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Discussion Starter · #1 ·
You know its a good day at the range when your first 11 shots across the chrony are(it was 11 because I cant count when loading the mag)

2520.29
2550.56
2556.49
2529.77
2521.87
2521.34
2553.79
2543.59
2561.35
2552.17
2548.95

MV 2545 fps
SD 15.5 fps
ES 41 fps


85 degrees, 650 ft above sea level, 80% humidity, no cross wind,

That's with 1x fired LC 07, 168 SMK , CCI#34, 40.5g of IMR 4895, 2.8 COAL, .336 neck bushing,

I shoot iron sights at 100yards from seated postion using the sling, and am embrassed to post a 3 inch group, blame it on the old eyes :) , ammo and rifle are good now, but I have to get better
 

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NICE!
Great SD !
BTW
3 inches is fine a Avg Human head is 7x7.
 

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Discussion Starter · #4 ·
Hi Phil,

my goal was to make an M-852 clone, Army tech manual specifies 2550 fps, so thats where I chose to stop, I figure they know more about the optimum velocity for the 168SMK than I do. I know they specify 42grs of IMR-4895, but I don't seem to need quite that much powder to get there. I also verified my chorno with commercial Remmington 150g ammo of known velocity, so I'm pretty confident that I'm at 2550 fps.
 

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The M852 I chrono'd ran about 2600-2620 FPS.

My clone loads like to move from 2550-2600 FPS. 41.0 - 41.3 gr IMR4895. Anywhere in that spread for me in LC cases is an MOA load.
 

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I may as we'll jump on the wagon too.

The velocity spec for the M852 is 2550 +/- 30 at 78'. That will convert to a mv somewhat higher. The lots that I have chronographed ran 2665, 2675, 2662, 2650, 2657, 2654, and 2667. That's 7 different lots, not 7 shots. Not all were chronographed on the same day, or even the same year, so I'd say they are very consistent.

Ray
 

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I may as we'll jump on the wagon too.

The velocity spec for the M852 is 2550 +/- 30 at 78'. That will convert to a mv somewhat higher. The lots that I have chronographed ran 2665, 2675, 2662, 2650, 2657, 2654, and 2667. That's 7 different lots, not 7 shots. Not all were chronographed on the same day, or even the same year, so I'd say they are very consistent.

Ray
Are your figures at 78' or muzzle?
 

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Doesn't seem to matter much. I use LC cases from the late 60s to 2012-2013. I do select all 100 cases from the same headstamp year. I make my handloads in batches of 100.

Projectiles seem to have optimal envelopes in regards MV. Get into the sweet spot MV range and one should see excellent results. I also ladder my loads in 0.2 gr increments while many others perform 0.5 gr ladders. This may explain why I see multiple loading with similar ES, SD and group size.
 
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Discussion Starter · #12 ·
good point gents, I have not actually run any "real" M852 through my weapon, just read the tech manual. So I guess I'll need to source a few boxes of real M852 to see what it does. I'm sure they are going for some ridiculous price now.
 

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If you can find any.

Best to just shoot for somewhere between 2550-2625 FPS and roll your own.
 

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Hi Phil,

my goal was to make an M-852 clone, Army tech manual specifies 2550 fps, so thats where I chose to stop, I figure they know more about the optimum velocity for the 168SMK than I do. I know they specify 42grs of IMR-4895, but I don't seem to need quite that much powder to get there. I also verified my chorno with commercial Remmington 150g ammo of known velocity, so I'm pretty confident that I'm at 2550 fps.
good point gents, I have not actually run any "real" M852 through my weapon, just read the tech manual. So I guess I'll need to source a few boxes of real M852 to see what it does. I'm sure they are going for some ridiculous price now.
Like Ray said, Uncle Sam measured there ammo at 78ft, so 2550fps +/- 30ft is a weeee bit misleading and many guys say well that's what's on the box of LC Match ammo so your wrong.

2640fps is about what you need too strive for, no need too hunt down a box of real LC Match ammo and chrono it just nab a box of Federals Gold Metal Match after all is a clone of the LC Match and chrono it.

However if you happy with the accuracy at the load level your at currently stick with it. Just don't be surprised if you have too add a click or two extra elevation for the 600yds line. You will really feel them fall/drop off at that distance when there loaded soft.
 

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Question: 10MMShooter (and others) What distance are you reporting? Are your screens set for a center reading at 10' or 15'? Or did you extrapolate from your screen distance to be actual muzzle velocity. I generally set screens to record velocity at 10'.... then just report that as the reading and not worry about actual muzzle velocity. When I report a velocity it is reported as "velocity at 10 feet".
I have shot tons of your stated load. except with a Fed 210M primer - works great at the reduced range matches. At 600 you will need a little more elevation than LC852 and the wind may be a fuzz trickier. I got great accuracy/precision with the load and from my old Douglas 1:12 the velocities were a fuzz slower than yours.
 
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