Anyone here reload 50 BMG?

[dkhunt14]

Well you just proved beyond a doubt that you know nothing and don't want to know and don't have the means to measure it.
It is very real and by using enough dwell you can achieve much more uniform FL resizing.
Who cares what all those 50 cal shooters think if they are so ignorant to think that FL resized brass moves and takes a permanent set instantly. It does NOT creep and take a permanently in an instant.
It may not take on the exact location of the shoulder in the die unless the press is unloaded and reloaded 3 to 5 times. The phenomenon is easily detected with calipers using a shoulder bump gage. You can easily find out the shoe fits if you actually measured brass given dwell time and multiple sizing strokes. Your lack of imagination and your closed mind gives me the impression that you are not a technically inclined type.
All you have to do to prove me wrong is check the brass over a run of 100 cases. I guarantee you will produce some with a longer head to datum dimension.
Variables include the speed of the sizing stroke, the amount of lube used and how well it is distributed, the amount of dwell, the neck and shoulder anneal condition and the number sizing strokes. All of these affect the final position of the shoulder.
Here is more proof that you NEVER imagined. My Rockchucker press stretches .002" when FL sizing machine gun fired SL-54 30-06 brass. When the brass is retracted from the die and rotated and sized again with a dwell the press is no longer stretched. The shoulder of the cases move back another .002. If you repeat this 4 or 5 times with dwell the brass eventually quits moving. I think that proves you do not measure the shoulder location of your brass over long runs and you don't really know how dwell affects the shoulder location.
It is all about measurement and precision. You can't win by arguing about a physical phenomenon. You have to prove it by actually testing your erroneous assumptions.

I have never ran into this. Your press or die must be springing. I can resize 300 WSM brass, which is as thick as any brass on the market and hold .001 on the shoulder datum without any dwell time. I also use a custom die and size them super hard and smaller. So this should show more then a regular die. I anneal every firing. I have loaded about 20,000 plus cases for competition and never saw this.

The Dasher brass is way thinner and smaller and can be sized with way less effort then my WSM brass. I also don't see this with them either. I guarantee I am anal about sizing and consistency, probably way more then most people. I measure and check everything including shoulder diameters. Matt

 

[stacy]

I LOAD ALOT OF 50 BMG I USE A HORNADY 50 BMG PRESS HORNADY DIES H-50BMG A THE 750GR AMAX AND THEY SHOOT VERY WELL SHOT OUT TO 1350 YDS DID GREAT JOB