 3254 95.8 1.345 ! Near Maximum !
+02.0 106 41.82 2075 3107 51482 3306 96.4 1.312 !DANGEROUS LOAD-DO NOT USE!

MQ1

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Re: 325 gr Design for Ballard Remlin

Postby mtngun » Sat Dec 30, 2017 9:42 pm

Here's what I got with Quickload, assuming a 24" barrel and a 2.540" COL.

40 gr. H4198 (100% fill) = 1980 fps & 43,000 psi
41.3 gr. RX7 (100% fill) = 2037 fps & 43,000 psi
46.5 gr. H335 (100% fill) = 1980 fps & 37,000 psi
41.3 gr. H322 (100% fill) = 1868 fps & 31,000 psi.

LT30 is not in the QL database but I suspect it would work well, too.

Blunt cast bullets hit very hard at 1800 fps, anything faster merely flattens trajectory.


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