Question: is imr 4350 the same as h4350?
Answer: ArchAngelCD Member. IMR4350 and H4350 are extremely similar but not the same just like both 4895 powders. The two 4350 powders are made in different plants and one is slower than the other. Burn rate charts will tell you one powder is faster or slower than another but not HOW MUCH faster or slower.