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IMR-4350 temp sensitive???

 
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  #1  
Old 01-06-2007, 08:35 AM
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IMR-4350 temp sensitive???

When I first was doing load development for the 100g btip and IMR=4350, the temp was probly 65-75 degrees, cant remember right off the top my head. Velocity was 3350fps. Yesterday I loaded the same load, temp was around 45 degrees,but this time velocity was 3150fps. This is a new can of IMR-4350, so maybe that might have somethign to do with it?? Also, on these particular cases, they ahppened to be my trial and error on flash hole deburring. I ran the deburing tool all the way through the flashhole on all the cases. I didn't know untill later that your not supposed to take that much off [img]/ubbthreads/images/graemlins/blush.gif[/img] Just kinda curious as to why my velocity dropped off 200fps, accuracy wasn't exactly what I was expecting either...I ran a series of 5 shot groups with 50.8g, 51g, and 51.2g. Averages were 1.25" at 100 yards.
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Old 01-06-2007, 09:18 PM
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Re: IMR-4350 temp sensitive???

Hi change to a Hodgdon powder i would use H4831SC or H1000 but if you like the faster powders H4350 is just a little slower than IMR4350 so back the loads down a little and then re work them up. The IMR powder does not have the same technoligy as the Hodgdon Extreem. Hodgdon does now own IMR but they do not own the tecnoligy for the temp sensitive extreem powder it is made here in Australia by ADI and then sold to Hodgdon and repackaged into their containers and the names changed from the australian ones.
Here
Varget is called AR2208
H4350 is called AR2209
H4831SC is called AR2213SC
H1000 is called AR2217
Retumbo is called AR2225
and their are the others

Cheers Bill
Australia
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Old 01-07-2007, 04:57 PM
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Re: IMR-4350 temp sensitive???

To clarify, was this 3150 fps load on the same exact brass (1/8" flash hole [img]/ubbthreads/images/graemlins/laugh.gif[/img]) as the 3350 fps load?
I would guess if they were different cases, the rather enlarged flash hole contributed to considerably differing velocities. I use IMR 4350 in a .30-06 I load for and am very fond of it with 175 SMKs, I have not noticed a significant change in dope from summer to winter, even with varying lots. I have only shot that rifle to 600... but I would expect 200 fps difference to have a very noticeable change in trajectory.
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Old 01-07-2007, 06:53 PM
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Re: IMR-4350 temp sensitive???

Different brass was used. The first time out, they were nice and tight pockets. The 2nd time out was the ones where I reamed all the way through them...It was also a new lot of powder.Guess I probly should trhow those cases away.
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Old 01-07-2007, 09:59 PM
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Re: IMR-4350 temp sensitive???

25, Just wait till the temps get in the 20's and see what happens. The IMR-4350 will light off like a flintlock and the H-4831 will go poof and the bullet runs out there about 100 yards or so and hits the grond.

The IMR-4350 was my experience in the 270. And the H-4831 was Mike/Tx lesson in the 30-06.

Tim
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Old 01-07-2007, 11:16 PM
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Re: IMR-4350 temp sensitive???

I use IMR4350 in 3 different guns 22-250,.270,.270 mag. I've shot prairie dogs in the august and in October using the same load and never had an issue. With both of my .270's I shoot all summer long and the day before the deer season starts in November I shoot one last time and they are both on. Although I did buy five one pound cans and they all had the same lot number.
I would load up some more with new brass and use only one lot number and have at it.

Good luck.
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Old 01-08-2007, 07:34 AM
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Re: IMR-4350 temp sensitive???

With the 100gr bullets in my 25-06, I tried several powders when developing the final load. I personally found that IMR-4831 gave the most consistant, and best groups from my rifle. It varied hardly any from top summer temps to colder winter temps. However, when I switched to the Sierra bullets, the same was not the case. I went through about a full box trying to hit something that would shoot using the same loads I had with the BT. I finially gave up and called Sierra and they told me to try IMR-4350 and it gave me one hole groups instantly at 3350.

As for the load TIm was referring to, and my 30-06 experience, this was actually using a compressed load of RL-22. The particular load would group under 1" out at 200yds and was grouping just under 3" at 450. I had worked it up using the 165gr BT for a particular deer we were hunting which came out at the furtherest corner of our property. I deveolped the load, and shot it to that spot several times through the summer and fall. Then when deer season was on it's finial day, I had a chance at another buck and chose the 30-06 to try out the load. What resulted was basically a squib load, due to the cold temps and compressed charge. The round sounded and felt like a reduced load of wet paper.

I would toss the cases, and go back to new cases and you should be fine. On future cases when you clear the flash hole you just want to clean enough that the cutter gets a smooth feel to it after you clear the burr. ANymore than that you wasting cases.
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