6mm Ackley loads from Jeremy Brown

START WITH 6MM REMINGTON LOADS FROM A CURRENT LOAD MANUAL

5 shot groups unless noted - all groups shot with surplus H4831
BULLET
POWDER
CHARGE
VELOCITY 
 SPREAD
GROUP
  COMMENTS 
Speer 70 TNT Surplus H4831 50.0 3224 161 .777  
"   51.0 3297 72 .747  
"   52.0 3420 148 .765 chrono suspect
"   53.0 3503 72 .540 formed brass
"   54.0 3574 47 .250 4 shots
BAR 72 HP   49.0 3123 42 .658  
"   51.0 3394 121 .707 chrono suspect/formed brass
"   51.0 3416 45 .674 Unformed brass
"   53.0 3462 27 .662 4 shots into .207
Hornady 75 Vmax   52.0 3453 91 .731 3 shots, chrono suspect
"   52.0 3467 58 .600 3 shots
"   52.5 3552 30 .557 "
"   52.5 3503 55 .494 "
"   53.0 3538 40 .633 "
"   53.0 3547 61 .384 "
"   53.5 3610 49 .619 "
"   53.5 3632 62 .327 "
"   54.0 3642 26 .861 "
"   54.0 3649 98 .700 "
"   54.3 3706 10 .561 "
"   54.5 3721 65 .700 "
Sierra 85 BTHP   49.0 no data   .914 chrono misread
"   51.0 3275 35 .500  
Sierra 85 HP   52.0 3416 31 .982  
Hornady 87 HPBT   51.0 3322 26 .427 unformed brass
"   52.0 3417 46 .484 best group w/bullet
"   53.0 3511 68 .862  
             

Jeremy tried the Hornady 87 Vmax with several different charge weights, and reported that his rifle did not shoot them well. He also said the chrono was giving bad readings on several different range trips due to poor light conditions. Therefore, he suggested that several of the reported velocities are suspect. 

Here are some notes he send along with his data.

 The gun is a garden variety Win. M70 push feed long action. The barrel is a Pac-Nor, diam. 1.205", stainless, 1-12" twist. The stock, as you can see, is the Choate Ultimate Varmint. Scope is Leupold VariX-III 6.5-20X40, with Stoney point target knobs, fine duplex reticle. Trigger is tuned factory, breaks @14 oz., trigger work and chambering done by Rangemaster Gunworks, in Lebanon Oregon. Note extended base, and extended front ring, to get the scope far enough forward. I have a sort of long neck for my height, so end up a bit far forward on some stocks. The loading data is ALL using H4831, the old surplus stuff. Primers are CCI 200. Overall lengths, determined with Stoney Point OAL gauge, are nominally .010 off the lands. Most groups were shot over my car, using sandbags...I have a rack I put in the hitch reciever that allows me to shoot over the top, standing on the rack. It is an S-10 Blazer, and is very stable, as you can see. One or two days of the testing took place at real range, with real benches, but you can't tell it. I ultimately selected the 70 TNT's, with 54.0 H4831, but could just as well have chosen the 75 Hornady HP. Even the 75 V-Max was good, but few of the groups with 85-87 gr. bullets were very good, and they were better in unformed brass than in formed!

 

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