case trimming question
- Thread starter JigStick
- Start date
Shynloco
You can lead a horse to water, but ........
It seems a reloader should be able to come up with something better than that. ‘Cause’ , or "because or because I say so" would be a better answer. Before the Internet (that would be before most reloaders started reloading) reloaders manufactured trimmers with different size pilots. I know, everyone is confused but: when a case is sized the diameter of the neck is reduced meaning some pilots were designed to trim the case before the neck was sized.
The large pilot caused the reloader to go into mortal combat when forcing the pilot into the sized neck. Then things got complicated. The trimmer flared the neck while trimming causing the reloader more problems when removing the case from the pilot.
A remedy for those that sized first and then trimmed was to run the pilot against a file to reduce the outside diameter,
I have found the forming/case trim die is the most accurate method for trimming, then there was and still is the Wilson case trimmer; again they had two case holders, one for sized cases and another for fired cases, and no pilot.
The case gets longer, the case gets shorter: Who measures? If a reloader knew when the case stretches and where he should be able to figure ‘by how much’. And then he could really get confused when he found the case did not stretch.
F. Guffey
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1. Guffey the OP asked a question and based on that question he did not understand the dynamics of case expansion, resizing and elongation.
Guffey only you are confused. Everyone else here is ok. Why do you denigrate the forum and its members almost every time you post. Even you should be able to come up with a better post.
Why don't you go check your post count and the number of liked posts you have. You are doing something wrong.
2. No one mentioned different size pilots did they? This thread is not happening before the internet
3. Only the ignorant would suggest running a file against a hardened trimmer pilot. You are basically advocating damaging a file. No decent craftsman abuses his tools. I have never seen soft trimmer pilots and I don't think you have either.
4. I don't think you ever saw pilots intended for trimming before sizing since no one ever advocated that. No pilots were designed to trim before the case neck diameter is reduced.
5. Wilson case trimmers are irrelevant. They align the case on the body therefore they do not need an internal pilot. The case holder acts as an external alignment sleeve. The original poster never mentioned Wilson nor did I.
6. Who measures? Almost everyone measures since they do not have their M1A1 Eyeballs calibrated to .001. You should really proof your work because that last sentence only makes sense to you and no one else. If you had good intentions you would not post such junk. Why are your posts so disjointed?
Guffey only you are confused. Everyone else here is ok. Why do you denigrate the forum and its members almost every time you post. Even you should be able to come up with a better post.
Why don't you go check your post count and the number of liked posts you have. You are doing something wrong.
2. No one mentioned different size pilots did they? This thread is not happening before the internet
3. Only the ignorant would suggest running a file against a hardened trimmer pilot. You are basically advocating damaging a file. No decent craftsman abuses his tools. I have never seen soft trimmer pilots and I don't think you have either.
4. I don't think you ever saw pilots intended for trimming before sizing since no one ever advocated that. No pilots were designed to trim before the case neck diameter is reduced.
5. Wilson case trimmers are irrelevant. They align the case on the body therefore they do not need an internal pilot. The case holder acts as an external alignment sleeve. The original poster never mentioned Wilson nor did I.
6. Who measures? Almost everyone measures since they do not have their M1A1 Eyeballs calibrated to .001. You should really proof your work because that last sentence only makes sense to you and no one else. If you had good intentions you would not post such junk. Why are your posts so disjointed?
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I took care of that.
Again, who measures? The case can stretch or get longer. Then there is the case that gets longer from the shoulder to the case head but shorter from the end of the neck to the case head and again we go back to that part about case stretch. If the case increases in length from the shoulder to the case head; where did it stretch?
F. Guffey
dmoran
Donovan Moran
Where did it stretch?
The answer is the case stretched everywhere it was smaller than the chamber. Surely you know that the case inflates like a balloon so it stretches radially until it is constrained by the chamber. Unlike a balloon, once stretched the brass cannot be compressed back to its original state. When the stretched brass is squeezed by the FL die it cannot compressed but it is formed or displaced back to a smaller diameter. The only area not constrained by tooling is at the top of the neck. So the brass creeps up the inside of the die and gets longer.
The answer is the case stretched everywhere it was smaller than the chamber. Surely you know that the case inflates like a balloon so it stretches radially until it is constrained by the chamber. Unlike a balloon, once stretched the brass cannot be compressed back to its original state. When the stretched brass is squeezed by the FL die it cannot compressed but it is formed or displaced back to a smaller diameter. The only area not constrained by tooling is at the top of the neck. So the brass creeps up the inside of the die and gets longer.
Dusty Stevens
Shiner
+4, the perfect concise description of what happens.
Re-sizing and bumping back the shoulder will lengthen that case, and so you trim after re-sizing.
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