preventec47

06-07-2010, 02:49

Myself and a friend have been hypothesizing about various potential loadings with some

different powders but for the sake of discussion

we have picked AA#9 as an example.

Following are our measured case capacities

using Federal 10mm cases using a few different

powders we want to play with.

Below are calculated maximum volumes of AA#9

powder using various different length bullets.

1.26" (OAL) - .99" (case length) = 0.27" max bullet protrusion

assume .8” case internal depth

MAX of AA#9 grains w/o compression:

bullet .512 length = percent case capacity 70 - 15.89gr

bullet .55 length = percent case capacity 65 - 14.76gr

bullet .600 length = percent case capacity 59 - 13.39gr

bullet .650 length = percent case capacity 53 - 12.03gr

bullet .700 length = percent case capacity 46 -10.44gr

Weight of a full case of the following powders (Federal Case); without compression

AA 9 =22.7gr

AA 7 =23.6gr

800X =13.6 gr

VV 3N37 =18.5gr

LET ME REPEAT. the above powder weights

are simply the weight of the respective powders

that are poured into an empty case till full

and with the top leveled by scraping off sideways

with a straight edge. This is simply to show

the different powder densities without compression and also provides a basis for

calculations of case capacity remaining after

bullets are inserted.

In the above calculations, I simply calculated the

seating depth of each bullet and subtracted that

from the total case capacity to get a percentage

and then applied that percentage to the

measured full case volume for that particular

powder. I use an assumed internal depth of .8

inches.

I would like to see this msg made a sticky so

more bullet length data can be contributed for

each of the various manufacturers.

10mm Bullet Lengths---------------

( Definitions: solid = non-hollow )

Nosler 135 JHP .494 Inch

Nosler 150 JHP .535 “

Nosler 180 JHP .620 “

Barnes 140gr HP pure copper bullet .682"

Barnes 155gr HP pure copper bullet .732"

Hornady 155 XTP .555 “

Hornady 180 HAP .624 “

Hornady 180 XTP .624 “

Hornady 200 XTP .685 “

Precision Delta 165 FMJ .547"

Precision Delta's Solid 180gr bullet .595 "

Speer #4399 155gr TMJ .538"

Speer #4400 155gr GDHP .540"

Speer #4410 165gr TMJ .555"

Speer #4397 165gr GDHP .580"

Speer #4402 180gr TMJ .600"

Speer #4406 180gr GDHP .630"

Speer #4401 180gr GDHP Short Barrel .630"

( slower velocities for expansion)

XTREME 155gr 512 inch

Remington 155Grn Silvertip, .550 in length

GoldDot HP 155gr .546 in length

different powders but for the sake of discussion

we have picked AA#9 as an example.

Following are our measured case capacities

using Federal 10mm cases using a few different

powders we want to play with.

Below are calculated maximum volumes of AA#9

powder using various different length bullets.

1.26" (OAL) - .99" (case length) = 0.27" max bullet protrusion

assume .8” case internal depth

MAX of AA#9 grains w/o compression:

bullet .512 length = percent case capacity 70 - 15.89gr

bullet .55 length = percent case capacity 65 - 14.76gr

bullet .600 length = percent case capacity 59 - 13.39gr

bullet .650 length = percent case capacity 53 - 12.03gr

bullet .700 length = percent case capacity 46 -10.44gr

Weight of a full case of the following powders (Federal Case); without compression

AA 9 =22.7gr

AA 7 =23.6gr

800X =13.6 gr

VV 3N37 =18.5gr

LET ME REPEAT. the above powder weights

are simply the weight of the respective powders

that are poured into an empty case till full

and with the top leveled by scraping off sideways

with a straight edge. This is simply to show

the different powder densities without compression and also provides a basis for

calculations of case capacity remaining after

bullets are inserted.

In the above calculations, I simply calculated the

seating depth of each bullet and subtracted that

from the total case capacity to get a percentage

and then applied that percentage to the

measured full case volume for that particular

powder. I use an assumed internal depth of .8

inches.

I would like to see this msg made a sticky so

more bullet length data can be contributed for

each of the various manufacturers.

10mm Bullet Lengths---------------

( Definitions: solid = non-hollow )

Nosler 135 JHP .494 Inch

Nosler 150 JHP .535 “

Nosler 180 JHP .620 “

Barnes 140gr HP pure copper bullet .682"

Barnes 155gr HP pure copper bullet .732"

Hornady 155 XTP .555 “

Hornady 180 HAP .624 “

Hornady 180 XTP .624 “

Hornady 200 XTP .685 “

Precision Delta 165 FMJ .547"

Precision Delta's Solid 180gr bullet .595 "

Speer #4399 155gr TMJ .538"

Speer #4400 155gr GDHP .540"

Speer #4410 165gr TMJ .555"

Speer #4397 165gr GDHP .580"

Speer #4402 180gr TMJ .600"

Speer #4406 180gr GDHP .630"

Speer #4401 180gr GDHP Short Barrel .630"

( slower velocities for expansion)

XTREME 155gr 512 inch

Remington 155Grn Silvertip, .550 in length

GoldDot HP 155gr .546 in length