Originally Posted By: Evil_Lurker
"You probably should have mentioned that in your first post. Somebody dropping their pet .243 load developed with commercial brass in a resized 7.62 NATO case is living on the edge."
Originally Posted By: Evil_Lurker
"Drop 10% and work up from a data book that specifies a .308 Win case and you may already be at maximum pressure with the reduced case capacity. I don't see where it hurts to make people aware that 7.62 NATO and .308 are often not the same in regards to substituting one for the other.
In fact it might keep somebody from hurting themselves."
"... in a resized 7.62 NATO case is living on the edge.""
Oh, I love that part about "... livin' on the edge". Man are we dangerous type peoples or what???
""Drop 10% and work up from a data book that specifies a .308 Win case and you may already be at maximum pressure with the reduced case capacity."
That is pure, unadulterated BS - the manuals do NOT specify a civilian or commercial case.
I am constantly amazed at the people that give dire warnings about stuff they know nothing about, just so they can sound like experts.
"You're gonna hurt yourself"... "You're gonna blow up your gun!"... "Make sure you have life insurance before you shoot those loads"...
The mean (average) weight of a military, Lake City case is 185 grains - the "aim mean" weight of commercial cases is 175-ish grains.
Do you know what volume 10 grains of brass takes up, and how much of a powder reduction that volume requires to maintain the ~same pressure????
I thought not !!!!!
All hot air!
And what about civilian cases - do you know how much weight variation they have??
I thought not !!!
More hot air.
You don't know a damm thing about the subject, yet you yell warnings that the sky is falling.
Here's some REAL numbers.
In a 308 and .243 case, 10 grains of brass weight is equal to ~ 3/4 of a grain of powder... that means that if you have a warm load of Varget in your civilian cased 243, and you switch to a LC case, you will be warmer, maybe even show some pressure signs, but you ain't blowing up doodley squat.
And if you drop 10%, that is 4.5 grains, that is SIX TIMES the difference in loads between generic civilian and Lake City... enough to cover ANY difference in thickness of cases when developing a load, no matter what kind of case you are loading.
And what about civilian cases - I bought a lot of Federal "Gold Medal Match" cases about 15 years ago, and the groups from my 1,000 yd match rifle went down the toilet. I looked at all the usual suspects, and nothing... until I weighed the cases - the variation was 21 grains from light to heavy (which is why I don't use Federal brass anymore).
So, Evil dudette - what warning are you going to give us all about loading civilian cases? Are we going to blow ourselves up, cuz some are 21 grains heavier than others????
Where did I get this information - It is not an opinion, and I didn't read it on some BS forum like
www.blow-up-your-gun.com
I did it the old fashioned way - I used a pressure gun and shot the test loads.
So you can take a deep breath, and know that the world is safe without you running naked through the 100 yards berms at the local range, yellin' "The sky is falling, the sky is falling."
.