Case volumes 300 wm

[terry g melancon]

Hey y'all, I'm Terry from central Louisiana.
Anyway, I have been handloading for about 20 years. I have always weighed my cases..
But with my 300wm I thought I would check the capacity with water instead of weight.
I tested once fired hornady, federal and Remington. They were all the same. About 5.8m.
If the capacities are the same , shouldn't the pressures be the same ?
I have always read remington brass had less capacity. I dont see it . Any comments would be appreciated, thanks !!

 

[ar10ar15man]

i am surprised at the similar volumes.
to be clear, insert a spent primer upside down, weigh and record the weight.
fill with water at about 75 degrees, tap to remove bubbles, us the edge of a tissue to get the water flat at the top of case(MENISUS)
weigh and subtract that is aprox case vol.
i do not know what 5.8m is

 

[ShtrRdy]

Welcome to the forum! How many cases did you measure volume on? Were they all fired in the same rifle?

 

[terry g melancon]

Yes all fired from same rifle. I guess using ml lines on seringe isn't precise enough. One ml is over 15 grains. But I did weigh the brass. Hornady and Remington were about 234 to 237 grains. If I remember correctly. Federal was about 249 grains. Federal surprised me. I figured Remington would be heavier.
With federal brass I get .3 to .5 groups at 100 yes. 215 bergers. 76.3 g h1000. Avg 2960.
I thought 2960 was a fast for the load as compared with everything else I read. Checked it again with second chrony. Same velocity.
Still seems high for 24 inch savage stealth.
Maybe thicker brass ? I also lap the barrel.
Also the stealth uses the same magazine for the 300 and 338 lapau. So I can seat the bullets way out.

 

[terry g melancon]

i am surprised at the similar volumes.
to be clear, insert a spent primer upside down, weigh and record the weight.
fill with water at about 75 degrees, tap to remove bubbles, us the edge of a tissue to get the water flat at the top of case(MENISUS)
weigh and subtract that is aprox case vol.
i do not know what 5.8m is

i am surprised at the similar volumes.
to be clear, insert a spent primer upside down, weigh and record the weight.
fill with water at about 75 degrees, tap to remove bubbles, us the edge of a tissue to get the water flat at the top of case(MENISUS)
weigh and subtract that is aprox case vol.
i do not know what 5.8m is

Ok thanks. I guess using mils / grams isn't precise enough. Probably need an electronic scale to weigh brass with water.

 

[ar10ar15man]

a PRECISE scale. a beam is better than a cheap electronic.
a cc is essentially a gr at 77 degrees...not10 for 15

 

[terry g melancon]

Ok I have a beam. I read 1 m.l. was equal to 1 gram. My measurments were 5.8 m.l..
About 89 grains of water.
I know it was correct but I really wasn't that for off. Lol

 

[Heavyiron]

Welcome to LRH. Great to have you on board.