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Old July 23, 2017, 11:21 AM   #26
Tinbucket
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Do you think cases that large and with that much capacity would benefit from a tube from primer to front and 2 or three different powders for progressive burn?
I'm brain dead this morning and can't think of the term for this.
It should give nice increase in velocity and cooler longer barrel life.
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Old July 23, 2017, 01:36 PM   #27
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Elmer Keith experimented with tube primers and the results were good, but apparently not favorable enough to prompt any ammo company to pick the idea up and run with it.

Using two powders in a cartridge (usually with a faster burning powder over a slower burning powder) is called a duplex load. I suppose a triplex load would be the same thing with three powders.
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Old July 23, 2017, 02:33 PM   #28
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I messed with it in my Weaatherby .270. A lot of trouble but above 4400fps with 90 grain Speer which vaporized and the cases normal or redone only, three times to four times with annealing.
Military artillery rounds, some of them use or used this. Holes on the sides of tube also changed burning powder characteristics. Real slow powders , I think, necessary over .50 BMG could possible leave unburned powder from such massive charges, which that might solve, was my thought. I paid over 280.00 I think for 8lbs of powder for 223 CF I think. I can't imagine you cost for powder with near 300 grains loadings.
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Old July 24, 2017, 11:16 PM   #29
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Is anyone using a 20mm rifle for the competition?

It would definitely have the power to reach out that far and then some. There are a couple companies that are making them, any info?
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Old July 30, 2017, 07:32 PM   #30
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Would the total weight of a 20mm rifle be less than 50 lbs ?

Since that is mostly one of the requirement in ELR
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Old September 17, 2017, 10:18 AM   #31
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Never heard of one lighter...

Here is case measurements for our 416 HE target case
made from our 585 HE big belted case. Ed



Here is picture of 375 HE left, 416 HE next, 416 HSM right..



Here, tentative specs, 416 HSM case we are doing from bmg brass,



A 375 HE, with Lawton action, bunch being done with those .....

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Old October 9, 2017, 07:36 PM   #32
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Here is a 375 HE target gun set up, by Asteroid Precision...




Here is video of it being tested... And with a 350gr bullet about 3450-3475,

bolt opened easily with one finger...And he's just getting started

and is checking on better powder, Ed...........



https://www.facebook.com/AsteroidPrecisi..._location=group
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Old November 17, 2017, 02:29 AM   #33
HUBEL458
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Here is recap simple setup to get faster loads with 12ga sabots

& slugs, Example using break actions...., reaming chamber

in a 12ga break action to 3.5" with a 3.5" 12ga reamer, that isn't

something needing special order, and use 3.5" plastic cases , or

get 3.5" brass cases made. With mag shotgun primers and

our slower powder loads you can get a quarter more speed,

which gives 50% more energy...


585 Hubel Express video, 190ft/lbs recoil, heavy load, gun little light.....

https://www.youtube.com/watch?v=tyS9zZ8ElJA


Another view of Asteroid Precision's.... 375 HE target gun,




Here is our 416 HSM we are developing next to 416 Barrett, Ed

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Old November 23, 2017, 07:27 PM   #34
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Here in picture of the cases, are shown the steps in making

our 416 HSM case, from BMG brass,, Ed

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