I was loading some range scrounged 7x57 brass tonight, and there were 2 different sets of Imperial Brass. One set my charge came to the bottom of the neck, the other set the charge overfilled the case. I had a good selection of brass, the one that held the most powder was norma, and the rest were all different. Just a reminder that it is good to check.
Brass capacity...
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There was a thread on this not so long ago;
http://www.canadiangunnutz.com/forum/showthread.php/1120440-Some-7X57-Case-Capacities
I've got a good variety of 7x57 cases myself. If I get a chance I'll weigh some up for comparison.
http://www.canadiangunnutz.com/forum/showthread.php/1120440-Some-7X57-Case-Capacities
I've got a good variety of 7x57 cases myself. If I get a chance I'll weigh some up for comparison.
Nothing is chiseled in stone but a good idea is to consider that for every 10 grains one brand of case is heavier than another the capacity of the heavy case will be reduced by approx. 1 gr of powder. Be very carefull with some brands of brass. For example I have some weatherby brass in 300 Wby and some Rem brass. The rem brass is over 30 grs heavier and the max load in the Rem cases is 3 grs less than the Wby cases.
When I first started loading for my AR15s rifles I went to a lot of AR15 forums looking for what other people loaded for practice loads because I had three five gallon buckets of mixed .223/5.56 brass. I was surprised that to find it was around 25 grains of H335 with people using mixed brass. Below is just one reason why, these 5.56 cases are 6,000 psi different in chamber pressure with the same load of H335. At 100 yards or less with mixed brass this load is accurate enough from a 16 inch carbine and is easy on the brass.
Below is an Israeli IMI 5.56 case with the least case capacity of 28.8 grains of H2O at approximately 50,000 psi.
Below is a American military Lake City case with the most case capacity at 30.6 grains of H2O and 6,000 psi lower in chamber pressure.
With the exception of our Lake City 5.56 cases the Lake City 30-06 and 7.62 military cases were heavier and the thumb rule was reduce your load by two grains to compensate for their less case capacity. The good news is these military cases are built Ford Truck Tough and last longer than thinner American commercial SAAMI cases.
Below is an Israeli IMI 5.56 case with the least case capacity of 28.8 grains of H2O at approximately 50,000 psi.
Below is a American military Lake City case with the most case capacity at 30.6 grains of H2O and 6,000 psi lower in chamber pressure.
With the exception of our Lake City 5.56 cases the Lake City 30-06 and 7.62 military cases were heavier and the thumb rule was reduce your load by two grains to compensate for their less case capacity. The good news is these military cases are built Ford Truck Tough and last longer than thinner American commercial SAAMI cases.
Dear sunray
Reloaders in pistol and two gun competition use range pick up brass all the time for the simple reason during the completion you are not allowed all day to find the brass fired from your firearm and you pickup what ever you can find on the way back to the start line.
If you read more and posted less you would know and understand this, and if you understood what you were looking at you would also see that my range pickup brass is loaded at least 5,000 psi below max pressure in my Quickload charts.
Meaning any "experienced" reloader can inspect his brass for defects before and after loading range pickup brass and not have any problems. Let me amend that statement by adding "intelligent experienced reloader" and not a talking head without any experience on the subject.
Bottom line sunray, read more "facts" and post less garbage.
