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Old February 7, 2012, 08:06 PM   #6
Slamfire
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Join Date: May 27, 2007
Posts: 5,261
When I conducted some research in my American Rifleman collection, I thought I found when H4895 was introduced, and the ad said it was identical to IMR 4895.

That was a long time ago. Recently I talked to Hodgdon and H4895 is one of their extreme powders and is made in Australia.

However, the load data is close.

Something that is ignored is lot to lot variation of powders. The powders we buy are blended to, according to Accurate Arms, a 10% variation. That explains why reloading manuals always had different charge weights/max pressures for H110/W296 and HP38/W231. These were and are the same powders, but they were testing different lots.

My own testing of H4895 shows it gives me close, but not exact velocities as IMR 4895, for the same charges in 308.

Like any powder, develop your loads. Things are always weird for maximum loads.



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