6MM PRC

[Woollybugger]

The Bench rest guys really like, the Small Primers / Brass But out huntin', in the Bitter COLD,.. No, Thanks !
Everything I own Has, Large Primers,. except the Pistols and One,. .223 Rem / 5;56.
If you don't want to "Convert" to, the Lge Primer Brass, you'll Have to Live with, some "Dud's" ( Hang Fires ).
I've discussed this with, 4 or 5 guys,. getting,.. Hang-Fires.

The Bench rest guys really like, the Small Primers / Brass But out huntin', in the Bitter COLD,.. No, Thanks !
Everything I own Has, Large Primers,. except the Pistols and One,. .223 Rem / 5;56.
If you don't want to "Convert" to, the Lge Primer Brass, you'll Have to Live with, some "Dud's" ( Hang Fires ).
I've discussed this with, 4 or 5 guys Now, All getting,.. "Hang-Fires." ( Mostly with,.. Ball Powders )

zero hang fires or duds with stick powders.

 

[Idaho-Lefty]

Yup,. Changing to, Stick Powders, IS, the Simple,.. Fix !
I absolutely HATE hand weighing Stick Powders, so I bought a New, Lee Perfect Powder measure, JUST for, "Them"
I'm in the Process of "Wringing it Out" right Now to see If, I can "Trust it" to be +- a couple of tenths of a Grain.
So Far IMR 8208xbr, Passes "That Test",.. IMR 4350,.. Not, so much !
Good Luck !

 

[ELR LVR]

In lieu of any data, I would think 6-284 data would be a safe starting place since it is only a tiny bit smaller.

More than a tiny bit
6x284 is 60 grns of water
6mm PRC is approx 58 grns
---
would liken the 6 PRC more to a 243 AI ,
the 243 AI is 57 grns of water

 

[alf]

More than a tiny bit
6x284 is 60 grns of water
6mm PRC is approx 52 grns
---
would liken the 6 PRC more to a 243 ,
the 243 AI is 57 grns of water

You might wanna check those capacities again......

 

[Evan]

More than a tiny bit
6x284 is 60 grns of water
6mm PRC is approx 52 grns
---
would liken the 6 PRC more to a 243 ,
the 243 AI is 57 grns of water

That surprises me. My 30-6.5PRC is 70gns of water and I think the 7-6.5PRC is about the same.

 

[alf]

Cartridge	Gross Water Capacity
6.5 PRC	67.6 grains
6.5 Creedmoor	53.4 grains
6.5-284	64.3 grains
6.5 Remington Magnum	70.2 grains
.264 Winchester Magnum	84.1 grains

 

[Woollybugger]

More than a tiny bit
6x284 is 60 grns of water
6mm PRC is approx 52 grns
---
would liken the 6 PRC more to a 243 ,
the 243 AI is 57 grns of water

Per GRT the 6.5-284 is 66.3 gr H2O and the 6.5 prc is 68 gr so the 6prc (6-6.5 prc) should mimic the 6-284 rather well, and, fit better in a short action. I have both the 6.5-284 and 6-284 and could dripple water

 

[alf]

Per GRT the 6.5-284 is 66.3 gr H2O and the 6.5 prc is 68 gr so the 6prc (6-6.5 prc) should mimic the 6-284 rather well, and, fit better in a short action. I have both the 6.5-284 and 6-284 and could dripple water

My reamer was throated for the 105 class bullets, and fit perfectly in a S/A with the Wyatt's box with room to spare.

 

[Woollybugger]

My reamer was throated for the 105 class bullets, and fit perfectly in a S/A with the Wyatt's box with room to spare.

6-284 reamer?

 

[alf]

6-284 reamer?

 

[alf]

 

[JLT]

That surprises me. My 30-6.5PRC is 70gns of water and I think the 7-6.5PRC is about the same.

7-6.5 PRC (Lapua brass) is just a tick under at 69.4 gr. of water for my current lot.

 

[Woollybugger]

perfect

This is the target a bud posted.

 

[ELR LVR]

You might wanna check those capacities again......

Thanks
I just double checked
I might have typed wrong in my search
Im finding (Corrected) the 6 PRC is 56-58 grns of water
---
I dont own a PRC myself but last I looked at a 6.5 PRC case my mind instantly said
"That looks kinda smaller" - compared to the 6x284 case especially in length being over .100" longer according to the above JGS Reamer Print
---
I know I am definitely looking at and liking the PRC cases

 

[Woollybugger]

Thanks
I just double checked
I might have typed wrong in my search
Im finding (Corrected) the 6 PRC is 56-58 grns of water
---
I dont own a PRC myself but last I looked at a 6.5 PRC case my mind instantly said
"That looks kinda smaller" - compared to the 6x284 case especially in length being over .100" longer according to the above JGS Reamer Print
---
I know I am definitely looking at and liking

Thanks
I just double checked
I might have typed wrong in my search
Im finding (Corrected) the 6 PRC is 56-58 grns of water
---
I dont own a PRC myself but last I looked at a 6.5 PRC case my mind instantly said
"That looks kinda smaller" - compared to the 6x284 case especially in length being over .100" longer according to the above JGS Reamer Print
---
I know I am definitely looking at and liking the PRC cases

https://www.perplexity.ai/search/5731ab51-d225-4864-b9c2-cf0ae7e3ead7

 

[Woollybugger]

This is an old 1970’s coyote load 90gr FMJ (tried to save furs) 6-284 with a new 105vld set to get the bullet body above the donut. Best in a long action.

 

[ELR LVR]

https://www.perplexity.ai/search/5731ab51-d225-4864-b9c2-cf0ae7e3ead7

This is what I found,
wasn't sure how much capacity goes down when necking down from 6.5 down to 6mm
Each step up with the PRC shows slightly higher case capacity conversely
---
Not much info to find on it

 

[Woollybugger]

View attachment 1729155

This is what I found,
wasn't sure how much capacity goes down when necking down from 6.5 down to 6mm
Each step up with the PRC shows slightly higher case capacity conversely
---
Not much info to find on it

click the link above, 7 sources.

 

[alf]

I don't see how usable case capacity measurably changes when necking up or down, as you're not altering the body.

 

[B23]

Seems every manufactures brass even in the same cartridge has a slightly different amount of case capacity.
I've only measured case capacity in Hornady and ADG 6.5 PRC brass but they were both right at 68gr H2O with Hornady having a couple tenths more. I don't have any Lapua but they're usually pretty close to whatever Hornady's is.

I use Lapua in both my 6-284 and 6.5-284. I'll have to look back through my notes but if I recall it's right around 67gr H2O and that is from a fired case. New brass and sized brass always measure slightly less then fired unsized.