Can anyone enlighten me on the feasibility of loading 130gr or 150gr bullets for a subsonic load for a .270 ? Any advice appreciated.
.270 Win Subsonics
- Thread starter Longstrider
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What you going to use it for at a guess something close range as the idea is to make them spin and stay flat while retaining the energy?
Fast powder and heaviest bullet you can find
if you can source some 180gr you will be better off
if you can source some 180gr you will be better off
It is possible, certainly. The trajectory after eighty yards will be the same as a half brick. But it is possible. That said the best bullets will be those that are the softest so that they at least do have a chance to expand. There may be merit in looking at either full round nose types or for those with a plastic or metal top that initiates in impact bullet expansion. Indeed it may, finally, be a role for those polymer tip .277" bullets that at standard .270" WCF velocities used to be unwelcome on many estates. My only advice would then be to get to know precisely the impact points of the loading at the various distances you intend to shoot and learn those well.
Thanks for the pointers guys. My concern was that with just 9 or 10 grains of powder in the case would it be reliable ? Especially if the rifle was pointed almost vertically downwards and all the powder ran to the front of the case away from the primer. ?
(I'm sure that the more astute of you will now know what I want the subsonics for
)
(
(I'm sure that the more astute of you will now know what I want the subsonics for
)(
tackb
Well-Known Member
Thanks for the pointers guys. My concern was that with just 9 or 10 grains of powder in the case would it be reliable ? Especially if the rifle was pointed almost vertically downwards and all the powder ran to the front of the case away from the primer. ?
(I'm sure that the more astute of you will now know what I want the subsonics for
(
load a fresh primer into an empty case then chamber it and shoot it point blank at a piece of paper , when you see what it does you'll realise that the flame will have no trouble with going 50mm inside the case !
To be honest, I wouldn't try it myself. There's a (some would argue purely theoretical) risk of 'deflagration to detonation transition' occurring. Basically means that under certain conditions a shockwave can form in the empty volume and cause the powder to detonate rather than burn. Overall energy is the same, but these explosive brisance can feasibly destroy the rifle (and injure whoever's holding it)
Never been replicated in any tests
PO Ackley himself tried
As above
Modern powders and primers you have no issue igniting a 10% fill even aiming vertically down
PO Ackley himself tried
As above
Modern powders and primers you have no issue igniting a 10% fill even aiming vertically down
Who makes a 180 for the .270?
HonestJohn
Well-Known Member
I would be concerned about barrel obstruction, and then firing a second round. Doable, yes, safe?
when developing subs you work down to the powder charge not up......
Speer used to back a long long time ago make a 170 grain bullet. Except from its look this was with a tiny tiny area of exposed lead and seems to have been, maybe, intended for the same sort of game as a .30/06 220 grain bullet of similar design. So at subsonic velocities it would, unless it tumbled, most likely but only drill a clean but little more than calibre sized permanent wound.
So there's little that's not been done before somewhere at sometime where shooting is involved. You'll see images of it in old American yearbooks for reloading. Nowadays there's no reason someone doing small scale swaging couldn't make such on a bespoken basis at a cost. This below from 1960. I have been aged two and a half at the time!
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Bavarianbrit
Well-Known Member
There was a chap annealed over a candle .277 SST 150 grainers to get better terminal performance, he said it did not help on 130 grain bullets.
Link
Link
Barnes Original was a 180gr .270 bullet but I don't think they are made any more. Looks like there is a 180gr Woodleigh Weldcore in .270:
Bullet Specifications, Dimensions & Details (.264"-.333") - Woodleigh Bullets
Probably quite a tough bullet
I knew about the Barnes Original long discontinued; the Woodleigh is new to me.
timbrayford
Well-Known Member
Take care that you have sufficient case obturation.Thanks for the pointers guys. My concern was that with just 9 or 10 grains of powder in the case would it be reliable ? Especially if the rifle was pointed almost vertically downwards and all the powder ran to the front of the case away from the primer. ?
(I'm sure that the more astute of you will now know what I want the subsonics for
(
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