Powder for Necked Up 6.5 PRC

[Rockdoc173]

I necked up a 6.5 PRC to 7mm in a SA Archimedes with a 28" barrel. My first test loads used 52.5 to 57.0 of N-165 in .5gr intervals producing this graph.

I loaded up 10 more using old 168 VLDs I had going from 55.0 to 59.5 of N-165. I haven't fired those yet but I don't think I'm going to make the last few due to pressure, they're pretty compressed. So, here's the question: I need more speed out of the 166 ATips with less case volume so, do I go faster powder? If so, how much faster? I have some 4831SC that I'm going to try out, or should I look at going into the N-550 to RL-17 range? I guess I'm not understanding sufficiently the relationship between case volume, burn rate, and velocity

 

[Jerry m]

What powder works in .284 Winchester? Start there are move up.

 

[AccuSol-ERN]

I think h4831sc would be perfect in that setup. I run it in 6.5prc and it is a little fast burning for a long barrel and heavy bullets. Bumping up to 7mm should put h4831sc perfectly in the range.

The 7-6.5prc is popular with f-class shooters. You might search around on those forums too.

I went back and re-read your post. If you are truly just looking for more velocity, you might be at the limit of the cartridge. Sometimes you can only squeeze so much juice from a lemon. The easiest way to get big gains in velocity is bullet weight........better bullets (lighter weight and higher BC).

Ern

 

[Rockdoc173]

The whole reason I did this build was to tickle a steel target at 2k and have more energy than a 6.5 PRC. Quick math keeps a 153 ATip >M1 all the way out to 1700. With the 166/168s I'm not getting close to that. I need the velocity because I need the BC. If I can't make that happen, I'll just switch to a 6.5 PRC barrel and move on. I'll check the FC forums for it though. Thanks

 

[AccuSol-ERN]

I got ya. I like your style Dude.

Thats a cool project idea, let us know how it turns out......I think you are on the edge of working and not working.

Btw - H4831sc has been great for me accuracywise......but if you need the velocity too it may be a waste of time, it always seems to be midrange on velocity.

Ern

 

[DeathBeforeDismount]

I necked up a 6.5 PRC to 7mm in a SA Archimedes with a 28" barrel. My first test loads used 52.5 to 57.0 of N-165 in .5gr intervals producing this graph.
View attachment 8017924
I loaded up 10 more using old 168 VLDs I had going from 55.0 to 59.5 of N-165. I haven't fired those yet but I don't think I'm going to make the last few due to pressure, they're pretty compressed. So, here's the question: I need more speed out of the 166 ATips with less case volume so, do I go faster powder? If so, how much faster? I have some 4831SC that I'm going to try out, or should I look at going into the N-550 to RL-17 range? I guess I'm not understanding sufficiently the relationship between case volume, burn rate, and velocity

How did you neck it up? Stepped mandrels or strait to .284?

 

[DeathBeforeDismount]

Rl26 is what you want. Otherwise N565.

 

[Rockdoc173]

How did you neck it up? Stepped mandrels or strait to .284?

Pushed over a mandrel straight to .283, K&M doughnut tool to download the doughnut, size using a custom WGW sizer w/ .311 bushing, then back over a .283 mandrel.

 

[Rockdoc173]

Rl26 is what you want. Otherwise N565.

N565 is on the list. I've had good luck with Vihtavuori powders!

 

[Jackomason]

I'm tagging in for this. I have another thread going but I ordered a barrel last week.

I've got
H1000
H4831
N555
H4350
IMR 4350

So far I've been able to fit 60gr of h1000 under a 180 hybrid @ 2.955" oal. This was just to see how much would fit and not an actual load.

166 Atips may be the ticket in a short action. But there doesn't seem to be many reports on them.

 

[Jackomason]

Just put 58.7gr in and all fit well. It was compressed but couldn't hear it crunch.

This is what F-class john is running at 2925fps. Not sure what that means for me at a much shorter OAL but the powder fit!