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Member frhunter13 is in the process of loading and testing GS Custom 450gr Flat Point bullets for use on Cape buffalo and will soon report on the results here. The object is to achieve 2,350 ft/sec for proper penetration through the shoulder to the heart.
To keep it all together this has been transferred from his post in another thread:
frhunter13 wrote:
I have 2248 now with my Barnes 450 TSXFB COAL 3.30 in the magazine so I think 73g TAC is fine. TAC or H335 can get the 450 Barnes Solid to 2379 fps 3.29 COAL (their factory ammo COAL). There have been too many successes with these bullets to discount them. TAC can get the 500 TSXFB to 2194 fps 3.31 COAL. 3.30 COAL also probably with a tad less powder. There are many more options with US powder per this web site: http://www.barnesbullets.com/files/2014/11/458WinchesterMagnum.pdf
Oops it the the 500 Banded that gets to 2194fps. The 500 TSXFB can only reach 2040 fps.