Hello, and welcome to the Reloading Podcast here on the Firearms Radio network. Tonight the guys are catching up on emails
Hey Gents - yer Canuck was talking about the reason for fire forming cases on his other Podcast. He indicated that one of the reasons to do this was to eliminate the energy lost to expanding the case to chamber.
Now I don't call myself no expert but I ain't never heered o'that being any kind of reason to fire form. I cannot image how there can be any "energy" is lost to case expansion in a full length sized case compared to a fire formed neck sized case. Bullets are accelerated down the barrel via the pressure created when propellant powder burns and generates gas. A larger case volume would technically result in less pressure as there is more room for the gas to expand, however when fired both the previously fire formed case and the full length sized case expand to the walls of the cartridge chamber, thus their size and internal volumes will be the same.
My understanding from all the reading I have ever done (I've been at this long enough that I had to read this stuff in books and magazines not just google up some youtube videos) the reasons for fire forming is tighter more concentric fit in the chamber resulting ultimately in greater accuracy.
Neck sizing then preserves this fire formed shape, realizing the increased accuracy and reduces the working of the brass, making it last longer.
I have in the past also used fire formed brass for rimmed cases to get them to headspace off the shoulder instead of the rim, largely to reduce the working of the brass and increase case life. It's particularly handy with say a 303 Brit where rifles can develop headspace that is a tad on the generous side.
My belief is that the Canuck is on glue. Can you confirm?
Here's my thoughts on it, it's not due to trying to mitigate energy loss, it's for trying to make each case consistent in volume. Which means you'll get more consistent rounds.
ACTUALLY, if you Fire form then just Neck size, you gain capacity and lose velocity. Hence the reason I went to using a Redding Body Die. I get consistency and still able to hold on to MV
I really enjoyed the podcast with Chris Hodgdon. What a great time. It is nice to hear from a powder manufacturer, the information was just fantastic.
Great podcast as usual. I am enjoying the shows, and always pick up an idea or two. Thanks, Mike
I've been fascinated with big bores for a long time, and spent a lot of thought on what these larger mass bullets offer. One pet peeve is absolute idiots guffawing about how mass and kinetic energy are interchangeable, and how their 9mm is the equivalent of a .50 BMG. This is how I view the matter:
The power we are discussing isn't a myth, it's just misnamed. It isn't sufficient to knock you down, but it is plenty adequate to make you miss me. Why don't you stand straight up while firing a gun with recoil? Because that gun will rock you back on your heels and spoil your follow up shots. This force, felt by YOU in the form of recoil, is felt by your ENEMY (equal and opposite reaction) when you shoot him. The fortunate difference is your enemy cannot anticipate that force PUNCHING him in the wound you just created (we'll ignore the physiological and psychological advantages of this for now) and it will always spoil his follow-up shots. So now you know that people shooting guns with no recoil, the guys who guffaw at your heavier bullets and prattle on about rate of fire, mag capacity, and kinetic energy, are ignorant morons, just simple minded parrots congratulating themselves for repeating what they are told.
It's not "Knock-Down Power" it's "Can't Touch This Power." I guess from a reloader standpoint, you select the best weapon for the job, because that is what a bullet is, a weapon, just like an arrow, a sword, or a war hammer. I just happen to think the war hammer has some unique advantages beyond amputating hands or feet, turning extremities inside out, liquefying bone, or making nice crimson rain clouds, it can make someone shooting at you miss. How much is too much is a secondary argument.
Just listened to episode #146 and thought of something that might help you out. My local reloading supply shop gets bullets in bulk and uses a digital scale and counts them by weight instead of counting out each one. Might be worth a try. I know they won't all have the same weight but should get you close to the count you want faster. Maybe weigh a box and get the average weight per bullet then multiply by the count you need.
Thanks for another great episode!
Author: Roger Reloader
Title: GREAT Show
Review: To all, I truly appreciate the knowledge that each of you share with us the listeners. All of you treat each question with respect and with the understanding that the person asking the question is new to reloading like myself. I've asked a question on the Facebook page which ended up on Show 137 I think. Keep up the great work that each of you do in providing information
Title: You suckers
Review: For the last 20 years or so I have been plugging away on my Hornady single stage doing multiple steps and die changes to get completed cartridges. No thanks to you suckers I have recently purchased a Dillon 650xl. You have cost a ton of money but it does seem to save me time. So I don't know whether to thank you or curse your names. Anyway great show keep it up great show.
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