My opinion: Temperature Insensitivity is all the rage, making H4350 a little more popular than the other 4350’s. I do not concern myself with this aspect of the powders in most cases, as I, myself, am Temperature Sensitive. The powder will only get used between 40 and 95 degrees with me and not much variation occurs over that temperature range, if you stick to the published load data. My target shooting guns are not used when it is uncomfortable outside, and my hunting guns are always “accurate enough” here in Georgia.
I use AA4350 in my 243, only because I bought 10 pounds several years ago. It is a larger stick powder, and must be hand weighed and then shaken down into the case to get the entire load to fit in the case of some calibers.
AA4350, H4350, IMR4350, and SW4350 will all give similar results. The powder charge for a given velocity will vary slightly. AA4451 is an excellent powder to try if you are using 4350. You might also look at AA2700.
I use AA4350 in my 243, only because I bought 10 pounds several years ago. It is a larger stick powder, and must be hand weighed and then shaken down into the case to get the entire load to fit in the case of some calibers.
AA4350, H4350, IMR4350, and SW4350 will all give similar results. The powder charge for a given velocity will vary slightly. AA4451 is an excellent powder to try if you are using 4350. You might also look at AA2700.