reloading / gun / pressure question

[TLMgamecalls]

i have been reloading sence i could shoot
but have never figured this out
(i'll leave it in 30 cal to keep it simple)
a 30-06 operates a 50,000 psi
a 308 operates at 52,000 psi
a 300 win mag at 54,000 psi
all above calibers can be made in a mauser 98 action
(including a 338 win mag)
why couldn't you take the 30-06 to 54,000 psi ?
same bullet types
and still be safe, and gain a little extra power ?

[brokenarrow]

Two immediate reasons come to my mind.

#1 a 300 Win Mag is a "belted" magnum. (Reinforced brass at the base of the cartridge) The 30-06 is not and will result in separation or cracking of the brass at the base.

#2 30-06 rifles are mfg'd in different styles, including semi auto. The bolt action models might be able to deal with the extra pressure but i'd be really afraid someone would, somehow, (after my untimely death, for instance) find one of those hot loads and sling it up in the camber of one of those semi-auto 30-06s and then they might join me in the afterlife.

Aside from that, i dunno. Was this a trick question?

[TLMgamecalls]

well
the belt on a 300 win mag is there because the parent brass at the the time (300 win mag was made from a 300 h & h, which had a very slow neck taper, and there was a need a positive stop, to head space off of)
it was not added to make the 300 win mag brass stronger, just there because of the existing brass used.

[brokenarrow]

ok, i'll stand on #2 as reason enough then.

[TLMgamecalls]

thanks for all your help then

[brokenarrow]

Sorry Bro, I'm sure, as is obvious, you already know more than I do about this subject. I was just thinking out loud. My Dad is the real expert in the family.

This is a rifle he just built. It is a 7mm with a 30-30 chamber. (Yes, he created his own cartridge by necking down a 30-30 to receive a 7mm bullet)

[brokenarrow]

OK, Dude, this is an explanation repeated as best as I can do.

To start with, operating pressure can be increased but, how fast it increases to what point get really deep.

The short answer goes like this...

The 30-06 casing is smaller than the Win Mag. If exactly the same amount of powder is placed in each cartridge and loaded with exactly the same bullet and fired through exactly the same length, bored, and rifled barrels, what will take place is that the pressure in the 30-06 cartridge will build faster with greater internal "shock" than the Win-Mag, due to the "space" difference that is left over inside the casing. The Win-Mag, having greater "space" will allow a cushioning effect of the shock. Thereby lessening the pressure increase rate.

Further recommended study is the "Lee Loading Guide"

Hope this helps a bit

[TLMgamecalls]

here's what i going with
(these were industry standards out of a reloading book)

-cases based on 308 parent brass-short action
7mm-08 =52,000 cup - OAL length 2.8
308 win = 52,000 cup - OAL length 2.81
358 win = 52,000 cup - OAL length 2.78

-cases based on a 30-06 parent brass-long action
25-06 = 53,000 cup - OAL length 3.25
270 win = 52,000 cup - OAL length 3.34
280 rem = 60,000 cup - OAL length 3.33
30-06 = 50,000 cup - OAL length 3.34
338-06 = 53,000 cup - OAL length 3.34
35 whelen = 52,000 cup - OAL length 3.34

now the brass dim. are all close,
(only changed in order to prevent chambering in other guns)
and aside from the ventury (sp) effect, 0n the calibers below 30 cal.
the 06 based cases are all made on the same frames
rem-700, 7600, 7600
win 70, mauser 98
the 30-06 is the lowest presure of the bunch
the why to my question
is is it not posible to bring the 30-06 up to pressure of the other cases in it's class ?

[Randy Wakeman]

tlmgamecalls said:

i have been reloading sence i could shoot
but have never figured this out
(i'll leave it in 30 cal to keep it simple)
a 30-06 operates a 50,000 psi
a 308 operates at 52,000 psi
a 300 win mag at 54,000 psi
all above calibers can be made in a mauser 98 action
(including a 338 win mag)
why couldn't you take the 30-06 to 54,000 psi ?
same bullet types
and still be safe, and gain a little extra power ?

Your pressure information is incorrect.

SAAMI MAP pressures are:

308 Winchester 62,000 PSI
30-06 Springfield 60,000 PSI
300 Win Magnum 64,000 PSI

[TLMgamecalls]

my fault
i used CUP