.300 blackout or something different as a handy farm rifle.

I'm looking at developing a subsonic 308 load.

What is "the right powder"? Do you mean legally ? Or the most effective powder for subsonic 308 loads ?
Hi,
Right powder for .243 Win is Trail Boss.
TB isn’t compliant but if you have some you can use it.
I’ve no experience with .308 at sub speeds so can’t comment, sorry.

For what it’s worth, when shooting 100 grain by .243 subsonic, at 100 yards I could collect most of my bullets off the surface of the range backstop. They were slightly deformed at the tip.
Never used them on live targets.
Cheers, Ken.
 
Hi,
Right powder for .243 Win is Trail Boss.
TB isn’t compliant but if you have some you can use it.
I’ve no experience with .308 at sub speeds so can’t comment, sorry.

For what it’s worth, when shooting 100 grain by .243 subsonic, at 100 yards I could collect most of my bullets off the surface of the range backstop. They were slightly deformed at the tip.
Never used them on live targets.
Cheers, Ken.
Probably be more effective loaded backwards.
IMG_20221023_151819.webpIMG_20221022_134415.webp
 
The other benefit the blackout has is the ability to shoot the 190 and 220gr subsonic bullets from nosler and Hornady which expand at subsonic speeds, standard bullets will not expand at subsonic speeds so the 100gr in 243 and the 150gr in 308 although quiet will not have the same effect on live quarry.
 
I'd be very cautious about shooting anything subsonic if you've got Neighbours near by. You're backstop needs to be absolutely on point. Twice I've known the hornady 190gr sub x rounds bounce after hitting there targets. One went through a fox...hit soft mud then bounced. Luckily I knew there was nothing but open field behind but a friend had a similar experience with 300 blackout. Shot into a bank and it must of hit a stone or something and proceed to bounce up the hill.
They expand alright but just be mindful its a big piece of lead that's being launched rather slowly.
 
I'd be very cautious about shooting anything subsonic if you've got Neighbours near by. You're backstop needs to be absolutely on point. Twice I've known the hornady 190gr sub x rounds bounce after hitting there targets. One went through a fox...hit soft mud then bounced. Luckily I knew there was nothing but open field behind but a friend had a similar experience with 300 blackout. Shot into a bank and it must of hit a stone or something and proceed to bounce up the hill.
They expand alright but just be mindful its a big piece of lead that's being launched rather slowly.
One advantage of shooting the same ground all your life is you can juggle things round to engineer shots that have the best backstops.
We always have a high straw stack at the end of the yard where foxes arrive from so I'm shooting down and have good soil as a stop.
Same out across the fields, trees planted 30 years ago are now providing me cover and were positioned in places where we could safely take shots from.
 
190 and 220gr subsonic bullets from nosler and Hornady which expand at subsonic speeds
I wouldn't count on either one expanding to the degree that has any meaning, especially on light targets. There surely have been lot variations and/or R&D after initial launch, and current ones might be better.

Rather make a jig and file (or machine) a bullet of your choice to large meplat flatnose. Or if you have soft extruded bullets like H&N, Berry's etc. available, make a jig and drill a hole, about 3.5mm is fine for 30cal. I use "hollow point" (actually small dimple) H&N, but if the bullet is pointed you need to file it flat first. Beware that even if light 125gr projectile loses 2/3 of weight as shrapnel, there's still the bottom 40gr that ricochets as any 22LR...
 
Shot into what, and terminal velocity?

Here's early Nosler shot into Clearballistics gel at 305m/s. Didn't find where other pics are.

IMG_20180809_204939.webp
 
The other benefit the blackout has is the ability to shoot the 190 and 220gr subsonic bullets from nosler and Hornady which expand at subsonic speeds, standard bullets will not expand at subsonic speeds so the 100gr in 243 and the 150gr in 308 although quiet will not have the same effect on live quarry.
But these are the same bullets (.30cal) that a .308 uses so why not homeload .308 subs with these and still maintain the superior supersonic ballistic with lighter faster bullets?

For anyone questioning subx bullets ability have a look at this:

 
300 HAMR possible to get all UK deer legal.
My 300blk does 2375 with 110gr 45cm barrel (1400ft/lbs).
 
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