ive always had people tell me to bump shoulder on my cases how does that help wiht my reloades and what does it do
what does bumping the shoulder mean and do??
- Thread starter jacobharper11
- Start date
Re: what does bumping the shoulder mean and do??
Look at the sticky posts at the top of the page
http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=1696162#Post1696162
Look at the sticky posts at the top of the page
http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=1696162#Post1696162
Re: what does bumping the shoulder mean and do??
I hope a lot of our new reloaders read what I am about to write.
KNOWING HOW IS UNIMPORTANT IF YOU NEVER LEARN WHY.
You need to understand why you do a thing, to truly master any art. Make no mistake handloading is NOT a science, it is an art.
I hope a lot of our new reloaders read what I am about to write.
KNOWING HOW IS UNIMPORTANT IF YOU NEVER LEARN WHY.
You need to understand why you do a thing, to truly master any art. Make no mistake handloading is NOT a science, it is an art.
Re: what does bumping the shoulder mean and do??
When you fire a round, the brass fire forms to the inside dimensions of your gun's chamber.
The case can be extracted because when fired there is a bit of spring back with the brass.
Once fired you need to resize it prior to loading it again. If you neck size only all you do is down size the neck enough to put tension on the bullet when it is seated in the case. Even with neck sizing you will eventually have to FL size the brass. Some argue neck sizing provides the most accurate ammo. It depends on your gun, more explicitly, your gun's chamber.
If you choose to FL size the case the FL sizing die will resize the entire body, shoulder and neck of the case. The shoulder bump you are asking about is the down sizing of the shoulder area on the case. It is recommended you bump the shoulder back .002" to ensure easy chambering in your gun.
If your gun has a generous chamber and your die is on the tight side of the tolerance scale you can easily over work the brass. For example, if your fired case expands .005" in length and you always push the shoulder back that far you will have shorter case life from overworking the brass during firing and resizing.
It's good practice to know how much you are pushing (bumbing) the shoulder back. You measure that with a comparator and there are several on the market.
When you fire a round, the brass fire forms to the inside dimensions of your gun's chamber.
The case can be extracted because when fired there is a bit of spring back with the brass.
Once fired you need to resize it prior to loading it again. If you neck size only all you do is down size the neck enough to put tension on the bullet when it is seated in the case. Even with neck sizing you will eventually have to FL size the brass. Some argue neck sizing provides the most accurate ammo. It depends on your gun, more explicitly, your gun's chamber.
If you choose to FL size the case the FL sizing die will resize the entire body, shoulder and neck of the case. The shoulder bump you are asking about is the down sizing of the shoulder area on the case. It is recommended you bump the shoulder back .002" to ensure easy chambering in your gun.
If your gun has a generous chamber and your die is on the tight side of the tolerance scale you can easily over work the brass. For example, if your fired case expands .005" in length and you always push the shoulder back that far you will have shorter case life from overworking the brass during firing and resizing.
It's good practice to know how much you are pushing (bumbing) the shoulder back. You measure that with a comparator and there are several on the market.
Re: what does bumping the shoulder mean and do??
But a good loading manual - and READ it. There is more information in a manual than just data!!!!!!!!!!
But a good loading manual - and READ it. There is more information in a manual than just data!!!!!!!!!!
