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quote:

Originally posted by jeffeosso:
Dan,
now that you are NOW mixing apples to blue... you didn't talk about different bullets and different jackets when you said you got spikes with the same loads and the same bullets... you said your got spikes FROM the same load... guess you'll keep changing the parameters till you can get it right and then you can say "ah"..




jeffe

Jeff,

I did get pressure spikes from the same loads. And it has happend with Hawks in 3 calibers.

And I got the results posted in the examples above, which are intended to show you that not all pure copper behaves exactly the same way every time. Nor is all water the same (bath water versus snow flakes).

Sorry that you did not understand what I was explaining. Hope this makes it clearer.

quote:

Originally posted by ALF:
I'm going to throw a spanner in the works.

Assuming we have two projectiles of same caliber made of the same copper jacket but one is heavier than the other and we subject the two to the same acceleration would there be a difference in the base expansion of the two and why? ( so what about inertia ? ) is the heavier of the two not "more intert" than the lighter and thus would be more prone to deformation upon accelleration ?

Alf,

Are you referrring to base expansion that occurs before the bullet enters the rifling, or after?

500grains,

Concerning the pressure spikes. The last,and I do mean the last box of Hawk bullets we bought had the ogive starting all over the place. We went to make some 505 feeding dummies and found this out when some of the bullets would stick in the throat. Rough measurements showed about a .030 variation. The bases on these bullets were not filled out correctly either.

I have a little experience with Hawk bullets.
I have shot deer, pigs, impala, and baboon with my 9,3x74R, with a 285 grain Hawk with the .035jkt.
I have shot pigs, and deer with 300 grain bullets with the .025 jkt, and one pig with a 400 gr. bullet with the .o35 jkt in my 450/400 3 1/4 inch Nitro double rifle.

In the above rifles Hawk bullets have given me 99.99% one shot drop to the shot kills. One pig ran about 20 yards or so when hit with the 9,3.
I have recovered some of the Hawks, all have mushroomed beautifully. The .025 jkt bullets "coin" out. The .035 jkt bullets have adequate shank left.
The velocities of the Hawks are @ 2350 fps for the 300 gr 408's and the 285 9,3's.
The 400 gr .408 was @ 2150 fps.
For the rifles/game I use the Hawks for they are the best bullets on the Planet.
When it comes to killing quick they are bad to the bone.

450, have you tried any of their .050 jkts on the .408 loads?
How about at lower velocities?
Frank