?on RMR RN vs FP bullets

[egd]

I usually use their RN but I went to order some and they are out. So I was thinking (dangerous,I know), without changing my seating die would both of those bullets go down into the case the same amount? I know bullets seat from the ogive so would the die seat the same for those two? I know some of you use both of those bullets and wondered if anyone has checked that.
OAL would obviously be different, but seating depth is what's important. I really don't want to bother changing my die setting. I have one FN that was mixed in with a batch of RN one time,and it looks like it seats the same, but it's hard to tell for sure.

ETA- I just went to their site and they have RN back in stock, but I'd still like to know if they seat the same.

Edit again- read it wrong, they're still out. Plus, I'm using lee dies on a classic turret press.

 

[murf]

take your seating stem out of the die, find out where the stem contacts the bullet (mark the bullet with a sharpie and see where it's rubbed off), measure from the contact point to the base of the bullet to find out if the seating depth is different. you'll have to do this with both bullets to find out. hope you have one of your old bullets.

murf

 

[AnselHazen]

Yeah I'm watching that page too. He has been out of RN and I want to stock up on it. The club is going to nix hollow point ammo for use in the competitions this year.

 

[egd]

I don't want to mess with my seating die. I'd never get it back in the right spot again.

 

[FROGO207]

Simple, save one of your reloaded bullets to use as a setup bullet and reset die to it when you change back. Just run the bullet up all the way with the die unscrewed a bit and seater stem out some as well. Then turn the body in until it stops and then the seater in until it stops as well. Lock in place. All done. In the future make one without a primer of each type and have easy setups for all your known loads. I use this method when I have a factory round (usually hollowpoint) that feeds well and I want to duplicate the results. Then just work up your load.

 

[egd]

OK, thanks. That sounds even easy enough for me.

 

[9mmepiphany]

So I was thinking (dangerous,I know), without changing my seating die would both of those bullets go down into the case the same amount?

No, because the bullets are different lengths...the FN is shorter and will be pushed into the case less, because...

OAL would obviously be different, but seating depth is what's important. I really don't want to bother changing my die setting.

OAL wouldn't change.

Why would it?

The distance between the case mouth and the seating insert would be the same. A shorter bullet would just be pushed into the case less

 

[egd]

Well, I thought that the seating plug didn't touch the top of the bullet but made contact down on the side (the ogive). The flat point bullet just has less point,so to speak, so my question was/is if that contact point would be the same on the two bullets by the same manufacturer. I was hoping some that had loaded and worked with both would know.
If you just cut off the top portion of the RN bullet above where the die touches it you'd have the flat point.

 

[9mmepiphany]

I've loaded both the RMR RN and FN 124gr bullets.

When I did a trial run with the FN, without making any adjustments to my seating die, after having adjusted it to load RN slugs and the OAL was was different...oops, that should have read wasn't; sorry for the confusion

If you just cut off the top portion of the RN bullet above where the die touches it you'd have the flat point.

But then it wouldn't have the same weight.

 

[Duvel]

No, because the bullets are different lengths...the FN is shorter and will be pushed into the case less, because...

OAL wouldn't change.

Why would it?

The distance between the case mouth and the seating insert would be the same. A shorter bullet would just be pushed into the case less

I'm a bit fried, but it seems the COL certainly could change.

If the stem seats off the tip of the bullet then COL would be the same, but if it seats off the ogive then COL could change.

 

[egd]

9mmepiphany, Now you have totally confused me. First you say oal wouldn't change, but then in your next post you said it did change. The second post seems correct to me since you have a shorter bullet and the stem doesn't seat off the tip, as Duvel said.
When I was talking about cutting off the tip I meant just theoretically for shape only, not actually doing it and making a lighter bullet.
But most importantly, since you have loaded both without changing your seating die, did the depth of the bullet inside the case change or stay the same? That's my whole question of the post?

 

[9mmepiphany]

Sorry, That should have read "wasn't"...fingers moving faster than brain

The depth of the bullet in the case is what changed and that is why I went to a different seating stem.

I did that with both my RCBS and Hornady dies. They each have a flat seating stem that I use when loading FN bullets....which do seat off the tip of the bullet

 

[AnselHazen]

EGD, I recently was "had" by what you are discussing. I had been using an X-Treme 147gr RN that measured .667. I switched to a Hornady 147gr XTP that measured .656. I didn't change my seating die, expecting it to at least not seat deeper than the oal I was getting when I loaded the X-Treme RN.

Didn't work that way and first one I seated was done for the bullet puller. The oal was way to short and most likely an over pressure round. My fault, I was lazy and "assumed".

It's really not hard to spin out the seating stem so that your new round starts off getting pushed in a tiny bit. Then just bring it to the oal you want by turning it in and watching with a set of calipers. Doesn't take long at all.

 

[egd]

Ok, if you have a flat seating stem that seats off the tip that makes perfect sense. I understand that. But I don't think mine is flat, it's a Lee that came with the 4 die set. From reading here, over time, I understand that it seats off the ogive of the bullet. It 'appears' that the two bullets have the same ogive therefore that's why I was wondering if I could just use the same setting on the die.
I only have one fn bullet to play with. It measures .566. The rn bullets measure .585 to .589 (for a few I picked up). I made a dummy round with my fn bullet (ala Barney Fife ) and it measured 1.110. My normal rounds measure between 1.135 and 1.140. That leaves about .005 unaccounted for.
Next I'm going to try MURF's suggestion later when I get some time.

 

[egd]

AnselHazen-you posted while I was slowly typing. Two fingers.
I'm not concerned with oal (within reason) cause they will all work in my gun. I'm concerned with seated depth in the case. I don't know the shape of your bullets but that seems the important factor in where they contact the seating die.

 

[AnselHazen]

Lol, that's how I type too. Just sayin' bullet profile clearly made a heckuva difference in my case. I got bagged fair and square by not readjusting my seating die.

 

[gwpercle]

9 times out of 10 you are going to have to adjust the seating stem when using a different bullet. Only way to know for sure is to try one , you might get lucky.
Usually seating FP bullets with a RN stem will result in marks , a ring or rounded edge on the flat point....again only way to know for sure is try it , just might work.
Save one of your RN rounds to use to set/reset dies with. I make dummies of every different bullet shape and keep them just for resetting depth.
You can temporarily modify the nose stem with a drop of hot glue to fit the FN bullet , remove it when you want to seat RN's .
Gary

 

[Wreck-n-Crew]

Fwiw I've loaded 2 different 9mm bullet profiles without a need to change the adjustment on my seating die. A 115gr bbfp and a 120gr TC from my Lee molds.

So give it a shot before you move anything and see how its seating.

Sent from my LGLS991 using Tapatalk

 

[Duvel]

If the goal is to maintain a specific bullet seat depth (specific case capacity after bullet seat) with intention of maintaining equal chamber pressure, then the results due to bullet construction need to be observed. When switching to a different bullet it can not be assumed chamber pressures stay equal if all other factors remain the same.

Case in point: XTP vs MG HP in .40 cal. In weight and dimension these bullets are near equals, yet loaded in new brass, with identical charges accurate to 4 one hundreds, one will consistently chrono slower, and show greater case expansion than the other.

Will the above be the case with your components, possibly not, but worth consideration.

 

[longdayjake]

We got more of the RN in yesterday. Just FYI.