reynolds357
New member
Whose 4350 you like best? I used to prefer IMR. Used Hodgdon a little. As of last few years, getting less deviation with Accurate.
4350
- Thread starter reynolds357
- Start date
H4350 is temperature insensitive - 8 fps variation from 0 to 125 deg F. - that is a change of 0.064 fps per deg f. so there is effectively no change in velocity from summer to winter in most locations.
IMR4350 is temperature sensitive - 155 fps variation from 0 to 125 deg F. - that is a change of 1.24 fps per degree F. which can be significant.
If you reload cognizant of temperature, then they both perform as expected.
If you have loaded using loads from a manual that has rounds tested at 70 degrees and sit in a blind in 30-degree weather, you won't be getting the expected velocity with IMR 4350. The mv will be 50 fps slower than you thought.
IMR4350 is temperature sensitive - 155 fps variation from 0 to 125 deg F. - that is a change of 1.24 fps per degree F. which can be significant.
If you reload cognizant of temperature, then they both perform as expected.
If you have loaded using loads from a manual that has rounds tested at 70 degrees and sit in a blind in 30-degree weather, you won't be getting the expected velocity with IMR 4350. The mv will be 50 fps slower than you thought.
That was one of the reasons I am starting with the H4350. I read an article on temp sensitive powders.
FrankenMauser
New member
Accurate 4350 was my favorite until I had three pounds of it go bad - along with all of the ammo loaded with it.
Haven't used it since, because I haven't been able to get any.
Haven't used it since, because I haven't been able to get any.
Just out of curiosity, about when was that?
Any chance it was your fault? (storage conditions?)
Did you contact the maker?
If so, what was their response?
If stored under proper conditions (as I'm confident you did) powder that goes bad, is a bad lot# and the maker needs to know it happened. Even if they don't do anything to compensate for your loss, they need to know it happened, so they can figure out what went wrong, and why.
I've only used the IMR 4350 and it was some time back, but as I recall, it kicks butt in the .25-06 with 87gr HP varmint bullets.
reynolds357
New member
How long did it take to go bad?
I had some Accurate 3100 go bad. Took me 30 years to notice it had failed, so it was probably bad somewhere between 20 and 30 years in. Properly stored in a basement in the original container the whole time.
Norma says they only warrant powder for 10 years, but most, of course, last a lot longer. There's a random crapshoot element to how long a canister grade powder will last due to the unknown (to the consumer) age of the lots mixed with it to control the burn rate.
Norma says they only warrant powder for 10 years, but most, of course, last a lot longer. There's a random crapshoot element to how long a canister grade powder will last due to the unknown (to the consumer) age of the lots mixed with it to control the burn rate.
FrankenMauser
New member
Re: Accurate 4350 going bad:
When? November 2019.
Western Powders issued a recall for certain powders that had been manufactured by General Dynamics prior to 2016.
Accurate Powder recall
I checked what I had left. All was in the recall and all was bad. As was the ammo.
Two canisters had not been opened and were turning brown with an acrid odor.
The open, but nearly full canister, was actively off-gassing brownish-orange vapor.
Original containers.
Storage conditions were stable and as good as can be expected without dedicated climate control. -- No sunlight, ~62-68 F year-round, with very slow (seasonal time frame) changes from high to low. Though not as important with sealed powder containers as with primers, humidity is typically 20% in the winter and peaking at about 38% in the summer; without varying more than a few points except for the seasonal swings. (With 'winter' representing about 5 months of dry, not the "three" months on the calendar.)
Since they had issued the recall, they were obviously aware of the issue. I called and followed their instructions. I got a check for the then-current MSRP of the product.
Cornbush (member here) came out far better. He contacted them about a single pound of 4350 that seemed to have not turned yet, and casually mentioned wanting to get into PRC shooting while the guy on the other end of the phone was having computer troubles. They sent him several (free) 8-lb jugs of powder appropriate for the cartridges he was considering using, as well as a check for the recalled 4350.
When? November 2019.
Western Powders issued a recall for certain powders that had been manufactured by General Dynamics prior to 2016.
Accurate Powder recall
I checked what I had left. All was in the recall and all was bad. As was the ammo.
Two canisters had not been opened and were turning brown with an acrid odor.
The open, but nearly full canister, was actively off-gassing brownish-orange vapor.
Original containers.
Storage conditions were stable and as good as can be expected without dedicated climate control. -- No sunlight, ~62-68 F year-round, with very slow (seasonal time frame) changes from high to low. Though not as important with sealed powder containers as with primers, humidity is typically 20% in the winter and peaking at about 38% in the summer; without varying more than a few points except for the seasonal swings. (With 'winter' representing about 5 months of dry, not the "three" months on the calendar.)
Since they had issued the recall, they were obviously aware of the issue. I called and followed their instructions. I got a check for the then-current MSRP of the product.
Cornbush (member here) came out far better. He contacted them about a single pound of 4350 that seemed to have not turned yet, and casually mentioned wanting to get into PRC shooting while the guy on the other end of the phone was having computer troubles. They sent him several (free) 8-lb jugs of powder appropriate for the cartridges he was considering using, as well as a check for the recalled 4350.
reynolds357
New member
I will have to look at mine. I have some from that era.Re: Accurate 4350 going bad:
When? November 2019.
Western Powders issued a recall for certain powders that had been manufactured by General Dynamics prior to 2016.
Accurate Powder recall
I checked what I had left. All was in the recall and all was bad. As was the ammo.
Two canisters had not been opened and were turning brown with an acrid odor.
The open, but nearly full canister, was actively off-gassing brownish-orange vapor.
Original containers.
Storage conditions were stable and as good as can be expected without dedicated climate control. -- No sunlight, ~62-68 F year-round, with very slow (seasonal time frame) changes from high to low. Though not as important with sealed powder containers as with primers, humidity is typically 20% in the winter and peaking at about 38% in the summer; without varying more than a few points except for the seasonal swings. (With 'winter' representing about 5 months of dry, not the "three" months on the calendar.)
Since they had issued the recall, they were obviously aware of the issue. I called and followed their instructions. I got a check for the then-current MSRP of the product.
Cornbush (member here) came out far better. He contacted them about a single pound of 4350 that seemed to have not turned yet, and casually mentioned wanting to get into PRC shooting while the guy on the other end of the phone was having computer troubles. They sent him several (free) 8-lb jugs of powder appropriate for the cartridges he was considering using, as well as a check for the recalled 4350.