.284
6-5-06
6.5-06 Improved
7mm Rem SAUM
300WSM

I was hoping maybe someone could get the info from Quickload or a manual as I do not have any literature that gives these specs. This would be a great help to me in a current project.

Keep your lines wet and your powder dry.

.284: 64.59
6.5/06: n/a, 2506 is 65.03
6.5/06 imp: n/a. Minimal enlargement, I suppose
7 Rem Mag: 83.19
300 WSM: n/a

HTH, Dutch.

Full case capacities upto top of neck.

.284 Winchester--------------64.59 water grains
6.5-06 Springfield-----------62.82
6.5-06 Ackley Imp.-----------66.93
7mm Rem Ultra Mag.-----------111.3
.300 Winchester Short Mag----83

The 7mm Rem U.M. and .300 Winchester Ultra Mag are calculated values determingd by inputting case diameters and there could be some slight variation from Remingtons and Winchesters published values. However, taking into account the variations in internal volumes of cases from other manufacturers, the values should be adequate.

The net case capacities vary depending on whose bullet is seated and it's length.
________________

Kendall

We still haven't done much. As noted in a previous post, the case volume available for gunpowder (Va) is a function of the bullet volume (Vb) seated in the case. Vb depends on the length of the bullet (Lb), the overall length of the cartridge (COL), and the trimmed length of the cartridge case (Lc).

(Eq. 1) Hence: Seating depth (SD) = Lb - (COL - Lc).

(Eq. 2) Hence: Vb = * x r x r x SD Where r = 1/2 the bullet diameter.

(Eq. 3) Hence: Va = Vt - Vb cu. in.

Using the 284 Winchester example and a Hornady 120 gr. JSP (flat base) bullet (Lb = 1.14 in.) and Hornady case dimensions (COL = 2.950, Lc = 2.160):

(Eq.1) and (Eq.2) result in Vb = 0.022 cu. in.

(Eq. 3) results in Va = 0.233 cu. in.

If IMR 3031 is the selected gunpowder, with a bulk density of 220 gr./cu. in., a charge weight (Wc) of 51.3 gr. results in 100% Fill (Wc = BD x Va).

A modicum of validity is offered for this approach by referring to published data for nearly identical conditions. Hornady shows a charge weight (Wc) of 48.0 gr. getting a muzzle velocity (MV) of 3100 feet per second (fps); Speer 51.0 gr. = 3154 fps MV; and Lyman shows 2932 fps MV with 45.0 gr. Calculating MV per grain weight of gunpowder, the respective values become 64.6 fps/gr.,61.8 fps/gr., and 65.2 fps/gr. The differences are within expections considering the more than probable variations in the test procedures and cartridge configurations used by each producer.

It is also observed that the muzzle energy (E) per grain weight of gunpowder (E/gr.) factor is 53.5 ft-lb/gr., 52.1 ft-lb/gr., and 51.1 ft-lb/gr. respectively; again within expectations.

So... does all this "glop" mean anything? ("glop" being defined as the result of [bleep] hitting the fan.) Well, not really. But it does show that we can estimate useful data using information available to all of us to simply answer questions that our publications and softwares do not answer. Wildcat cartridges, the newer cartridges with limited available data, and the older black-powder cartridges converted to modern gunpowders come to mind.

With respect to volume, 0.001 cu. in. sounds like a very small, insignificant amount. However, the number represents a cube 1/10 inch per side. Not a comfortable thing to have in one's shoe. Given that 1/10 the cube can hold maybe nine tubular granules of gunpowder weighing maybe 0.3 gr., the small number becomes important as we approach maximum pressures.

Your patience is appreciated.

Good shooting.

Robert

quote:

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Originally posted by bobshawn:
First, grain weight (gr.) of water is not a measure of volume. A helpful conversion factor is: 1.0 gr. H2O = 0.00395 cubic inches (cu. in.).

---

A very interesting quote. My wife claims to have been useing 'fluid ounces' (volume of one ounce of water) for a volume measurement for many years. Best I not tell her she can't do that unless I wish to do my own cooking.

Further, this is the first claim that I have heard that you can convert a non-volume measurement to a volume measurement? I would think it possible to convert grains of water (ie. fluid grains) to cubic inches only if both were the measurement of the same thing.

JerryO

This becomes readily apparent in the metric system ( which is the official USA standard of measurement ) where 1 liter of water weighs one kilogram.

Kendall

------------------
Ray Atkinson

ray@atkinsonhunting.com
atkinsonhunting.com