I went and posted the results of the test for this under the "A must read for all big bore readers" post. 470 Mbogo

470 Mbogo,
I am astounded at the consistency! I would not have thought it possible. I have seen 2" differences using the same loadings at the same distances on a number of occasions.
It appears the plywood / airspace / plywood arrangement is a good one. Thanks for your efforts in this.

Nick

470 Mbogo,
Thanks for all the effort and sharing the info. Does this mean that a go-to-sleep period has little to do penetration? I will be looking up your website for your interpretation.

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Good huntin' and shootin',
Bwanawannabe, Daktari Ron

[QUOTE]Originally posted by R. A. Berry:

R.A.Berry,
I think you must agree (maybe) from the results that you could have this much variation in depth of penetration from bullets of the exact velocity at impact just from the inconsistencies in the plywood alone. I tried shooting three shots from 100 yards with a starting velocity of 2500 fps which would have an impact velocity of aprox. 2270 fps and all three bullets were in the same piece of plywood at the 29 inch mark. There was .647 difference in the amount of penetration between the three shots. Considering that the five shots, one at point blank, one at 25 yards and three at 50 yards had a penetration difference of under.9 of an inch and a velocity difference of 28 fps for five shots at the point of impactI would say that bullet stabalization makes no difference in plywood penetration.Therefore if you ever get charged by a plywood Lion you can feel compforable in waiting until the charge is off the muzzle before firing. The effort was a pleasure,I found it very interesting myself.
Good hunting to you also. 470 Mbogo