30 BR/302 Whisper - finally cracked it!

[Rikky Lee]

Guys

I have been away a while because the 30BR was not working and was wasting time, money and effort. The vertical at 100 yards was beyond frustrating.

But great news. I have broken down how to get it to work.

As long suspected Trail Boss powder is the key. Another shooter had worked out the load that worked for him after I had explained what I had done and what I had experienced as a result.

The load is 12 grains of Trail Boss in the 30 BR case under a 240 grain Sierra Matchking.

The velocity is about 1020 fps.

Have shot two groups. Both about 2.5 inches and round in shape - no vertical stringing.

The load of 12 grains fills the BR case into the neck. The key is to seat the 240 grain SMK long. My OAL for the cartridge is now 2.6 inches.

Have also shot fur with it, and the SMK appears to have tumbled as the exit wound was big and ugly.

[Hoser]

Any chance you played with Sierra 220s or Berger 230s?

[Rikky Lee]

I took out the 220 Hornady RN which is a flat base bullet and the 200 grain Lapua subsonic bullet. Both using the 12 grain load for comparison.

The 220 RN sits well in the case due to the flat base. 12 grains is too much and I got a supersonic crack and it was about 5 inches flatter at 100.

The 200 Sub should be the go to bullet due to design but it made a very strange sound through the air and it doesn't have a good bearing surface to hold the bullet in the case. Once again 12 grains is too much and this bullet might just shine with 10 grains.