Bought a set of Dies for the .270 Win yesterday along with some 160 and 150 partitions. Opened the Nosler guide and they recommend the usual IMR 4350, IMR 4831, RL22 and RL 19 for the 160's bullet. But as for the 150 Partition the IMR 4350 and IMR 4831 is not even listed and is replaced by H4350 and H4831. My question is, what is the difference between the two? And If I substitute IMR for the Hogden will it be dangerous? What is so different that for the 160's IMR is good but when you step down to the 150's hogden is good.............had me puzzled on this one
I have been told that they don't list powders that have a SD of velocity beyond a certain range. So I guess with the 150 grain bullets, H-4350 is more consistent than IMR 4350 - at least in the rifle they used for testing in the Nosler book. My experience is that these two powder are really close and, if anything, H-4350 is a little slower.
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A man has got to know his limitations . . . . .
Hodgons and IMR are two different and seperate powders. Do not think they are the same. They are made by two different companies and don<t use loading data interchable,they do not!!! Just because the numbers are the same there are not. In some loading manuals they just use one type of pjowders made by one certain companies. Look up a hodgons manuals they have a lot of other companies loads in it also. vangunsmith
I find the H4350 is closer to IMR-4831, but the real standard in the .270 is H4831. RL-22 will give you a little bit more velocity, but not enough to go in search of it.
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Jest an ol' man livin' in the mountains.
While IMR 4350 and H 4350 are not interchangable, they are very close in burn rate. If you do not have data for one in your books, but have that powder, you can come up with good enough data to build a load.
So, interchangeable, the same? - NO.
Close to the same burn rate and characteristics? - Close.
Listen Mossy, I think a few people is taking this too far. I mean big bold letters like YES. Come on. The two powders are almost always within 1 grain of max load from each other in standard rounds like your 270. Take the speer manual, and barnes. With some bullets, they are exact, and some are within a grain. As the case opens up a tad when the case gets larger or you get to compressed loads. If you work up your load from which ever powder you got, you will see the pressure signs. And I know you know how to look for them.
I think people gets too caught in the manuals. Its a guide and results that a company got with a certain barrel. Not your barrel. Like my Krieger barrel in my 300RUM, will show pressure signs with max loads in some manuals but not with my factory barrel. You will even see deviations between editions of manuals. On edition will show one load being safe, and another different.
No they are not perfectly interchangable but they are close enough you can build up a load from starting load and note pressure signs. Especially a 270win.
H 4350 and IMR 4350
