was breaking in a new 8 twist McGowan barrel today

[ig25]

So put a new barrel on my 243 so I could 105 amax or barnes match burners.
my 1st 4 shots were some 62 grain varmit grenades.1/4" group really? I figured at best they would come apart.
next the MB give me a 4 shot 3/4" group. Last the amaxs. To 3 shot groups and my last shot luckly went in the bullseye.
using retumbo .02 off the lands.
VG's have no idea on powder but were .01 jam.
I am laughing at my self. I went from a 10 twist to the 8 to get away from Light bullets and go after a 1000 yard paper punch or PD's.

So to my question.
What are you guys and gals seating depths on the 105's

 

[ig25]

So put a new barrel on my 243 so I could 105 amax or barnes match burners.
my 1st 4 shots were some 62 grain varmit grenades.1/4" group really? I figured at best they would come apart.
next the MB give me a 4 shot 3/4" group. Last the amaxs. To 3 shot groups and my last shot luckly went in the bullseye.
using retumbo .02 off the lands.
VG's have no idea on powder but were .01 jam.
I am laughing at my self. I went from a 10 twist to the 8 to get away from Light bullets and go after a 1000 yard paper punch or PD's.

So to my question.
What are you guys and gals seating depths on the 105's

Starting with 105 match burners.
So I am going with 10 rounds at .005 jump
10 rounds .010 jump and 10 rounds .015 jump.
Will try the same with 105 amax
All with 49 gr of retumbo
26" McGowan barrel

 

[ig25]

Starting with 105 match burners.
So I am going with 10 rounds at .005 jump
10 rounds .010 jump and 10 rounds .015 jump.
Will try the same with 105 amax
All with 49 gr of retumbo
26" McGowan barrel

All 10 shot groups and all 3136fps avg 37 deg
105 mb .005 jump 462 group
.010 jump .645 group
.015 jump 1.64 group
105 amax ..005 jump .989 group
.010 jump. .615 group
.015 jump. .1.2 group