Remarks:
To overcome feeding issues with the 350 Legend, I changed the buffer to an H1 and installed a Wolff Extra Power Carbine Buffer Spring. I haven’t had any feeding issues since doing this..
Objective:
For this setup, my goal is to develop a hunting load that is effective up to 150 yards. With this bullet, I need to achieve a MV of at least 2,115 fps to ensure the bullet will deliver at least 1,000 ft/lbs of energy at 150 yards. With this load work up, I’m looking for the most accurate load that achieves the desired MV
Conditions:
- Date: 5/9/22
- Temperature: 75F
Firearm:
- Barrel: Faxon Gunner 12.5” 1:16 Twist
- Upper: Aero Precision XL
- Lower: Ruger
- Lower Parts: CMMG
- Trigger: Ruger Elite 452
Components:
- Bullet: Hornady 170 gr SP – G1 B.C.: 0.215
- Powder: IMR 4227
- Primer: CCI #41
- Brass: Winchester
- Dies: Lee Pacesetter 3-die set and Lee Factory Crimp Die
- Chronograph: Caldwell Ballistic Precision
Measurements:
- Case Trim Length: 1.700
- C.O.L.: 2.245
- C.B.T.O: 1.725
Load / Model Data:
- Gordons Reloading Tool Data
- Charge Data
- GRT Pressure Curve
- Expected Ballistics Table
- Expected Bullet Drop
Results:
- 25.0 Grains
- 25.5 Grains
- 26.0 Grains
- 26.5 Grains (This is the load I would use)
- 27.0 Grains
- Optimal Ballistics Table
- Optimal Bullet Drop
Brass:
Summary:
I didn’t quite reach the velocities I was looking for but I am happy with the accuracy of this load. I had issues with my chrono reading some of the groups so I am estimating that @ 26.5 grains that the muzzle velocity is about 2,040 fps. At this velocity, this bullet is carrying 1,000 ft./lbs. of energy to just under 150 yards, with 1.2 MOA groups, I will take this. This is the most consistent powder across tested charge weights that I have seen so far with this gun.