Lokichoki
Member
- Joined
- Nov 2, 2016
- Messages
- 297
Breaking in a new barrel on a dpms Oracle 5.56 1-9 carbine I am on the 2nd 5 shot group part of the break in. I know it's probably not necessary to break it in but I have 2 new oracles and just want to see if there will be a difference, anyway I loaded a batch of federal brass at first (same info below but at 24gr IMR4320) and they ran an average of 5 at 2474fps dry bore. This second batch was this
Created: 02-23-2017 16:00:04
Description: 223 rem 60gr hornady sp (#2270) imr4320 (lot1031215 5232) 24.5gr 2.20col
Notes 1: slight crimp
Notes 2: no pressure signs good feed
Distance to Chrono (FT): 8.00
Bullet Weight (gr): 60.000
Altitude (FT): 0.0
Temp: 72 °F
BP: 29.85 inHG
Shots
# FPS FT-LBS PF
5 2540 0.00 0.00
4 2553 0.00 0.00
3 2524 0.00 0.00
2 2547 0.00 0.00
1 2560 0.00 0.00
Average: 2544.80
StdDev: 13.77
Min: 2524
Max: 2560
Spread: 36
True MV: 2544.80
Shots/sec: 0.33
This seems slow to me the Lyman manual used a 24" and 20" barrel on there .223 REM loads but I don't see on the data which barrel was which in comparison seems odd and they stated for 60gr v-max at starting load 23.3 was at 2663 fps (I know it's not the same bullet!) Can anyone give me there thoughts, thanks and God bless,
lokichoki
Created: 02-23-2017 16:00:04
Description: 223 rem 60gr hornady sp (#2270) imr4320 (lot1031215 5232) 24.5gr 2.20col
Notes 1: slight crimp
Notes 2: no pressure signs good feed
Distance to Chrono (FT): 8.00
Bullet Weight (gr): 60.000
Altitude (FT): 0.0
Temp: 72 °F
BP: 29.85 inHG
Shots
# FPS FT-LBS PF
5 2540 0.00 0.00
4 2553 0.00 0.00
3 2524 0.00 0.00
2 2547 0.00 0.00
1 2560 0.00 0.00
Average: 2544.80
StdDev: 13.77
Min: 2524
Max: 2560
Spread: 36
True MV: 2544.80
Shots/sec: 0.33
This seems slow to me the Lyman manual used a 24" and 20" barrel on there .223 REM loads but I don't see on the data which barrel was which in comparison seems odd and they stated for 60gr v-max at starting load 23.3 was at 2663 fps (I know it's not the same bullet!) Can anyone give me there thoughts, thanks and God bless,
lokichoki