Remarks:
For this test, I have switched my optic to a Nikkon P Tactical with fixed 3x zoom. It has a very clear picture and I am trying to rule out accuracy problems due to the optic as this is a known good scope. With that, I expect the group sizes to be a little larger.
Objective:
This rifle is my primary hunting rifle, especially for deer. For this setup, my goal is to develop a hunting load that is effective up to 200+ yards. With this bullet, I need to achieve a MV of at least 2,200 fps to ensure the bullet will deliver at least 1,000 ft/lbs of energy past 200 yards. With this load work up, I’m looking to balance max accuracy with max velocity.
Conditions:
- Date: 10/7/22
- Temperature: 80F
- Wind: 0-5mph
Firearm:
- Barrel: PSA 12” 1:7 Twist
- Upper: PSA
- Lower: PSA
- Lower Parts: PSA
- Trigger: Larue MBT-2
Components:
- Bullet: Barnes 120 gr TTSX BT – G1 B.C.: 0.412
- Powder: Vihtavuori N-133
- Primer: CCI #41
- Brass: Hornady
- Dies: Lee Pacesetter 3-die set
- Chronograph: Caldwell Ballistic Precision
Measurements:
- Case Trim Length: 1.510
- C.O.L.: 2.235
Load / Model Data:
- Charge Data
Results:
- 24.0 Grains
- 24.5 Grains (This is the load I would use)
- 25.0 Grains
- Optimal Ballistics Table
- Optimal Bullet Drop
Summary:
I am happy with the results from this powder. I was able to gain nearly 100fps over the 123 HRN SST bullet using the same 24.5gr of N-133. At 2,225 fps this load is effective out to 200 yards with no problem and accurate enough to make precise shot placements. There were no pressure signs on my brass but this load is sufficient for what I need to do with it, so I won’t explore higher loads at this time.