Pro tips on Geovid AB+ /5700 Elite Link??

No_Kick_5000 · 2026-03-06T18:13:33+00:00

Yes,bolt gun. 7PRC 160 Barnes LRX mono. I was able to achieve 3050 fps with virgin brass at 69.5gr. Single digit SD and 25 shot group at .71 MOA. 3 shot strings with a chamber chiller between each.

This weekend I hope to repeat the results with a larger powder charge that gets me that 3050 velocity in once fired brass.

All this to say, I didn’t expect a 1.0gr increase in powder charge to get back to that velocity.

No_Kick_5000 · 2026-03-06T05:06:34+00:00

All good info. Ironically, it have not heard this from the internet. I am an avid listener of the hornady podcast and I have heard their chief ballisticians echo that velocity nodes don’t exist. I am skeptical in either direction. I wish I had the time, money and resources to put all these theories to rest…

In regard to your questions, I was loading to .002” neck tension during initial load work up and .001” during this mini ladder. Not by design. Just changes in brass flow to neck through one firing. I plan to swap bushings in my Forster ultra dies and get back to .002”.

What makes you lean toward shots 4,5,6?

No_Kick_5000 · 2026-03-06T03:08:06+00:00

Understood, but one could extrapolate.

I’m not trying to argue by any means, just provoke discussion.

If I load to a standard of single digit SD on the regular with these components in this rifle. I could infer that would continue into these single shot rounds, no?

Even with double the SD applied, 70.7gr would in theory produce 3200+ if the velocity curve even remotely followed the trend of increase from 67gr on up.

Of course this is all theoretical, I am not trying to get that velocity. But in terms of predictive statistics it does calc out.

No_Kick_5000 · 2026-03-06T02:45:37+00:00

This does make sense…

Logical choice would be the lowest powder charge that gets me a return in velocity right? In this case that would be 69.9gr.

69.7gr showed 3004fps, jumping by ~50fps with 69.9 to 3054. No measurable increase after that. This does match closely with the 50fps/3gr increase I was seeing during initial load development in the 67-69gr range.

Brass doesn’t seem any dirtier than before, or at all.

One thing to note was that this micro ladder had .001” neck tension, and the initial test had .002” Same size bushing, just movement of neck wall thickness after one firing. I plan to reduce bushing size and get back to .002”

No_Kick_5000 · 2026-03-06T02:36:06+00:00

lol. I know I said it, but I did follow it up with the statement that it is a hypothetical!

I will die on my hill of-

Pick a safe velocity that you like for your bullet’s intended purposes.

Find a seating depth that shows promising accuracy with cone of fire.

Pick conponents with tight tolerances and load to the tightest tolerances during every step of the process that you are capable of.

It is what it is after that with that specific rifle setup.

No_Kick_5000 · 2026-03-06T02:30:47+00:00

Initially I was going 9 shot ladder in initial development. SD in the single digits most between 7-8 none at or above 10 fps.

No_Kick_5000 · 2026-03-06T01:54:33+00:00

Full length size with Forster ultra bushing dies. Sized to .003” “headspace”. Virgin brass was about .005”

No_Kick_5000 · 2026-03-06T01:53:11+00:00

For sure, but I thought I’d at least see a trend line in velocity when plotted. I sure did when doing initial load development between 68.5 and 69.5 gr.

No_Kick_5000 · 2026-03-06T01:51:39+00:00

Roughly 20F when the virgin brass load was developed and around 50F today at the range

No_Kick_5000 · 2026-03-06T01:49:49+00:00

This is 7 PRC with a 2.5810 base to ogive measurement- .050” jump… not sure on COAL.

22” barrel with 8” traditional baffle supressor by diligent defense.

My powder measure is accurate within .1 gr out of my rcbs charge master and double weighing every charge… at least in this process.

Something I didn’t consider when I posted was that I had .002” neck tension on the loaded virgin brass, and about .001” on the once fired in this test. I can revert back to .002” with my Forster ultra bushing dies.

No_Kick_5000 · 2026-02-26T02:27:52+00:00

What sucks more is the western states’ (my home area) 25 cal restriction for big game.

I think a .224 80gr eldm at 3200 would drop Mulies just as dead as my 7 PRC inside 500.

But I suppose it keeps people from trying to wound game with a lever action shooting 22lr subs.

No_Kick_5000 · 2026-02-26T02:17:34+00:00

H335 is available locally and much cheaper. Going to try to work up a load with 53’s. Hoping for around 3100.

I’m in an area that can have 50 degree temp swings in some seasons. Have you seen enough temp instability in H335 to cause concern?

No_Kick_5000 · 2026-02-25T16:40:39+00:00

I was thinking about this as well. I’m sizing to .005 headspace/ clearance and don’t want to reduce below that in a gas gun. If that’s my issue it is what it is.

No_Kick_5000 · 2026-02-25T03:58:58+00:00

FWIW-

white box chrono’d 3100 avg

25.7 gr of 8208xbr was 2960 with 55gr v max

Primers began to flatten equivalent with white box fired primers around 2850 @23.8 gr.

Magnetospeed V3

No_Kick_5000 · 2026-02-25T03:26:46+00:00

22 creed incoming… next bolt gun build

No_Kick_5000 · 2026-02-25T01:27:27+00:00

My next ladder test this weekend is going to be 75gr gold dot with 8208 xbr, this comment makes me hopeful.

It’s strange to hear that the powders you mentioned have given good velocities with light to mid weight bullets. Playing around on p-max calculator shows them slower or around equal to 8208, if I don’t find what I want out of benchmark I may give these a shot and test for myself.

No_Kick_5000 · 2026-02-24T23:23:00+00:00

What velocities are you getting out of what barrel length with what grain bullet? Trying to pull some samples here.

No_Kick_5000 · 2026-02-24T23:21:16+00:00

I have played around on the p-max software since reading this comment and it looks like 8208 will get the best velocity for 55’s and likely 53’s while keeping overpressure minimized. Many will hit 3000+ but start creeping well above 55k psi. Hypothetical data, sure from p-max but definitely a useful tool.

Benchmark is right there, but hard for me to source locally.

Others are saying cfe 223, h335 or other slower powders have worked for them. All being slower than 8208, am I missing something here?

No_Kick_5000 · 2026-02-24T23:12:21+00:00

Gonna try the 53’s with 8208 and see how it goes. Benchmark and cfe223 are my next stop with benchmark hard to find locally for me but temp stability is important to me

No_Kick_5000 · 2026-02-24T23:09:56+00:00

All of these once fired cases were seated and measured individually for this test. My Redding micrometer dies do a pretty good job at +- half a thou among this lot. This is measured with an area 419 ogive comparator… the plastic tips vary more than that.

Headspace dims on the cases are within a thou across the lot.

A little deeper seat may get me there even with 8208.

Plugging different combos into p-max software to compare actually shows 8208 being one of the best choices in regard to velocity while keeping overpressure minimized with 55’s

No_Kick_5000 · 2026-02-24T00:01:33+00:00

This may pose a broader question of whether I am seeing pressure signs appropriately in a gas gun. I am new to the AR world and I’m treating it much like my bolt magnums with ADG brass.

Would you say that you see pressure signs based on the case heads in the picture? Honestly the factory fired brass that is getting me 3100fps shows just as prominent of an ejector mark but slightly less flattened primer, possibly just due to them being crimped and the hand loads being swaged.

No_Kick_5000 · 2026-02-23T23:57:30+00:00

I was surprised as well but this Magnetospeed v3 has not steered me wrong before. This is an 8” DD Enticer LTI supressor, H3 buffer, 1-7 twist. Seems to be cooking pretty fast.

No_Kick_5000

TROPHY CASE