Imr 4350/h4350 ?

savagelover said:

I have h4350. Can I use it for imr 4350 loads,if I start at a lower charge and work up. Thi

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The start loads and max loads are generally within a grain of each other.
The text book answer is no.
I lower the start and max charge by the percentage difference I come up with from reviewing the powder charges across multiple cartridges and bullet weights. Obviously this is done at your own risk.
What cartridge and bullet weight?

Hodgdon has reloading data online for pretty much every SAMMI certified cartridge. Did you check www.hodgdonreloading.com?

I just looked at .30-06 and .300WM on hodgdonreloading.com because I know both powders are used in those chamberings. Here's what I noticed:

• Start/Max charges were very close in .30-06 for heavy bullets, but H4350 charge weights were a bit higher for light bullets
• Start/Max charges tended to be higher for IMR 4350 in .300WM
• There are multiple instance in .300WM where the max charge of H4350 is only a grain more than the starting charge of IMR 4350. This would make using H4350 risky and inadvisable in place of IMR 4350.

Bottom line, you really need to look at hodgdonreloading.com or published load data for your particular cartridge and bullet. People here would be happy to help if you give more information.

1. The book answer is no...
2. Reality is you can use any powder you want if you start at a known good start and work up. A phone call to the manufacturer is where I source that data. Are you going to try this because we say it's OK or you you have the background knowledge to do this safely. Rifle loads are not the place to start experimenting.

I have h4350. Can I use it for imr 4350 loads,if I start at a lower charge and work up.

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Yes.

Again, it really depends on the cartridge and bullet. Using H4350 in place of IMR 4350 would be a very bad idea in .25-06 for example. Hodgdonreloading.com show the max charge of h4350 is 0.5 grains LESS than the start charge of IMR 4350 for a 120 grain bullet. The max charge of h4350 is only 0.7 grains more than the start charge of IMR 4350 with a 117 grain bullet.

Maybe, as I have noticed with H4350 is fairly low density. You may not be able to fit enough H4350 in the case to make it go fast enough.
For example I can't fit enough H4350 in new 8x57js brass to hit my rifles accuracy node or even fit enough H4350 to get to the max book loads.

savagelover said:

Can I use it for imr 4350 loads,if I start at a lower charge and work up.

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wombat13 said:

Again, it really depends on the cartridge and bullet.

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No, and yes.

No to the first question: meaning you have reliable data for IMR4350 and a comparable bullet, but you cannot extrapolate H4350 data over... although I'll admit it's very likely close, much like H4895 and IMR4895, et al. But at the end of the day, they are 2 different powders.

Yes to the second response: It DOES depend on what, exactly, you are loading. See my first point (the part about having reliable data to base your load on.)

I have both 4350's but already know they are not the same, so what would be the point? For any load I have in one, I can find load data for the other.

Howa 9700 said:

I have both 4350's but already know they are not the same, so what would be the point? For any load I have in one, I can find load data for the other.

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This, exactly.

Depends on bullet weight (and I don't really know how cast bullet would change things). Max charge for IMR 4350 can be up to 2 grains higher than H4350 in .243 win according to Hodgdon. You should definitely back off and work back up.

savagelover said:

It's a 243 with cast bullets. I have other powders but I see loads for imr 4350. What I have is H 4350 powder. Appreciate all the information..No,I never go by the web sites and maybe you have no idea what your talking about. Lol I checked hodgdon and there is NO cast bullets listed..

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H4350 is to slow in almost every application for cast bullets. Unless your casting skill is way beyond mine you will likely want to remain at or below 2200 fps. Calculate what case fill you would get for that velocity and see that it's probably a bad idea. You should probably be looking in the h/I 4895 area.

savagelover said:

I'm using linotype for the bullets with gas checks.

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And what lube prevents catastrophic leading above 2500fps

savagelover said:

It's a 243 with cast bullets. I have other powders but I see loads for imr 4350. What I have is H 4350 powder. Appreciate all the information..No,I never go by the web sites and maybe you have no idea what your talking about. Lol I checked hodgdon and there is NO cast bullets listed..

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In that situation I wouldn't be too worried. That being said. I would be trying a different powder because I have poor results from slower powders.

The don't even use powders as slow as 4895. I have bunches of 4198 for cast so no doubt that's first choice.

savagelover said:

243 cast bullets

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savagelover said:

h4350

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What weight is the gas checked cast bullet?

Curious to see where this goes, and what weight little pill. My M1A is chambered in .243 and I just worked up loads with both 4350's (jacketed) but have yet to chrono them. Casting those little buggers is appealing - you could make a pile of them for minimal cost.

cheoah said:

Curious to see where this goes, and what weight little pill. My M1A is chambered in .243 and I just worked up loads with both 4350's (jacketed) but have yet to chrono them. Casting those little buggers is appealing - you could make a pile of them for minimal cost.

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A 154 38 bullet costs me about 6 cents to make using rmr lead. Powder coat is less than a cent. Gas checks are the biggest expense if needed. I avoid gas checks when possible.

savagelover said:

It's a 243 with cast bullets. I have other powders but I see loads for imr 4350. What I have is H 4350 powder. Appreciate all the information..No,I never go by the web sites and maybe you have no idea what your talking about. Lol I checked hodgdon and there is NO cast bullets listed..

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You most certainly can but must LOWER the charge ,as Hodgdon is slower and produces more pressure . As others have stated in MANY loads they're only a grain or two off at max load . Very common practice done more than people realize . Check out the link and toggle between the two .

https://www.hodgdonreloading.com/reloading-data-center?rdc=true&type=54

savagelover said:

87 gr

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I would be most concerned with getting a ton on lead in the barrel shooting those at typical 243 velocities even with gas checks.