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6mm-250 pet loads

Do you plan to start with 250 Savage or 22-250 cases? The former are rare (although I have a bunch of W.W. unfired) so I'd be inclined to run fresh premium-grade 22-250 cases through your FL die, verify it only folds the shoulder angle back 1.5 degrees, then fireform "bulletless". Or expand necks up to 6mm using a good mandrel, then run them through the FL die.
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I bought the rifle from the original owner, and the dies came with it. Since he was fireforming loads I can only assume that the dies are correct. I have yet to load anything for it.
Then I would suggest having a good smith check the actual chamber dimensions. The seller may well have known what he was doing, but I wouldn't risk my safety without definitive information.
 
Do you have a fired case that has been unsized? A new 22-250 case?

Find a friendly machine shop that has an optical comparator and ask if they can compare the two shoulder angles for you. Failing that, maybe a reamer maker can tell you.? The body taper is nearly identical, the headspace dimensions are nearly identical. The shoulder diameter is identical. The shoulder angle is 1.5 degrees different. Not the same but this means that the brass from 22-250 will very likely chamber in a 250 based chamber and vise versa. But it won’t be the best situation.


I bought the rifle from the original owner, and the dies came with it. Since he was fireforming loads I can only assume that the dies are correct. I have yet to load anything for it.
 
It's pretty obvious you have a 6mm/22-250. Form the brass with new 22-250 with a tapered expander in you sizing (probably already there)or a separate expanding step then size. I had Lee build a custom collet die to straighten the necks after forming but you don't need that, New WW 22-250 brass sucks, the old stuff is very good. Of the current brass Nosler was the best I found
If you have an 8 twist H4350 for the 105 class bullets and Varget for the lighter bullets is a good place to start. Also had great luck with MR-2000 with both lights and heavy's​
 
First off, hopefully I posted this in the right section. I have a 6mm-250 with a 26" 1/8 twist Douglas barrel built on a Savage action that I bought about a year ago and am finally getting ready to start loading for it. I have mostly IMR powders at the moment, and a broad range of 6mm projectiles. Is anyone shooting this caliber, and do you have any loads you recommend? Mostly punching paper at the moment but may take it coyote hunting.

I own a rifle with a barrel marked 6mm/22-250 and have the same exact dies as you. I bought it on a whim not knowing what it was but after a bit of research, found out it was a matter of taking 22-250 new brass and FL sizing to make the cases. (lube the inside of the necks well because you'll be expanding them from .224 to .243) After that, not knowing where to start with load data, I called Sierra (had some 107's on hand) and they gave me load data for the powders I had on hand. I wound up using some Norma 204 powder, 38g for my load. I think you'll be in the same range using H4350 but call sierra/berger/nosler/hornady/speer/etc and I'd bet they can help out.
 
I bought the rifle from the original owner, and the dies came with it. Since he was fireforming loads I can only assume that the dies are correct. I have yet to load anything for it.

Very easy to confirm which. Take a fired case of each 22-250 and 250 savage and see which one fits the chamber. OR make a chamber cast. Then you will know beyond a doubt which case to use to form, etc.
 
Very easy to confirm which. Take a fired case of each 22-250 and 250 savage and see which one fits the chamber. OR make a chamber cast. Then you will know beyond a doubt which case to use to form, etc.
It's 100% certain a fired 250 Savage won't chamber. The case mouth will stop it. (Edit: I suppose the chamber will make a FL die of sorts, if you stand on the bolt handle.)
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I own a rifle with a barrel marked 6mm/22-250 and have the same exact dies as you. I bought it on a whim not knowing what it was but after a bit of research, found out it was a matter of taking 22-250 new brass and FL sizing to make the cases. (lube the inside of the necks well because you'll be expanding them from .224 to .243) After that, not knowing where to start with load data, I called Sierra (had some 107's on hand) and they gave me load data for the powders I had on hand. I wound up using some Norma 204 powder, 38g for my load. I think you'll be in the same range using H4350 but call sierra/berger/nosler/hornady/speer/etc and I'd bet they can help out.
As was pointed out here, Hodgdon publish data for 6mm-250.

If I were to call anyone, it would be Paul Box at Sierra.
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Nothing if pushing the same bullet at the same speed... Ballisticly speaking of course.
243 has more case capacity (308 size case vs a 22-250 size case.) just depends on weather your running the 6 250 on the high side or the 243 at normal or low side of velocity/ Pressure.
 
*raises hand*
So ballistically, what is the difference between a 6mm-250 vs 243 Winchester?
You get velocities that are 5-10% lower, using 10-20% less powder, and you get measurably better barrel life. You can compare the 300 Win Mag and the 30-06 to get a comparison. The 6-250 is ballistically like a 30-06 and the 243 is like a 309 Win Mag for the 6mm bore.
 
What is the real difference between the 6 international and the 6-250?
I've decided (with encouragement, and from re-reading Frank C. Barnes' description in Cartridges Of The World, 7th Edition) that the 6mm-250 is simply the 22-250 necked up to 6mm.

Also from Barnes: There are two prominent versions of the 6mm International, which (like the 22-250) are based on the 250 Savage case. Harvey Donaldson's is 0.25" shorter overall, and the shoulder is pushed back (I believe about 0.10"). Mike Walker's version similarly moves back the shoulder, but retains the original Savage case length, so it sports a longer neck.
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In general a 6mm-250 refers to a necked up 22-250. Case dimensions of the 250-3000 are minimally different.
The difference is the 22-250's slightly steeper 28-deg (vs 26.5-deg) shoulder. A 22-250 case may be formed from 250 Savage using just a 22-250 FL die.
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If you have a .380" long neck it's a 6mmIntl (Walker) version.

32 grains of target under 105/107.
Extremely accurate.
Consensus here is that "6mm-250" is just necked-up 22-250. 6mm Intl would say "6mm Intl" on the die box and die.
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33.2 gr Varget, .010 jump Sierra 107's with br2 primers. 5 shot group at 300 yards around .850. Savage action, Krieger barrel, 7.5 twist. H4831, 40.0 gr, .010 jump, br2 primers, 107 Sierra's. Slightly larger 4 shot group at 300 yards still under an inch. Still developing jump and bushing.
Good luck. 6/250 will shoot.
 

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