Horrible run out. 6/284

[Jimbee]

I had a tikka 8 twist 243 barrel reamed 6/284.
I necked down 6.5/284 Lapua brass in a full length Redding die. Apparently the inside of the die was super dirty and I couldn't resize my fired brass with it until a gunsmith polished it for me. Anyways, I noticed some of the reloads looked a bit off. I rolled a couple on my reloading bench and watched the 108 eldm tips flop around like a bent pool cue. It doesn't seem to affect accuracy.

 

[Lawnboi]

using a 6.5 seater? Could the tip be bottoming out on the stem?

 

[N2TRKYS]

Worrying about runout is a waste of time.

 

[Jimbee]

using a 6.5 seater? Could the tip be bottoming out on the stem?

I was originally using a Hornady 7prc seating die with a 6mm stem. I now have a Frankford universal seating setup that didn't fix anything. I'm thinking it's the sizing die?

 

[Jimbee]

Worrying about runout is a waste of time.

I haven't ever worried about it until it was obvious without even measuring.

 

[eLightfoot]

I went through this battle and it drove me nuts. Making 25/284 I had terrible runout. Still at times I get random loaded rounds with as much as .015 runout. The 6.5x284 type s sizing die with bushing makes crooked necks on the brass. Ended ordering a regular 25/284 sizing die from Redding and that helped. Make sure you have the inside necks freshly deburred and the brass is clean. Those things have helped the most but still will get some wild ass runout if I measure every round. Good news is you can’t shoot the difference between the crooked ones and the straight ones. It will for sure aggravate any OCD you might have.

 

[pods8 (Rugged Stitching)]

What barrel length do you have and velocity? Curious what a 6-284 does.

 

[Jimbee]

What barrel length do you have and velocity? Curious what a 6-284 does.

It's 17", with 49grains of H1000 I'm getting just a bit over 2700fps. I also have a 17" Tikka .243 that is getting about 50 more fps with H4350. I was expecting more speed, maybe a different powder would be faster?

 

[pods8 (Rugged Stitching)]

It's 17", with 49grains of H1000 I'm getting just a bit over 2700fps. I also have a 17" Tikka .243 that is getting about 50 more fps with H4350. I was expecting more speed, maybe a different powder would be faster?

Huh yeah I would have expected more too.

 

[TaperPin]

It's 17", with 49grains of H1000 I'm getting just a bit over 2700fps. I also have a 17" Tikka .243 that is getting about 50 more fps with H4350. I was expecting more speed, maybe a different powder would be faster?

I have a 6mm-06 and ran across this article - his velocities are for a 26” barrel, but his 06 case held a few less grains of water than fire formed 6mm-284, so it’s very similar. Anyway, thought you might like the load data.

6mm-06 Wildcat Load Data & How to Make Brass - RifleShooter

Load data and how to easlily make brass for the speedy 6mm-06, the rifle cartridge that pushes small-bore performance to the max.

www.rifleshootermag.com

 

[Lawnboi]

I was originally using a Hornady 7prc seating die with a 6mm stem. I now have a Frankford universal seating setup that didn't fix anything. I'm thinking it's the sizing die?

Probably the wrong guy to ask, was just my first thought

 

[Jimbee]

I have a 6mm-06 and ran across this article - his velocities are for a 26” barrel, but his 06 case held a few less grains of water than fire formed 6mm-284, so it’s very similar. Anyway, thought you might like the load data.

6mm-06 Wildcat Load Data & How to Make Brass - RifleShooter

Load data and how to easlily make brass for the speedy 6mm-06, the rifle cartridge that pushes small-bore performance to the max.

www.rifleshootermag.com

Much appreciated!

 

[eLightfoot]

It's 17", with 49grains of H1000 I'm getting just a bit over 2700fps. I also have a 17" Tikka .243 that is getting about 50 more fps with H4350. I was expecting more speed, maybe a different powder would be faster?

I ran up to 56grains of h1000 behind a 135 Berger in the 25/284. 49grains is super lite charge

 

[Jimbee]

I ran up to 56grains of h1000 behind a 135 Berger in the 25/284. 49grains is super lite charge

I get ejector marks at 50 grains.

 

[eLightfoot]

It's 17", with 49grains of H1000 I'm getting just a bit over 2700fps. I also have a 17" Tikka .243 that is getting about 50 more fps with H4350. I was expecting more speed, maybe a different powder would be faster?

I ran up to 56grains of h1000 behind a 135 Berger in the 25/284. 49grains is super lite charge

I get ejector marks at 50 grains.

thats really weird.

 

[Gear-Reviewer]

I get ejector marks at 50 grains.

That isn’t normal… I got better accuracy with rl23 than h1000 on my 25-284 btw but 50gr there shouldn’t even be a hint of pressure within a few grains of that…

 

[Jimbee]

That isn’t normal… I got better accuracy with rl23 than h1000 on my 25-284 btw but 50gr there shouldn’t even be a hint of pressure within a few grains of that…

Any theories?

 

[pods8 (Rugged Stitching)]

You're not jammed into the lands are you?

 

[Jimbee]

You're not jammed into the lands are you?

No, I shouldn't be.

 

[Harvey_NW]

Any theories?

Just a theory, and I don't have any first hand experience with finding data or loading for Wildcat-284 (yet..), but I have read about excessive headspace and too low of a charge allowing the case head to slap the bolt face and produce ejector marks that are actually false pressure signs.

Were you testing with fireformed brass?
Any bolt lift, or just ejector mark?
Where did you get your data?