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a bullet which is sufficiently stabilized at the muzzle will remain stable throughout its flight

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I wish you would tell that to my experimental SMLE sporter chambered for an approximation of the .375 JDJ cartridge. It shoots 270-grainers fine at about 2150, but the 285-gr Grand Slams I picked up at a close-out sale, at 2100fps, shoot 1-inch 3-shot groups at 50m (ghost-ring peep) but are sideways with 2-foot groups at 100m.

BTW the rifle is a marvellous scrub-gun, 7 lb, blonde epoxy stock-finish, brass buttplate, Yuck!! ...but a perfect knock-about or loaner. It has taken 3 buffalo and numerous big Territory boars with the 270-grain Hornady spire-point. Total cost AU$250! ...but that's another story!



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Marrakai
When the bull drops, the bullshit stops!
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www.marrakai-adventure.com.au

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two specific pieces of the puzzle which you could provide, and which I asked you for

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I don't think he wants any further advice

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Didn't ask for any in the first place!
...but thanks for offering mhb.

Perhaps I should clarify once again that there were NO puzzles here, nor problems to solve, simply an experience documented for the interest of others. The rifle in question is a marvellous scrub-gun, it WORKS, and doesn't need any improving. It was built with a 'free' barrel with the knowledge that it probably wouldn't stabilize 300-grainers, but that 270, 250, and even 235-grainers were available in that calibre, at increasing MVs, and a good working-load would be developed accordingly. The fact that the 285-grainer won't remain stable at longer ranges is entirely incidental and was offered simply to add to the corporate knowledge.

Thanks for the measurements on the Grand-Slam bullet CB, appreciated. Interestingly, the theoretical twist rate for that bullet, according to the Calculator I posted, is 16.9 inches. My barrel is unlikely to be slower than that! I'll measure it tonight.

This mole-hill mountaineering looks destined to continue....

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Marrakai
When the bull drops, the bullshit stops!
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www.marrakai-adventure.com.au

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Didn't ask for any in the first place.

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Indeed?

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I wish you would tell that to my experimental SMLE sporter... It shoots 270-grainers fine at about 2150, but the 285-gr Grand Slams.... are sideways with 2-foot groups at 100M.

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As I did not want to believe you were inviting me to address an inanimate object, I chose to respond as though you were speaking humorously, but did want the information. In addition, you had quoted a statement of mine as though you found it incredible, inaccurate, or inapplicable to the case you described. As I take some trouble to speak only from within the bounds of what I know, and never to tell anyone more than that, I endeavoured to explain the facts to you, with as complete supporting information as I thought necessary or useful. It is clear that you were not convinced that I spoke the truth. Very well. I am satisfied that the Unbiased Reader of this exchange can decide for himself whether the information I provided is pertinent, accurate, and useful in explaining the problems you reported.
As for deterioration of tone of the thread, I strongly deny having exceeded the usages of gentlemanly discourse, though recognizing (as coming from old, genteel Southern stock) that lack of sufficient care in one's utterances can also result in the issuance of a demand for satisfaction - either in the form of acceptable explanation and/or apology, or of the kind that calls for reference to the Clonmel Code, the services of seconds, and an early-morning appointment upon mutually-agreed grounds.
I have done you the courtesy (in gentlemanly fashion) of overlooking (up to this point) your cavalier dismissal of my statements and implied aspersions cast on my expertise - no more!
My parliamentaire(s) will call upon you or the representative(s) you shall name with my formal demand for immediate satisfaction, and a listing of the particulars in which I deem you have offended. As we have never met, such persons as I dispatch will, of course, be in possession of that documentation which will establish my Station (my Commission, Letters of Introduction, &c.) as a Gentleman: they will, of course, require no less from you.
If, as a Gentleman, you refuse satisfaction, (and cannot furnish satisfactory proofs of infirmity, prior undertaking under oath of honor to abstain from violence, or membership in some well-established pacifist sect, such as the Quakers), I will be obliged to immediately have you Posted in all the Leading Coffee-Houses and Gentlemen's Clubs - you would, of course, be Utterly Ruined and Barred from Polite Society Immediately and Forever.
If, on the other hand (and I do not wish to give offense, but, as I said, we have never met) you prove to be other than a gentleman, I shall be forced to the distasteful but necessary step of hiring Common Ruffians to Punish you in the Public Precincts, so that you and other Impertinent Fellows may, in future, be mindful of your Proper Place.
mhb - Mike; KP, CQ, PLO, SOP, PDQ, SOL, &c., &c.

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Sancho! My armor!

Edited by mhb (22/12/05 03:00 PM)

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