I finally got the .375 CT conversion up and running on my HTI. Yesterday's shooting conditions were as follows: 21.7-23.5 degrees F/26.67 inHG/ 3586' ASL/DA=1365-1780/70-80% humidity with intermittent snow and fog. Winds at 0-3MPH varying in direction.
I started out by confirming zero in the .50BMG conversion and testing the chrono. My first clean cold bore .50 BMG shot was almost dead on, then the group moved +1/L1 moa. I re-corrected for this.
After re-zeroing my turrets I switched over to the .375 CT, fired one last round of .50 so that I could accurately document the POI shift between conversions. I then fired 3 rounds of DTM factory ammunition using the center bullseye as aiming reference.
As you can see, there was a POI shift of about -3/L3 and about a 1.5" group. Both Russ at DTA and Orkan advised not getting too excited if the 352gr CE solid didn't group at 100yds initially. This group could have easily come from me slapping the trigger after 11 rounds through "the Punisher" aka .50BMG, and being cold. Also, the additional bulk of the balaclava made it a little harder to obtain proper cheek weld, and sight picture.
After 9 rounds of .375, things settled in a little better:
This is three rounds of 352gr. CE MTAC L-09/virgin Bertram Brass/132.5 grains Retumbo/Fed GM215M/4.444" COAL/ Avg. 3054 fps/ ES of 9 FPS
Always trying to quit on a high note, we packed up, drank some hot choclate, and drove down to the steel range. Unfortunately, the only steel target up was the 550 yd plate (500, 600, 720 were all in for repair). I was out of handloads, so I just shot DTM facotry ammo. DA had come up to 1850 and temp was holding at 23.4 F. Both AB and Kestrel Horus recommended +7.1 MOA/R.2. Dialed +7.25/R.25 and was rewarded when the disc spun a complete revolution over its hanger. Fired two more, and was out of ammo for the day.
My plan is to load some more 132.5/4.444" ammo, re-chrono, and zero, then stretch its legs a little.
Reloading equipment is as follows:
RCBS Ammomaster .50 BMG press, RCBS chargemaster, Viersco dies
I started out by confirming zero in the .50BMG conversion and testing the chrono. My first clean cold bore .50 BMG shot was almost dead on, then the group moved +1/L1 moa. I re-corrected for this.
After re-zeroing my turrets I switched over to the .375 CT, fired one last round of .50 so that I could accurately document the POI shift between conversions. I then fired 3 rounds of DTM factory ammunition using the center bullseye as aiming reference.
As you can see, there was a POI shift of about -3/L3 and about a 1.5" group. Both Russ at DTA and Orkan advised not getting too excited if the 352gr CE solid didn't group at 100yds initially. This group could have easily come from me slapping the trigger after 11 rounds through "the Punisher" aka .50BMG, and being cold. Also, the additional bulk of the balaclava made it a little harder to obtain proper cheek weld, and sight picture.
After 9 rounds of .375, things settled in a little better:
This is three rounds of 352gr. CE MTAC L-09/virgin Bertram Brass/132.5 grains Retumbo/Fed GM215M/4.444" COAL/ Avg. 3054 fps/ ES of 9 FPS
Always trying to quit on a high note, we packed up, drank some hot choclate, and drove down to the steel range. Unfortunately, the only steel target up was the 550 yd plate (500, 600, 720 were all in for repair). I was out of handloads, so I just shot DTM facotry ammo. DA had come up to 1850 and temp was holding at 23.4 F. Both AB and Kestrel Horus recommended +7.1 MOA/R.2. Dialed +7.25/R.25 and was rewarded when the disc spun a complete revolution over its hanger. Fired two more, and was out of ammo for the day.
My plan is to load some more 132.5/4.444" ammo, re-chrono, and zero, then stretch its legs a little.
Reloading equipment is as follows:
RCBS Ammomaster .50 BMG press, RCBS chargemaster, Viersco dies
. Keep me posted on this Walt, I am very interested in how yours runs.
