Seating flat based bullet??

[Siiri]

Hello,
I have 7mm 100gr HP Hornady flat based bullets that I'm having trouble seating. They do not want to go into the casing and they end up getting stuck in the die.
Any tips on how to seat flat based bullets?

Thanks!
Siiri

 

[RonAKA]

I do not do anything different to seat flat based vs boat tail. It sounds like the neck is potentially too tight after sizing. Is the sizing ball going through the neck as you withdraw the brass from the sizer? You should feel the force required.

 

[jo191145]

Sounds to me like somethings all amuck.
When somethings all amuck its past time to start measuring.
Chamfered cases is step 1.
Maybe Rons suggestion is step 1. I'm undecided
No offense meant Siiri but where the hecks Kona?
Wake that boy up and give him a slap for me.
Measure. You'll figure it out.

 

[K0na_stinky]

Sounds to me like somethings all amuck.
When somethings all amuck its past time to start measuring.
Chamfered cases is step 1.
Maybe Rons suggestion is step 1. I'm undecided
No offense meant Siiri but where the hecks Kona?
Wake that boy up and give him a slap for me.
Measure. You'll figure it out.

We had the brass all prepped and primers seated and the other night we decided to finally make some rounds for Siiris 7-08.

I didn’t measure anything but it seemed the bullet just got hung up on the edge of the neck of the case. The bullet got jammed into the seater. I had to take it apart to get the bullet out. The case neck was slightly bent in so we resized it and tried again with the same result and gave up for the night.

I’ll have a look over it with Siiri next time I’m over at her place.

Cases were chamfered and the expander ball did go threw and there was resistance pulling the case out. Maybe it has the wrong size expander ball from the factory. They are RCBS dies.

We even tryed chamfering the inside of the neck alittle extra.

Thanks for the input guys.

 

[jo191145]

Just when you thought rimfires were a pain in the..... ;D

 

[K0na_stinky]

Just when you thought rimfires were a pain in the..... ;D

Yeah Siiri is having lots of stupid problems. The bullets she has have a very square bottom edge. I haven't had problems seating my .20 cal flat base bullets.

Se also has some 120gr noslers that have a rounded base. We will try those out after we made sure every thing seems good.

 

[jo191145]

There are no stupid problems!!! Just stupid resolutions.
Eventually it will all come around. You could call this "growing pains"
Change of rollcall!
Look! Measure! Look! Measure!

As much as we proselytize on these forums its really not rocket science.
The easy part is measuring.
The hard part is theorizing why A equals B on the target. Or worse yet A + B = C on the target.
So far noone versed in math is forthcoming in an absolute answer.
Thats why its so much fun ;D ;D
BTW not to preach myself but,,, Do you have any idea how lucky you actually are to have a girlfriend participating in the shooting sports? Almost unheard of in my woods ;D Take Care and enjoy-Joe

 

[rain164845]

Sounds like the neck is sized too small without enough chamfer. If the neck is sized too small, you might not be able to chamfer it enough to cram a bullet in.
Joe

 

[K0na_stinky]

BTW not to preach myself but,,, Do you have any idea how lucky you actually are to have a girlfriend participating in the shooting sports? Almost unheard of in my woods ;D Take Care and enjoy-Joe

Siiri and her family were the ones that got me intrested in shooting. Well I was always interested but they helped push me to get my licence. Since Siiri and I got our licences its been a ton of fun.

 

[queen_stick]

Siiri,

Many people run in to this problem when trying to seat flat-base bullets, including myself. I think it was Boyd Allen (may have been someone else on this forum?) who suggested I was using a chamfer tool that wasn't sufficient for seating the flat-bases. Per their recommendation, I picked up a K&M neck reamer, and haven't looked back.

http://www.kmshooting.com/catalog/case-neck-chamfer-tools/controlled-depth-tapered-reamer_large_6mm-338.html

May be something you want to look in to...

Walt

 

[BoydAllen]

Have these cases been trimmed, chamfered, and deburred? Your chamfer should be wide enough, at the case mouth, for the base of the bullet to sit in it, before it is seated, but not so wide as to eliminate the flat at the end of the case mouth. The deburring of the outside corner of the neck should be just that, with little angle showing after the cut. There was an article in Precision Shooting Magazine in which the author presented test data that showed that using a VLD chamfer gave straighter bullet seating. What sort of sizing die are you using?

 

[K0na_stinky]

Have these cases been trimmed, chamfered, and deburred? Your chamfer should be wide enough, at the case mouth, for the base of the bullet to sit in it, before it is seated, but not so wide as to eliminate the flat at the end of the case mouth. The deburring of the outside corner of the neck should be just that, with little angle showing after the cut. There was an article in Precision Shooting Magazine in which the author presented test data that showed that using a VLD chamfer gave straighter bullet seating. What sort of sizing die are you using?

The cases were trimmed and chamfered and deburred. On the second try we chamfered the inside alittle more with the same result. Siiri has RCBS dies. Just the cheap ones.

 

[BBTC48]

Don't ask me how I know what happens when you try to stuff a 6.5 in a 243 case. !! Are you sure you didn't get into a box of 30 cals by mistake ??? I shoot lots of flat base pills and there really shouldn't be much of a problem provided there is a sufficient chamfer and you just stand them up in there carefully. Good luck.

 

[K0na_stinky]

Don't ask me how I know what happens when you try to stuff a 6.5 in a 243 case. !! Are you sure you didn't get into a box of 30 cals by mistake ??? I shoot lots of flat base pills and there really shouldn't be much of a problem provided there is a sufficient chamfer and you just stand them up in there carefully. Good luck.

No we are 100% sure that they are 7mm bullets. At least the box says 7mm.

 

[BoydAllen]

Measure a bullet's diameter and post it. What is the sized case neck OD and what are the neck wall thicknesses, at two points across from each other? What are the markings on the seater die?

 

[RonAKA]

This is more of a problem avoidance than solving your current problem, but many flat base bullets have a "pressure ring" at the base. I find it measures almost 1/2 a thou larger than the body of the bullet. This can make seating them a little more difficult. Of just the bullets I have measured, Berger and Bart's have pressure rings, while the only Sierra flat base I have, does not have one. If this is true of all Sierra bullets then they may seat a little easier.

 

[Siiri]

I measured my cases and my bullets. Here are my findings:
Inside of neck on sized Remington cases - 0.2815"
Inside of neck on brand new non-sized Remington cases - 0.281"
Hornady bullets - 0.284"

 

[LHSmith]

Be more aggressive with the chamfer tool...yes those bullets have a very tiny radius at the heel, but many custom FB's have an even sharper edge. In a hunting rifle you aren't going to ruin the brass by chamfering to get the bullet to start. A VLD chamfer tool will help a lot.

 

[BoydAllen]

Your chamfer should be wide enough, at the case mouth, that the base of the bullet rests on the angled cut, not the flat end of the case. With the seating die out of the press, can you drop a bullet into the die, point first, so that it is stopped by the bottom of the seater stem, with the bullets nose inside the cavity, but not bottoming? Will the case fully enter the die without resistance? If you insert a loaded round in the seater, will it go in all the way without resistance?

 

[jonbearman]

Has anyone thought that the internal dimensions of the seating die may be wrong or it was improperly stamped? Just a thought. I have seated the flattest based bullets in the world and never had this problem.Try to seat just one with a .308 seater and see if it makes any difference.If it goes easy then the die is the problem.Could it be that the die is turned to far down so it is crimping as the bullet is being inserted?