Thread: .308 subsonic load development.

Originally Posted by shooternz

Thanks for the order, I need the cash

I had best pay for them right now then

No rush I have plenty of baked beans to celebrate New Year with, I can't post them until Wednesday,
Have a great New Year

Anyone bother drilling out their primer flash holes for subsonic loads?

nope and I dont use magnum primers anymore either...trail boss goes off with a bang without alterations.

Don't do it all you do is stuff up your cases none of the powders used for subsonic loads require drilled primer holes or any other silly mods Magnum primers are way to hot for subsonic loads,
If you are using shotgun and fast pistol powders Dacron fibres as a filler are some times necessary to hold the powder against the back of the case, It is a no no with Trail Boss in a .308 case 8.0 to 8.5 grains
will give you around 1050fps the most I have tried was 12.0 grs accuracy went from 1/2" group to 5" at 50 metres.

I haven't played with this for years but when I did my experiance was the same - don't bother with drilling primer holes or magnum primers. The problem I had was the big pills didn't stabalise that well at subsonic speeds in the 308 barrel twist rate and the light pills took a worringly small amount of trail boss to get down to subsonic speeds. 95g Hornady XTP in 30 cal (outdoor supplies have them) is a great projectile thats designed to expand at those speeds being a pistol projectile but it was down around a half full case which made me worry about detonation so I think you are better off with the cast projectiles.

My current plan is to build a 9MM AR15 and then load them down a bit to get subsonics.

I re visited my subsonic loads today. Using 150gn hollow points. 8 grains trail boss gives me 1078fps average. They group well at 50meters.
This is my 3year old son shooting them this afternoon. No recoil and about same noise as a 22lr.


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I just brought some to try in my new bergara single shot. Really keen to get the kids into it and this will make it easier. Will post up results when we shoot a few deer with them

Originally Posted by Manu

I re visited my subsonic loads today. Using 150gn hollow points. 8 grains trail boss gives me 1078fps average. They group well at 50meters.
This is my 3year old son shooting them this afternoon. No recoil and about same noise as a 22lr.


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Was there meant to be a video here mate?

Originally Posted by Gibo

Was there meant to be a video here mate?

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Shit yeah there was.


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Any advise on how to upload video?


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Originally Posted by Manu

Any advise on how to upload video?


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I think you can attach a short one useing tapatalk or otherwise upload to utube/v emo etc and share link.

https://youtu.be/AvB0kmqckvo


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I got all keen reading this so brought some cast bullets from Robert and loaded them up (8.5gr Trail Boss). Was originally intending to smoke a goat just to test terminal performance but opportunities didn't line up. Instead headed to a DOC block th is morning, walked in in the dark and daylight saw me stalking a likely area. Got onto a young red spiker at about 40m, body shot (read: a bit far back) and the moose was down within about 10 m, finishing shot to the swede from 4m and it was all over.
Overall very happy with the cast projectiles, given a sensible range and shot placement they are good to go. Well mushroomed projectile, will upload pic tomorrow.