6ppc with heavies

J

joehunt

Regular
Rating - 100%
71   0   0
Location
Ashcroft BC
Just wondering if anyone has any experience with this? If so what are your thoughts/loads.
I’ve just started testing mine with a 29” 1 in 8 twist. Look like it will run 27 to 28 grains of h4895 behind a 105 grain hybrid.
Before you ask why not a br.
Because I had an action with a ppc bolt face, a ppc no turn reamer with .060 throat and a spare 1 in 8 twist benchmark sitting around so why not.
Joe
 
joehunt said:
Just wondering if anyone has any experience with this? If so what are your thoughts/loads.
I’ve just started testing mine with a 29” 1 in 8 twist. Look like it will run 27 to 28 grains of h4895 behind a 105 grain hybrid.
Before you ask why not a br.
Because I had an action with a ppc bolt face, a ppc no turn reamer with .060 throat and a spare 1 in 8 twist benchmark sitting around so why not.
Joe
Click to expand...
I din’t Ian a PPC But the 105’s sure work well in my 6mmBR our to 500 meters :cool:
I am using Varget
Cat
 
Quickload is showing 32gr water capacity for the PPC case. The '6mm AR' is a 6mm version of the Grendel, with 36gr of water capacity and these are typically heavy bullet shooters. The 6mm BR show 37.8gr of water for reference. You should be able to find some 6mm AR data and reduce accordingly.

I put an OAL of 2.305" which seats the 105 basically a bullet diameter in the neck. A load of 27 grains of H4895 gives a 108% load density, and a pressure of 73K! The same powder at 24.7gr gives 55K psi and a load density of 98.9%, velocity of 2732 fps. Given my love for Hodgdon Extreme powders, H4895 would be my first choice as well. Standard warnings apply to what I've posted here, work up to a safe level.
 
Thanks for the info guys.
OAL is 2.350 with the 105s
I worked up to 28.5 gr of h4895 started to get slight smear marks on the brass. Is that real north of 70k. Primer pockets are still nice and tight?
Can’t wait to see what speed there at. Should give me a good idea of pressure
 
joehunt said:
Thanks for the info guys.
OAL is 2.350 with the 105s
I worked up to 28.5 gr of h4895 started to get slight smear marks on the brass. Is that real north of 70k. Primer pockets are still nice and tight?
Can’t wait to see what speed there at. Should give me a good idea of pressure
Click to expand...

Quickload gave 79K for your OAL and charge weight with a velocity of 3018. It will be interesting to see your speed when you do chrono. If you get a chance to check your water capacity, that might help too.
 
joehunt said:
I measured 5 case they averaged 34.2grain full to the top.
Click to expand...

Pressure dropped to 66304 and velocity is at 2938. Small cases with heavy bullets do act a bit funny, so going by your actually experience is the key. You can tweak the burn rate of the powder to get the velocity to match, and then when you are doing various charge weights, it's easier to estimate the velocity you will see when you get there. I think that if the case volume and other inputs are accurate, and velocity matches, the pressure calculated is a pretty decent approximation. Let us know what you have for speed when you get there.
 
so Got out to shoot today.
Fire forming load 220 brass
Shot 2606 avg with 25gr of h4895

Formed brass
27.1 avg 2785
27.3 avg 2805
27.5 avg 2835
27.7 avg 2849

No hard bolt left. There might have been a little shine on the brass of the hottest load.
Slight amount of primer crater but primers still have a nice rounded corner.
Seems ok to me. The 27.3 shot almost no vertical at 200yrds and had an es of 14fps.
 
Last edited:
Thanks for the update! That's a great ES, you've got a nice setup there. Playing with QL and adjusting weighing factor and Ba and coming up with 57886 PSI for the 27.3 load. The 27.7 is 60580, your fire forming load would be around 44470.
 
Looking at the equipment lists for the 600 yard Nationals, the 6br is about the smallest case used. The others are all improved versions of the 6br.

Since the 6ppc is smaller and 500 meters is shorter than 600 yards, it will be really interesting to see how this works out.

Everything you read says the 6br has the advantage at longer ranges but who has actually tried a 6ppc? How much velocity do you need to be effective at 500 meters?

I will be watching this with interest.
 
Last edited:
It’s not to bad could maybe have gone to .100” or so but I didn’t think it justified the throater. I think it would be throat perfect for the 95 vlds as a backup. Might even be to long.

105hyd
FB449C02-E44E-45D0-BFD8-D4EEF33E3EA9.jpeg
95vld
63772857-3A0D-46A0-93D8-C9B51D3731AC.jpeg
 

Attachments

  • FB449C02-E44E-45D0-BFD8-D4EEF33E3EA9.jpeg
    FB449C02-E44E-45D0-BFD8-D4EEF33E3EA9.jpeg
    67.5 KB · Views: 63
  • 63772857-3A0D-46A0-93D8-C9B51D3731AC.jpeg
    63772857-3A0D-46A0-93D8-C9B51D3731AC.jpeg
    85.7 KB · Views: 63
You must log in or register to reply here.
Back
Top Bottom