Starting on my first load for the new Weatherby Vanguard S2 in .30 06. Intended purpose is strictly target at this point. First load will be with the Hornady 168gn HPBT Match bullet. I have read good things about both IMR 4350 and H4350. I was leaning toward H4350, but when I went back to the LGS it was all gone. Another place in town has IMR 4350. Any reason I should hold out for the H4350? Anybody have experience with both with mid-weight bullets? I read that H4350 is less temperature sensitive. Is that really much of an issue given I don't plan on target shooting when it's too cold out or blazing hot for that matter. Thanks for any advice as always.
.30 06 H4350 or IMR4350
- Thread starter Gadawg88
- Start date
- Status
ColtPythonElite
Member
- Joined
- Jan 8, 2011
- Messages
- 10,477
IMR 4350 is about all I use in .30-06
Sunray
Member
Those two are very close to the same thing, but not the same. Numbers 113(IMR) and 114 on the burn rate chart.
The IMR starts at 54 goes up to 58(compressed) with less than 100 FPS(6 fps faster with max loads) in speed but more pressure(8 to 10 thousand PSI more). The H starts at 55.0(2,695fps 40,400 CUP) and goes to 59.0(2,897fps 48,100 CUP) There is no math formula for converting CUP to PSI.
I'd work up an H load and an IMR load.
Temperature sensitivity isn't likely to be an issue in Georgia.
The IMR starts at 54 goes up to 58(compressed) with less than 100 FPS(6 fps faster with max loads) in speed but more pressure(8 to 10 thousand PSI more). The H starts at 55.0(2,695fps 40,400 CUP) and goes to 59.0(2,897fps 48,100 CUP) There is no math formula for converting CUP to PSI.
I'd work up an H load and an IMR load.
Temperature sensitivity isn't likely to be an issue in Georgia.
I have used both. With the best loads accuracy is equal. I get about 20-25 fps more speed with IMR-4350. Unless I can't find it I prefer H4350 simply because it is less sensitive to extreme temperatures.
While it may never be a factor, it might be. Most powders will see 1-2 fps change for each 1 degree temperature changes. H4350 is typically less than .5 fps for each degree of temperature change. If I were getting considerably more speed or accuracy I'd use the IMR version. But with equal accuracy and such a small speed difference I prefer the H4350
I disagree, it works both ways. A load developed at 40 degrees here in Ga during the winter could be 100-150 fps faster and over pressure when fired in August when it is 100-110 degrees. It isn't just cold weather that affects ammo.
While it may never be a factor, it might be. Most powders will see 1-2 fps change for each 1 degree temperature changes. H4350 is typically less than .5 fps for each degree of temperature change. If I were getting considerably more speed or accuracy I'd use the IMR version. But with equal accuracy and such a small speed difference I prefer the H4350
I disagree, it works both ways. A load developed at 40 degrees here in Ga during the winter could be 100-150 fps faster and over pressure when fired in August when it is 100-110 degrees. It isn't just cold weather that affects ammo.
VThillman
Member
I keep thinking I read that H4350 is being discontinued... but then I remember it's H4227 that's going down.
Ron Go
Member
57 grains of IMR 4350 is an accurate load with CCI primers and remington brass in mine and other rifles.
That powder is so close to compressed I don't think temperature really matters. I use it in northern Ontario in Canada at temperatures near minus 40 and it has never failed to go bang.
If you are colder than that then bless you my friend.
That powder is so close to compressed I don't think temperature really matters. I use it in northern Ontario in Canada at temperatures near minus 40 and it has never failed to go bang.
If you are colder than that then bless you my friend.
ArchAngelCD
Member.
IMO there is little difference between IMR4350 and H4350 although I use more of the Hodgdon version than IMR.
A charge of between 57.0gr and 58.0gr H4350 under a 168gr Match bullet is very hard to beat... I usually stick with 57.0gr IMR4350.
A charge of between 57.0gr and 58.0gr H4350 under a 168gr Match bullet is very hard to beat... I usually stick with 57.0gr IMR4350.
TimSr
Member
I doubt you'll be able to tell the difference between the two. Also, if your load is not safe in your location year round, its probably too close to the margin.
When H4350 came out in the 80's, it was advertized as a duplicate of IMR 4350. I have tested the various 4350's: AA, H, and IMR. My lots all shot a little different, but considering these are all blended powders, I am of the opinion that what I am seeing as differences are only the variences between lots. If I were to buy three new pounders of these powders, the next time the ranking of fastest to slowest would all be shuffled.
gamestalker
member
I grew up on IMR-4350 on .270 win and 30-06. The groups I've shot with it have yet to be better with any other powder. Of course, that hasn't stopped me from branching out to other powders, but when the chips are down, I know I can always rely on IMR-4350 to come through for me.
I have experienced some temperature sensitivity effects with it, but never anything extreme. And considering my work ups are almost always near the upper end of the tables, I think unless the load is on the ragged edge, you'll be fine.
GS
I have experienced some temperature sensitivity effects with it, but never anything extreme. And considering my work ups are almost always near the upper end of the tables, I think unless the load is on the ragged edge, you'll be fine.
GS
ArchAngelCD
Member.
As for temp sensitive, you would have to be shooting in -20 for the powder to show sensitivity to the temperature. They are not talking about normal seasonal temp swings.
redbullitt
Member
h4350 has done fine in the 3006 I have loaded. It is marketed as temp insensitive, so maybe that is good lol.
Id buy whichever is cheaper and easier to get!
Id buy whichever is cheaper and easier to get!
- Status
