Thread: Help needed for 308 subsonic load

you will end up somewhere between 8 and 6 grns of trailboss behind those 151s.....in the .308 they are good,very good think a .22lr power point subsonic but 5x bigger/heavier cause that is pretty much what you get.

I use 8.5g trail boss and either 151g or 170g cast Bullets,the 151g are a hollow point and expands a little the 170g just pencil on thru,only really good for small game at subsonic speed .

Originally Posted by The bomb

I use 8.5g trail boss and either 151g or 170g cast Bullets,the 151g are a hollow point and expands a little the 170g just pencil on thru,only really good for small game at subsonic speed .

8.5 grains of Trailboss had the 151s going at 1168fps in my 308, so still supersonic, I had to go below 8 grains to be subsonic.

I'm running 7.1 gn trailboss for the 151 hp, gives 1025 fps at 15deg C, remember that's for my dies.
I'm running a 1:8 twist.
Get a chrony, it saves guess work and heart ache. If you're in the BOP happy to lend you mine.
If you hunt deer, get some lehighs from dean maisey.
Good luck.

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Originally Posted by kiwiswede

I'm running 7.1 gn trailboss for the 151 hp, gives 1025 fps at 15deg C, remember that's for my dies.
I'm running a 1:8 twist.
Get a chrony, it saves guess work and heart ache. If you're in the BOP happy to lend you mine.
If you hunt deer, get some lehighs from dean maisey.
Good luck.

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hows the results? did it expand well? would love to use ur chrony but im at AKL

Originally Posted by lmlalong

hows the results? did it expand well? would love to use ur chrony but im at AKL

Load full case and work down till all of a sudden it goes quiet.

Thanks for the pointers team. Sorry for hijacking the thread.

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no it wont expand...and all the added weight will do you no good if it just sails on through the other side...the 151s penertrate enough as it is....

As @mickyDuck said, no point going heavier. 151hp expand a little, but generally punch through, there are some photos somewhere on the forum. If you are going for deer dont much around and use lehighs 168 CF. They are like little grenades. Many dont use as they have 'slow' twist rate barrels . You need 1:8 for lehighs. There have been some who run a large projectile and use the tumbling. I dont think you could do this with 1:8".

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I forgot to mention, I dont think you can go lighter than ~150gn with 308 Win as you'll end up less than 1/2 your case full and risk double detonation. I have been told this is around 6.5gn for trail boss. I have never tested/measured. Someone else here may know more about this.

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Originally Posted by kiwiswede

I forgot to mention, I dont think you can go lighter than ~150gn with 308 Win as you'll end up less than 1/2 your case full and risk double detonation. I have been told this is around 6.5gn for trail boss. I have never tested/measured. Someone else here may know more about this.

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Shot around 400 90gr xtp and 5.7-7gr trailboss in three different rifles with zero issues and good velocity consistency for subs.

Originally Posted by veitnamcam

Shot around 400 90gr xtp and 5.7-7gr trailboss in three different rifles with zero issues and good velocity consistency for subs.

Good to know @veitnamcam. What were you using the 90gr xtp on? Thanks.

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Originally Posted by kiwiswede

Good to know @veitnamcam. What were you using the 90gr xtp on? Thanks.

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Mostly experimenting but shot a couple of pigs and a couple of goats with them...never shot a deer with them.

151 cast HP travelling lengthwise from a good size billy about 40 yards at mouse fart speed. They usually make 2 holes so you won't find too many. Chest shots can be slow killers if you only hit one lung. I found animals can behave a bit like when hit by an arrow. Head/neck shots are just like with standard rounds if you hit the brain or spine. @kiwiswede @lmlalong

Guys thank you all for all the helps.

here is what im gonna do after everyone's help:

subsonic: 151 cast. Trail Boss(later on will move to a heavier cast )

supersonic: Sierra #2180 220GR jacketed RN. AR2206h/AR2208(later will move to Noslers#30181)