What's the est. G1 and G7 BC on that hunting version? Waiting for Bryan to test?
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I have a pretty good idea of what the BC of the hunt bullet depicted in Argorn50's post is. When a core is used, the weight/balance is virtually identical to the Match projectile, and the Match projectile hits ~.2 mils lower than the 300 grain Scenar at 1,200 yards, based on his recent testing at Camp Atterbury.
The revised projectile has a higher BC than the Lapua, but I would prefer that Bryan present those results in the clear, methodical, manner to which we have all become accustomed.
Your comment shows how little I know about terminal ballistics.
I was considering this test to be a failure because of excessive mass loss. It is the reason that I moved to a bonded, progressive resistance core.
As mentioned in a prior post, the engineering challenge, with tellurium copper, is moderation of explosive expansion. Cory Trapp, of The Gunsite Academy, will be publishing much more professionally structured expansion test results prior to projectile release. Low velocity expansion is really a non-issue.
We had a long drawn out discusssion about terminal balistics and testing using different media such as wet newspapers, etc., almost a year ago. The bottomline is that the only real way to test a bullet for it's affect on flesh and bone is to shoot it through flesh and bone. Other mediums can give you a general idea what the bullet may do, but not necessarily at what speeds it will expand or how far it will penetrate or how stable it might be. Bullets do not penetrate paper as deeply as they do flesh and may expand at lower velocities in paper.
Actual velocites and distances on flesh make the best tests for stability and other factors. I have noticed from some long range kills made by LRH members, to show bullet expansion below advertized velocities at longer ranges. Specifically with NAB's and possibly SMK's and Bergers. I haven't heard or read of a reason for this phenomena and wonder if heat friction over a prolonged TOF may *soften* the jacket.
I wouldn't call loosing a petal a failure, depending on what the bullet did after loosing it. The GS bullets are designed to loose their petals at higher velocities and form a slightly mushroomed front to continue penetration and permament wound channel. I would think that the petals would act like shrapnel and cause more damage.
Stability is important to ensure proper penetration in the intended direction of travel through the vitals.
Last edited by MontanaRifleman; 06-26-2009 at 12:15 PM.
I have noticed from some long range kills made by LRH members, to show bullet expansion below advertized velocities at longer ranges. Specifically with NAB's and possibly SMK's and Bergers. I haven't heard or read of a reason for this phenomena and wonder if heat friction over a prolonged TOF may *soften* the jacket.
Speaking for Berger, the exact low end velocity at which the bullets will work is not a precise enough number to allow for closer impact velocity recommendation. This is especially true when talking about several different calibers and weights being used on a wide variety of animal sizes.
We recommend 1,800 fps as a minimum impact velocity because we know that all our VLD Hunting bullets will work at this velocity. It does not mean that a given bullet can't work at a lower velocity but such is the nature of recommendations provided to a large population of users.
Consider how loading manuals list information that is comfortably on the conservative side. Also consider that our twist rate recommendation must account for all environments and potential muzzle velocities. Many know that the exact twist need to stabilize a given bullet in a given rifle at a specific atmosphere is likely different than our recommendation but our recommendation will work also.
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