Lee 309-230–BTF

[Maxjon]

I know it may have been mentioned, but are we drilling flasholes out to 9/64" for subsonic cast loads? I have been, but not sure it's of much benefit??

 

[Spindrift]

I have never modified the flashholes in any way. So, I have never done any comparative tests between drilled and unmodified flash holes.
I have found, however, subsonic loads with cast bullets/normal brass to be completely unproblematic. I have never found motivation to drill the flash holes, since it wouldn’t solve any problems for me. However, I shoot mostly loads with normal/heavy bullet weights. And I alternate between subsonic, and more potent loads.

If you’re loading genuine «squib» loads, it might be useful. Another strategy to avoid increasing headspace in brass for squibs, would be to shot loads every once in a while with sufficient pressure to obturate the brass. Like «10grs unique», or «16grs 2400», or something like that.

 

[fiver]

I don't drill them out per say, but all of my rifle brass does go over a flash hole uniforming/de-burring tool.
sometimes it cuts some out, sometimes it don't.

 

[Maxjon]

Very interesting....Been shooting Subsonic 308 cast for years. Not sure if this cruise missile will stabilize in my 12T .308 barrel. But I may just have to try it!

 

[mr.skrimps]

This thing defied expectations~ shot from a new 300 b/o build and barrel that had never been shot today. @ 75 yards Shot 5 factory rounds first ~ s&b 150 supersonic all high about 1.5 inch group. Switch to the lee 309 230 tl, lake city brass converted, 7.7 grain a#9, basic magpul flip sights~ bullseye, next 4 followed. Couldn’t be happier. This thing is a mixed bag in internet land but it works for me. Didn’t make that many cause of all the polarizing reviews- but ima change that.

It’s definitely subsonic though I did all my shooting without any kind of silencer, 16” barrel.