I’m confused

[Cncmachinist]

I’m loading for my .224 Valkyrie

Now this is the round that I started loading with. I very much am still in a state of learning.

My chamber matches the drawing as best I can measure. These three rounds make sense to me.

I have loaded 90 grain Serria match kings .010 off the lands.
I have loaded 75 grain .010 off the lands.
I have loaded 90 grain Burger VLD .035 off the lands (max mag length)


What I’m trying to load some Barnes TSX and I’m have trouble.

First I have to load it super long. I measure it the same way with my gauge but it touches the lands .120” beyond whats physically possible... What am I missing?



The other question it the grooves, one is sticking out of the case. Is that an issue?

Thanks for any help

[JeffreyDeGraff]

It is normal for a groove to out of the case. As far as over all length, I don’t understand your question exactly. If you measured the Bullet to the lands, why do you have to load them too long?


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[Cncmachinist]

This is a .219 drill bushing.
All my loads measure great using it.

This one load is longer than possible. I would just like to understand.


Sent from a guy not loading or shooting

[Cncmachinist]

It’s .05” long not .120”



Sent from a guy not loading or shooting

[JeffreyDeGraff]

How have you determined what your overall length for each bullet should be? Because I don’t understand your exact process, I will tell you mine. For each different bullet you load, you will need to find an overall length with the chamber/throat of your rifle barrel. There are several different ways to go about this (hornady modified case with their tool, Frankford Arsenal tool that mounts on a cleaning rod, or dimpling a fired case and pushing it with a bullet in it, into the rifling). After you have done this, you measure the the bullet and case with a comparator ( like your homemade one) that way you can get a measurement to a datum point that is more consistent than the tip of the bullet. Each different bullet will have a different measurement, so you should have one length for the Sierra 90gr one for the Berger and one for the barnes. All of them should be different.


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[Cncmachinist]

How have you determined what your overall length for each bullet should be? Because I don’t understand your exact process, I will tell you mine. For each different bullet you load, you will need to find an overall length with the chamber/throat of your rifle barrel. There are several different ways to go about this (hornady modified case with their tool, Frankford Arsenal tool that mounts on a cleaning rod, or dimpling a fired case and pushing it with a bullet in it, into the rifling). After you have done this, you measure the the bullet and case with a comparator ( like your homemade one) that way you can get a measurement to a datum point that is more consistent than the tip of the bullet. Each different bullet will have a different measurement, so you should have one length for the Sierra 90gr one for the Berger and one for the barnes. All of them should be different.


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I put a bullet in a case and load it long.
I try to chamber it with the bolt.
I’ll turn in the bullet seater a quarter turn (repeat) until it seats in the chamber.
I use that as my new start point.

So am finding the lands with every load.

I just thought the dia datum would all bullets would end up being the same with in reason. Because they have to touch the barrel at the same point.


Thank you for your reply

[Cncmachinist]

It is normal for a groove to out of the case. As far as over all length, I don’t understand your question exactly. If you measured the Bullet to the lands, why do you have to load them too long?


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Thank you for your reply

[JeffreyDeGraff]

Hope I helped, at least a little. Sometimes it’s hard without being there and seeing it first hand. Had a similar issue recently with a friend, and after some texting and a couple phone calls, I told him put the beer on ice I’ll be there in 30 minutes. We got it figured out quick.


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[sagela]

"Because they have to touch the barrel at the same point. "

Nope. The bullets have different ogives. One .224 bullet tapers upward from the tip to groove diameter quicker than another bullet of the same weight.
You're already aware of magazine restrictions on C.O.A.L. Another potential restriction is the old rule of thumb, "seat the bullet to at least 1/3 the diameter of the bullet."
A long ogive and a boattail mean there's very little length of bullet at which it is really .224" in diameter - thus not much for the grooves to grab. This, in turn, reduces
drag in the bore which effects pressure. If some other thing, like magazine limitations, require deep seating, powder capacity can be reduced or a compressed load is required.
That's why most reloading data are now based on individual bullets rather than generic descriptions like "69gr FMJ."

Fun game.

[Cncmachinist]

"Because they have to touch the barrel at the same point. "

Nope. The bullets have different ogives. One .224 bullet tapers upward from the tip to groove diameter quicker than another bullet of the same weight.
You're already aware of magazine restrictions on C.O.A.L. Another potential restriction is the old rule of thumb, "seat the bullet to at least 1/3 the diameter of the bullet."
A long ogive and a boattail mean there's very little length of bullet at which it is really .224" in diameter - thus not much for the grooves to grab. This, in turn, reduces
drag in the bore which effects pressure. If some other thing, like magazine limitations, require deep seating, powder capacity can be reduced or a compressed load is required.
That's why most reloading data are now based on individual bullets rather than generic descriptions like "69gr FMJ."

Fun game.

Thanks



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