.300 Blackout

I use IMR 4227 for both sub and super. Sub gives me 1040 ft/sec velocity, while the supers are around 1984 with a single-digit Standard Deviation. Haven't figured out how to get better SD's in subs, currently around 20, but I don't really care much about SD's in subsonic ammo since I only use those in an AR pistol and always at close range. For subs, the group size at 25 yards matters way more than any low SD. Only on the second firing, and taking my pile of fairly new Starline brass all the way through a firing before starting on the next.

Sub load: Starline Brass, 190gr Hornady Sub-X over 8.2gr's of High Gun. MV of 1055fps per my Lab Radar.

10.5' barrel

Supers: win 296, sig brass, 125 sierra tgk, 19.5 @2.250
Subs: vvn110, Barnes brass, 208 eld, 9.7 @2.250
16” Douglas in an ar.
Wolf msrp

20gr H110, Hornady 110 V-Max @ 2.1"
12.2gr A1680, Berry's 220 @2.1"

Love all the info, it would be great to list barrel length and gun type.
I shoot a 8" AR-15 and a 10.5" bolt action, will post some load data soon.

I'm helping a buddy setup a rig for deer hunting, here in our state of suck it is the only legal bottleneck cartridge legal to use as well as in a bolt action setup...we are deep behind enemy lines as the gas guns are currently in limbo. I personally am not a deer hunter but tinkering with handloads is my cup of tea.

Being on a somewhat budget we built it off a Savage 110 action and a 9tw 24" Bartlein in a Bravo, with the intention of sticking only with strictly supers, once again...suppressors are also a no go.

Only tested one charge weight, powder and bullet as a a quick "break in" and to get optic somewhat zeroed for actual load development.

18.8 gr H110 with a 110 vmax @ 2.1 yielded an avg of 2460 fps, I am suspecting he could reach 2600 fps towards the top of charge ladder. The 24" barrel is producing much higher speeds vs the test lengths used in the load manuals as suspected. Will report back as move up into the 125gr and possibly 150 gr.

9" BCM

110 V-Max Factory 2130 ft/secs SD 8

110 V-Max Win 296 2240 ft/secs SD 18

115 Berger FB W 296 2088 ft/secs SD 12

125 Nosler BT Lil Gun 2070 ft/secs SD 34

155 Sierra (2155) Lil Gun 1862 ft/secs SD 10

175 SMK AA 1680 1070 ft/secs SD 26

208 A-Max AA 1680 1031 ft/secs SD 12

220 Sig Factory 1035 ft/secs SD 14

220 Lapua IMR 4227 1031 ft/secs SD 4 (Favorite for quiet)

Working with my second 9" BCM and it is slightly faster, but prefers Lil Gun to W 296 with supers.

110 V-Max load