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Neg. effects of seating bullets deep

Bottom Fodder

What are the negative effect of having to seat a bullet deep in the case to get the correct jump/jam in a short freebore chamber.
I realize it can change the internal case capacity as for as powder charge. But what some of the other effects it can have on accuracy
Thanks just trying to learn more
 
For the most part, you have already answered your own question.

There isn’t much to it really. The potential for reduced case capacity and the potential for having seating issues if the bullet base starts hitting a donut in the neck to shoulder junction. Those two are the ones that come to mind.

Some guns have a magazine and case feeding issues can crop up. In some examples feeding issues can be troublesome but in some examples they can be addressed with very minor work.

Careful brass prep and shoulder angle design can eliminate or mitigate the donut issue, but the case volume is directly affected by the bullet seating depth and there is some potential that this can limit the charge weight tuning level.

Running your seating depth sweep in the same sense as running your charge weight sweep is generally worth the effort. In rigs that have lands that you wouldn’t consider short, you can find that more than one node can show promise and sometimes it pays to pick the shorter jump but sometimes the one with the longer jump can last longer without chasing lands. So, there is a potential that in your context, a very short chamber can discourage looking at an even longer jump. So not having the latitude to seat even deeper might mean your depth node search gets cut short.
 
When having to seat a bullet deeper than optimal into the case because of freebore constraints, I have personally experienced no ill effects on accuracy.

But like @243winxb said, as long as the ogive doesn't sit below the case mouth you are good to go. Don't waste your brain with this. Just go shoot !
 
Thanks I feel sure I’m going to be asked this question next week by a new shooter/ loader and to make sure I answered correctly I asked.
In his case and based on the giving answers I think the possible reduced case capacity is the only thing he will have to deal with but the worst case scenario answers are good to know
 
The question was asked regarding accuracy , but the elephant in the room , sitting quietly in the corner was never addressed . The negative side of seating a bullet deeply in the case is the increased chamber pressure that can result . The wrong powder , the wrong , to long a bullet , and maybe a Magnum primer to get that "Super" load , could turn catastrophic in a split second . Sometimes ; I think we , as more experienced shooters , and reloaders take certain "givens" for granted . without realizing there are "Noobs" out there reading what we post , without a inkling of a understanding of the "givens" we take for granted .
 
Thank you D-4297 for pointing that out. I like you and others are aware of this but like you said A noobie might not understand reducing case capacity normally increases pressure. That’s what Bothers me about people listing loads without tell how the bullet is in reference to not only were it is at the lands (which can increase/decrease pressure) but were the base is in the case which will increase/decrease pressure
 
If you are having to seat the bullet to where the shank is past the neck shoulder junction, sooner or later you will run into neck tension problems due to the donut that will, sooner or later, form at that point after repeated firings and sizing.
 
Fhttps://precisionrifleblog.com/2020/03/29/bullet-jump-load-development/
Read this , I seat all my comp rifles at .060 off group has same POI out to .075 off , no problem with pressure or donuts .
 
brx6, so I will guess you are loading for a 6brx. Since this case, my favorite, has a very short neck, freebore is a very important consideration. When have a barrel chambered I always have in mind what bullet I hope to shoot. I give my Smith my .060 freebore reamer, a duumy round with a bullet seated so the pressure ring is exactly in the middle of the neck, and a throater. He throats it so a tiny mark is left on the bullet when a round is inserted into the chamber. Now you have room to adj. Seating depth and still have no need to have the pressure ring get to the base/shoulder junction. It works, I have had close to 30 barrels done this way. No problems.
 
Brx6 said:
What are the negative effect of having to seat a bullet deep in the case to get the correct jump/jam in a short freebore chamber.
I realize it can change the internal case capacity as for as powder charge. But what some of the other effects it can have on accuracy
Thanks just trying to learn more
Click to expand...
You cant have, Jump and Jam
 
triggerdog said:
You cant have, Jump and Jam
Click to expand...
Of course you can. It's only with an extremely long freebore that you may not be able to seat bullets close to the lands (i.e. touching or jammed) without leaving insufficient bearing surface in the case neck.
 
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