Loading 308 subsonic
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Re: Loading 308 subsonic
You need a chrono and a little time. I think most everyone uses trail boss. I would start at 8gr and move up. You want to be as close as you can to supersonic without crossing over. It is kind of trial and error
You need a chrono and a little time. I think most everyone uses trail boss. I would start at 8gr and move up. You want to be as close as you can to supersonic without crossing over. It is kind of trial and error
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747 Posts
Re: Loading 308 subsonic
Pointy boolits don't work well. Get you some 30/30 boolits. So far they have worked well for me. Flat or round nose and flat base.
Pointy boolits don't work well. Get you some 30/30 boolits. So far they have worked well for me. Flat or round nose and flat base.
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1,753 Posts
Re: Loading 308 subsonic
No fillers needed with trailboss. Its extra fluffy. Looks like little doughnuts. We are using 180 gb
No fillers needed with trailboss. Its extra fluffy. Looks like little doughnuts. We are using 180 gb
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747 Posts
Re: Loading 308 subsonic
I got some 170gr Oregon trail silver alloy from midway. They work great. They have gas checks so you can shoot supersonic too. No key holing out to 100yards. They look funny in a 308 win case.
I got some 170gr Oregon trail silver alloy from midway. They work great. They have gas checks so you can shoot supersonic too. No key holing out to 100yards. They look funny in a 308 win case.
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560 Posts
Re: Loading 308 subsonic
always start high and use a chronograph so this doesnot happen "start high only when loading subsonic"
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You need to start high and work down with a chronograph "say 11 grains " it willnot be too much pressure with trailboss. What twist barrel and what grain pills are you using?Dock Rocker said:
always start high and use a chronograph so this doesnot happen "start high only when loading subsonic"
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1,753 Posts
Re: Loading 308 subsonic
Never had a problem with any of the guns we have tested at 8gr. That is using twists from 1:12 (sub optimal) to 1:8 using 180 gr and up to 220. We have not stuck one yet.
You should always check your barrel, I understand that. The reason I say go up is to get it to a speed as close to supersonic as conditions will allow. As conditions change you will have to alter your load to stay keep as much speed as you can. 8gr has never left one in the barrel so from my experience that is very safe place to start. Do I have a problem starting at 11gr and working down? No.
Never had a problem with any of the guns we have tested at 8gr. That is using twists from 1:12 (sub optimal) to 1:8 using 180 gr and up to 220. We have not stuck one yet.
You should always check your barrel, I understand that. The reason I say go up is to get it to a speed as close to supersonic as conditions will allow. As conditions change you will have to alter your load to stay keep as much speed as you can. 8gr has never left one in the barrel so from my experience that is very safe place to start. Do I have a problem starting at 11gr and working down? No.
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1,753 Posts
Re: Loading 308 subsonic
I do want to temper what I said above. If this is your first time to try this do as TitleIIredneck says. Start hot and work down to subsonic. Check your barrel after every shot. I dont want you to stick one and have your gun blow up on you.
I do want to temper what I said above. If this is your first time to try this do as TitleIIredneck says. Start hot and work down to subsonic. Check your barrel after every shot. I dont want you to stick one and have your gun blow up on you.
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7,489 Posts
Re: Loading 308 subsonic
I have been loading pulled M118 (175gr SMK) with 9.5gr Trailboss in LC brass, they are very quiet thru my R700AAC-SD. 10 twist.
I have been loading pulled M118 (175gr SMK) with 9.5gr Trailboss in LC brass, they are very quiet thru my R700AAC-SD. 10 twist.
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