WTH!!!

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ar10

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I found a BIG difference in cases today
All cases 7.62x39mm once fired range brass, loaded with WLR's, and 25gn RL-7. I kept coming up with some weird looking loads, some were at the neck while others were below the neck. I kept dumping the powder and re weighing and every load kept coming out within 1/10 either way, that wouldn't make any difference in the amount of difference when looking at the cases. (all the cases were trimmed to 1.80 with less than 1/1000 difference +/-. What the problem was:
Starline brass weighed 111.9 gn
Winchester brass weighed 130.8gn.
FC brass weighed 122.4gn.
That accounted for the difference,18.9gn. I guess it wouldn't make that much difference except for compressing the load and the fact that Starline is a lot thinner than Win or FC. I don't think I'm going to use the Starline stuff because I'm loading .6gn below the max.
I hope Starline brass isn't all like that because I've got 5000 GAP cases ordered from them, and that's a +P load.
 
+1 for separating your brass by headstamp. Maybe not by company and year, but you have to separate them by company.

Cameron
 
Starline makes great pistol brass. You will be happy with their .45 GAP brass you ordered.

I cannot speak of their rifle brass, as I have not used any, but I can only think it is of good quality as well. Just because it is lighter than other brands does not make it bad or unsafe.

That is why, as everyone has stated, it is a good idea to sort by headstamp, or by weight.
 
the fact that Starline is a lot thinner than Win or FC. I don't think I'm going to use the Starline stuff because I'm loading .6gn below the max.
Click to expand...

The thicker brass is more likely to give higher pressures, if the same powder charge was to be used in all cases.

But because it's thicker, it's also gonna be stronger aswell, just all depends where the extra metal is located.
 
Just read all the replies:
if you would like to have that X39 shoot it's best try Lapua brass, even once fired if you can find.
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Of the 916 cases. ONE was Lapua. :( BTW it weighed 124.6 gn

That's why I always segregate my brass by manufacturer headstamp when I reload them, even if it's just blasting ammo.
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I always do. Here's the breakdown:
Lapua, Starline, FC, Winchester, PMC, Fioccia(sp), KC, IMI. Of course Lapua and Fioccia are the minority.
Starline makes great pistol brass. You will be happy with their .45 GAP brass you ordered.

I cannot speak of their rifle brass, as I have not used any, but I can only think it is of good quality as well. Just because it is lighter than other brands does not make it bad or unsafe.
Click to expand...

Hope you're right. I do know GAP has to have a +P load and I know the web has to be thicker. Cutting down a .45APC won't work, and don't ask me how I know this. :banghead:
 
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