The UK's Finest Independent Forum for Shooters and Gun Owners. Est 2010.

Hmmm, shorter for subsonic? That's a fly in the ointment.

Maybe we'll have to look at increasing the mass of subsonic round by using a different bullet profile and composition. Let's say standard copper jacketed, long, streamlined bullets for supersonic and round nosed, cast lead for sub sonic. We need the subsonic rounds to be as heavy as possible...

meles meles wrote:Hmmm, shorter for subsonic? That's a fly in the ointment.

Maybe we'll have to look at increasing the mass of subsonic round by using a different bullet profile and composition. Let's say standard copper jacketed, long, streamlined bullets for supersonic and round nosed, cast lead for sub sonic. We need the subsonic rounds to be as heavy as possible...

Why as heavy as possible?

Why not use one bullet and just vary the load? I used 168 gn A-Max bullets (7.62) for both subsonic and normal loads.

I've attached an excel spreadsheet for determining twist rate - ballistic tipped bullets throw the results a bit, but it'll give you rough idea.

Sandgroper wrote:
Why as heavy as possible?

The slow bullets will be very susceptible to wind, hence the heavier they are the bigger the p**f needed to knock them off course...

meles meles wrote:

Sandgroper wrote:
Why as heavy as possible?

The slow bullets will be very susceptible to wind, hence the heavier they are the bigger the p**f needed to knock them off course...

Depending the bullet you might not need 'as heavy as possible' to counter the wind, but I've only tinkered with subsonics and don't know all the ins and outs.

I use 168 Amax supersonic and a 180g flat base round nose for subsonic , both shoot well ?

Sandgroper wrote:
Depending the bullet you might not need 'as heavy as possible' to counter the wind, but I've only tinkered with subsonics and don't know all the ins and outs.

We'll let Gallileo and Newton debate the intricacies of mass if they must in the horizontal and vertical planes, and Descartes can try resolving it for them. In practice, a heavy bullet is best for minimising wind drift and won't hit the ground sooner than a light one...

meles meles wrote:

Sandgroper wrote:
Depending the bullet you might not need 'as heavy as possible' to counter the wind, but I've only tinkered with subsonics and don't know all the ins and outs.

We'll let Gallileo and Newton debate the intricacies of mass if they must in the horizontal and vertical planes, and Descartes can try resolving it for them. In practice, a heavy bullet is best for minimising wind drift and won't hit the ground sooner than a light one...

:cool2:

Aspirin sales always go up in our vicinity...

meles meles wrote:Aspirin sales always go up in our vicinity...

Maybe if you didn't try to be a such a smartar*e it wouldn't happen.

The mathematics is easy.

The son of the squaw on the hide of the hippopotomus is equal to the sons of the squaws on the other two hides.