Range trip #5 with 6BR...Getting better.

[MDM]

Based on my last session, I settled on two final loads and set out to test seating depths. I tried to follow some advice and removed my sling studs from the stock. The 107 smk has gotten real consistent. The 105 vld seems more picky, but shows some real promise.

Here is the first load...30g Re15 with 107 smk. I started with a .025 jump and worked up to a .015 jam in .005 increments. Looks like I will go with the .25 jump as this has been consistently good load the last two trips. I feel like I need to try a .030 jump, because I haven't tried it yet.

The next load... 29.7g Varget with 105 Berger VLD hunting bullet. This was not so good, but got real tight all of the sudden when jumped .011. Is this typical when the sweet spot is found? This load may warrant some more testing. I started out jamming at .005, .010 and .015, but these seemed to prefer the .011 jump.

I'm going to try the two best loads out at 3-400yds later this week.

 

[tclaunch]

Pressures change when jamming vs jumping, so I`d consider going to a straight charge of 30.0 grains Varget with the .011" jump. Tweeking powder charge can reduce verticle. You have but just a small amout there. You are off to the races!!

I do not recall if you tested 30.5 RL 15, but its a good load as well. If you go back and mess with RL15 try incremental powder adjustments of .2 go from 30 to 30.8 and see how things go. Try this with the .011" jump also.

 

[6BRinNZ]

Hi MDM,

your progress is looking good.

I have just had a rifle built in 6BR that is throated for the longer projectiles (my previous was throated for 75 v-maxes). The other rifle I built the load and zeroed on a Bipod, however this time I will take Mark s advice and build the load from proper rests - so I will be embarking on the same path as you shortly. So - just wondering if these groups are shot at 100yrds?

Thanks

Wayne

 

[MDM]

yes, 100 yds.