11-13-2021, 03:52 PM
Oso Polaris Wrote:There is a difference between the H & I, most notably that IMR is temperature sensitive. But they are similar in burn rates. Here are a couple of threads comparing H4895 and IMR 4895, with both indicating that H4895 is faster than IMR4895, and usually a a few tenths more IMR powder will be needed to achieve the same velocity at the H4895 load. Based on this, you have a much larger delta in powder weights (as much as 1.6gr), which is the main contributor to the velocity difference.
https://forum.accurateshooter.com/thread...5.3844184/
https://forum.accurateshooter.com/thread...t-35844038
Make it a science experiment: The only way to really know is to load a small batch using both powders at same charge weight while holding everything else exactly the same (new brass, primers from same sleeve, bullets from same box) and go shoot them side by side.
+1. Go go for the experiment!
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"To those who have fought and almost died for it, freedom has a flavor the protected will never know."
-- Author Unknown
"If at first you do succeed, try not to look astonished!" -- Milton Berle