QuickLoad request

[Sendit6.5]

Would someone mind running some quickload numbers for me? I’m curious about the pressures with H4350 in Lapua 6.5 Creedmoor brass behind a 140gr Berger Elite Hunter bullet and out of a 22” tube. Federal 205M primers. Specifically, I’d like to know the numbers at 43gr, 43.6gr, 43.8gr, 44gr and maybe 44.2gr and 44.4gr

Where I’m at is, I’ve been doing some load workup here and there, when I get time off at the ranch. A few weeks ago I loaded a bunch of different charges between 41.8gr and 43.6gr. I found a great accuracy node around 42.4gr (2680fps) and 42.6gr (2695fps). Only thing was, my velocity was a little lower than I’d hoped for; but that’s not crazy low . So, anyway, I walked up to 43.6gr in .2gr increments and never saw ANY visible pressure signs and no substantive increase in bolt lift. Maybe the SLIGHTEST hint of increased bolt lift at 43.6gr; but I couldn’t even be sure. Because of this I’d like to see if I can find another node with some increased velocity; but I want to know what the pressures are before I head into uncharted waters for me. I’ll just drop down to that 42.4gr node if I’m at the max pressure.

FWIW - rifle is a custom Defiance Deviant Tactical w/ a 22” Bartlein 3B in a McMillan stock with APA bottom metal and a Jewell trigger.

Thanks in advance!



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[Hawk in WY]

I will take a first crack at answering your question but I am travelling for a month starting tomorrow.

At the standard COAL of 2.80, H2O case capacity of 53.5 and at 70 degrees the data you seek are as follows:

Pressure Velocity
43.0 60,659 2720
43.6 63,327 2755
43.8 64,246 2765
44.0 65,176 2779
44.2 66,124 2791
44.4 67,084 2803

Max SAAMI Pressure is 63,091

Assumptions matter. COAL, case H2O capacity, and your particular lot of powder can vary pressure by 10% or more.

Now here's why I'm answering your question.

The Optimal Barrel Time nodes for a 22 inch barrel should be at 41.3 (2,617 fps) and 43.5 grains. Try those and let me know how they shoot.

Good luck

Edited to add: QuickLOAD is also telling me you might see around 30 fps higher velocity with IMR 4895, RL-15, or Hybrid 100-V but at slightly higher pressures at the equivalent of the 43.5 grain load. H4350 is the powder I would select from the list. 30 fps is not worth 1,500 psi added pressure.

Second Edit: QuickLOAD predicts 2,684 fps with a 22 inch barrel at 42.4 grains. You are getting 2,680. Interesting.

 

[Sendit6.5]

I will take a first crack at answering your question but I am travelling for a month starting tomorrow.

At the standard COAL of 2.80, H2O case capacity of 53.5 and at 70 degrees the data you seek are as follows:

Pressure Velocity
43.0 60,659 2720
43.6 63,327 2755
43.8 64,246 2765
44.0 65,176 2779
44.2 66,124 2791
44.4 67,084 2803

Max SAAMI Pressure is 63,091

Assumptions matter. COAL, case H2O capacity, and your particular lot of powder can vary pressure by 10% or more.

Now here's why I'm answering your question.

The Optimal Barrel Time nodes for a 22 inch barrel should be at 41.3 (2,617 fps) and 43.5 grains. Try those and let me know how they shoot.

Good luck

Edited to add: QuickLOAD is also telling me you might see around 30 fps higher velocity with IMR 4895, RL-15, or Hybrid 100-V but at slightly higher pressures at the equivalent of the 43.5 grain load. H4350 is the powder I would select from the list. 30 fps is not worth 1,500 psi added pressure.

Second Edit: QuickLOAD predicts 2,684 fps with a 22 inch barrel at 42.4 grains. You are getting 2,680. Interesting.

Thank you, sir! IÂ’ll follow up with you when I can. WeÂ’re swamped with hunters right now and itÂ’s usually dark when IÂ’m home. But the first chance I get to do some shooting, IÂ’ll post some results.

Here’s a photo of one of my target sheets from the last round of testing. I was mainly looking for velocity flat spots and POI - per Scott Saterlee’s method.

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[Hawk in WY]

Nice shooting.

I’m not sure two shot groups tell you what you need to know. You might try three or five.

At .020 off the lands you are probably lomger than 2.80 COAL. Longer COAL will definitely affect pressure and OBT. Let us know your COAL and someone might rerun the pressure and OBT data. I am away from QuickLOAD for the next 30 days.

I see you’re using new brass. You might see better results on the second firing when the brass will have fire formed to your chamber. Also send us the volume of water in grains to fill an average of three fired cases. That will allow more accurate QuickLOAD data.

I’m definitely interested in the 41.3 and 43.5 results.

Good luck

 

[ShebasDad]

Forgive this stupid question but .... what's wrong with the 42.4gr or 42.6gr loads the OP posted? The 42.4 only shows (guessing) 1/4" vertical spread and the .6 slightly more. If this were me would I be wrong to go with that 42.4 load? I'm just getting started loading and trying to understand what to look for besides pressure signs.


I’m definitely interested in the 41.3 and 43.5 results.

Good luck[/QUOTE]

 

[Hawk in WY]

Forgive this stupid question but .... what's wrong with the 42.4gr or 42.6gr loads the OP posted? The 42.4 only shows (guessing) 1/4" vertical spread and the .6 slightly more. If this were me would I be wrong to go with that 42.4 load? I'm just getting started loading and trying to understand what to look for besides pressure signs.

Not a stupid question at all.

Nothing wrong with those two loads at all if they are confirmed by five to ten shot groups with once fired, not virgin brass.

QuickLOAD and Chris Long’’s OBT theory point to 41.3 and 43.5 grain loads as accuracy nodes based on Chris’’’s Optimal Barrel Time theory given the assumptions about COAL, case capacity, and the particular lot of,powder being used.

The OP seems to be a good enough shooter that he should be able to test the theory and the power of QuickLOAD eventually with once fired brass and more accurate data about the few critical assumptions.

Looking forward to more data.