Hi
when trying to follow reloading data, each company is using case from differnt type of makers . one is rem ,other is fedral , third win, norma, lapua etc. can i use those data using for exemple rem case which i have instead of win or fedral? i don't own advanced mesuering device to see the difference between them.
regards
Y E S

Well, three little things to think about...

1)Not only does the case capacity differ between makers, but also between lots;

2)If you start with a load below "maximum" (as you are supposed to do) and work up gradually, then the case capacity doesn't come into effect;

3)All you need to measure case capacity is water, and eye dropper and a powder scale. (Not very exotic equipment).

There is a noticeable difference in capacity between commercial and military brass, and between American brands and Norma. In my experience, Norma requires 1-2 grains less powder to reach the same pressures as Remington.

Yes,

As mentioned above , the case capacity can be measured easily with a scale and something you can weigh in the case.

I am less picky, and instead of water use a fine grained powder ( whatever happens to be handy ).

This gives me a More/Less indication and can even be used without the scale ( by pouring powder from one case into the other ) to get a rough idea as to whether one brand holds more than another.

I would not base any complicated mathematical calculations on any method of case capacity measurement, real world milage may vary.

Weighing brass also can tell you about the same thing, heavy brass holds less powder.


Travis F.

Remington brass is usually thicker-walled than Winchester, so Winchester brass usually will hold more powder than Remington.

But I stress the "usually" -- you should not conclude anything about any particular case or lot of cases on the basis of that overall assessment.

quote:

I would not base any complicated mathematical calculations on any method of case capacity measurement, real world milage may vary.Travis F.

Travis

Case capacity is the first requirement of all ballistic and load programs as far as I know.

Ray

I load for a wildcat that is a little shorter than the 338-06 but when I measured case capacity between the 338-06 and the wildcat, the shorter case came up holing more both times I checked. Then it hit me and I checked the headstamp and the smaller case was winchester and the fullsize case was federal. For numbers sake the 338-06 winchester case held 71.3 gr. and the federal held 67.9gr, to me that's a big difference.

weigh a fired case with the primer still in, then fill it with water and re-weight it, subract dry from full and you have case capacity. No do with each lot you wish to test and you will know how to adjust accordingly.

NOTE: A thick case holds less powder but it gets the same velocity as the thin case with more powder..So thats not hardly an issue except powder saving and a grain or two makes very little difference to me from a savings standpoint, I am more concerned about the price of gas right now!~

I like the Win. brass, Lapua, and Norma best as it last longer...I think thats what the difference in brass should be based on.

Just for the fun of it I loaded up some Norma,Laupa,Hornady and Win brass for my 6.5x284 all with the same load these were once fired cases and I didn't weight them either over the 35P chronograph there wasn't 3fps difference in a 4 shot groups size was in the .2's. I've done the same thing in a pair of 30-338mags maybe I'm just lucky. I've got a pair of 300mag one has a lilja other a kreiger barrel for one I use win cases the other fed case and to get the powder about the same density as win cases I have to use a longer drop tube on the fed cases same load in both rifle the lilja is appr 40fps faster switch cases and it's the same so to me it's has nothing to do with cases just one barrel is alittle faster than the other. I'm sure there are shooter that have had the different result but you never know till you try it. I've got one tight neck 6ppc that will take anything as to cases other one that won't. Well good luck