L8 and Sterling/Charnwood 7.62 conversions- Harmonics and Mathematics

[Peter Laidler]

That's interesting TBone but I suspect that there must be a lot more to it than that. I'm not a ballistician but my understanding of the trial paperwork was that the harmonics of the 7.62mm NATO round (as was then.....) was such that the disasterous accuracy might be solved if the barrels were muzzle bound. This would alleviate the problem which was that the muzzle vibrations would whip vbiolently and it was this whip that sent the bullets, well......, anywhere really. Centre beding would just exaggerate the condition..........yes? Modern barrel steels might be the Lithgow answer.

What say you ENSCI? Any ideas

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[jss]

This would alleviate the problem which was that the muzzle vibrations would whip vbiolently and it was this whip that sent the bullets, well......, anywhere really

Simplistic I know but I was thinking that a fast burning powder with a light projectile might reduce that effect, pressures permitting of course!.

[Rusty.303]

I have owned two No4 .308 conversions,
The first rifle is a Savage with the Sterling .308 conversion and what I believe to be a standard profile barrel.
The second rifle is a Longbranch with a Lithgow .308 conversion and a heavy barrel.
I am not an expert on the different bedding techniques, however both these rifles appear to be floating for at least the front half of the barrel.
Both these rifles shoot very mediocre with mild loads.
I wish this wasn't the case however as the load gets to the point where it's hot both of these rifles shoot with much greater accuracy.
Cheers