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Old March 27, 2014, 04:03 PM   #1
Millet
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Need data for 243. using H4350

Hello guys, I'm new here and also new with reloading. Unfortunatly I don't have a reloading manual yet. I'm looking for data on .243 win, H4350 using Sierra 80 gr Blitz varminter bullet. Any help? Mainly need starting and max gr. Thanks
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Old March 27, 2014, 04:41 PM   #2
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Good, Better, Best advice: buy the manual.
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Old March 27, 2014, 04:46 PM   #3
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Next best advice: on-line data from Hodgdon

www.hodgdon.com
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Old March 27, 2014, 05:04 PM   #4
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If, you are serious about reloading, you do need a manual. There are many out there and any of them are better than none. You really aren't going to trust a bunch of nuts on the internet. Are you?
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Old March 27, 2014, 05:09 PM   #5
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If you are new to reloading see posts 2 and 4. You won't get better advice.
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Last edited by Greg Mercurio; March 27, 2014 at 05:31 PM.
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Old March 27, 2014, 06:50 PM   #6
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Ok, whats a good manual?
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Old March 27, 2014, 07:18 PM   #7
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I like Modern Reloading 2nd. edition by Richard Lee. It has lots of info and it is not brand specific like many of them. It is a compilation of many different manufacturers information. Another good one is Lyman Reloading 49th edition. I like this one for the same reason. Most of the others are brand specific. That isn't bad. I just think that you get more info from ones that aren't. There is a lot of information on the powder manufacturers websites, also and it is all up to date. Best wishes and good luck.
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Old March 28, 2014, 07:22 AM   #8
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My go-to manual is the two-book Hornady set, followed by Lyman, and then all of the information available on the web from the different manufacturers.
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Old March 28, 2014, 07:37 AM   #9
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Sierra Manual for the .243 online.

http://accurateshooter.net/Downloads/sierra243win.pdf
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Old March 28, 2014, 08:04 AM   #10
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With the 80-85 grain bullets you may have much better results with IMr 4064
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Old March 28, 2014, 05:49 PM   #11
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2 manuals I use extensively are Lees 2nd Edition and Hornadys manual. I also use Hodgdon.com
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Old March 29, 2014, 08:56 AM   #12
Millet
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How temp sensitive is imr4064?

Just today I started a ocw test with h4350. started showing pressure signs at 42.2 gr. With velocity around 2950. Wish I'd be faster tho. I might go back to h414 unless accuracy is exceptional.
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Old March 29, 2014, 02:58 PM   #13
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IMR powders tend to be incredibly flexible and very forgiving. They're not particularly sensitive to temperature variations, but they can be sensitive to loading density.

The most accurate loads I ever had out of my .243 was with 4064.
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Old March 29, 2014, 03:27 PM   #14
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Ok, well there's another powder for my "test" list to try out sometime. well thanks again!
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Old March 29, 2014, 09:30 PM   #15
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one of the best loads i ever found was a sierra 85 grain game king hollow point in front of 37 grains imr 4064 with cci 200 primers.

thats a pretty hot load though so i would start 10 percent or so lower and work up. in .5 grain increments
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Old April 2, 2014, 07:46 AM   #16
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millet

have you had a chance to test any more yet?
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Old April 2, 2014, 08:45 AM   #17
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I'll echo the suggestion to use IMR 4064. In the .30 calibers it is noted for exceptional temperature immunity and has been the basis for many match loads. I don't have personal experience with it in the .243, and cartridge geometry can affect temperature sensitivity, but this powder also has the property that it tends not to build pressure as rapidly with charge weight as some others. John Feamster had an example in .308, shooting 180 grain match bullets where the amount of 4064 it took to achieve 2200 fps was less than the amount of 4895 it took. At 2400 fps, the charge weights were equal. At 2500 fps and up, it took more 4064 than 4895. It's as if the relative burn rate was lower as pressure got higher, and that's perfectly possible. It also means less sensitivity to other pressure influences such as temperature and small errors in charge weight.

Varget is Hodgdon's nearest equivalent to IMR 4064, and would be another good choice.

You didn't mention your barrel length. Note that the Sierra data is for a Remington 700 with 22" barrel, Federal Cases and Federal 210M primers. Change any of that and velocity will be different. Ammo manufacturers use standard test barrels that are 24" long in .243, and wherever you don't see a barrel length stated, you can expect it is 24". If your barrel length differs from the lengths of the test guns, or if your chamber is bigger or your brass is heavier or lighter, you can get different results.

Below is a typical velocity correction approximation for different barrel lengths for medium power rifles, based on a 24" barrel producing 100% velocity. Magnum and overbore cartridges and small capacity cases have somewhat different numbers.

Code:
Barrel	Velocity
16"  	 91%
18"	 94%
20"	 96%
22"	 98%
24"	100%
26"	102%
28"	103%
30"	104%
32"	106%
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Old April 4, 2014, 01:18 PM   #18
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I get good accuracy using 42gr. of RL17 with 80gr. Nosler Ballistic Tip bullets.
2.035" case trim and loaded to 2.610" OAL. RL17 is starting to grow on me. I also have had success loading 180gr. 30.06 using it.
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Old April 4, 2014, 09:19 PM   #19
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Sorry for the slow reply. Yes, I started by working up to max but didn't finish my test because I wasn't happy with velocity. H4350. 2700 fps vs. H414 3250 fps. I went back to H414 and I'm pretty happy with it. I thought it was pretty consistent.....ES 55 fps over 14 shots and 3 different charge weights .4 gr difference. Maybe after my h414 runs out I might try varget or imr 4064. Sounds like those are pretty popular with the .243.
My barrel length is 22" ...my manual says 3404 fps but mine are a little slower....
Anyway thanks for the info and advice! I think I'll shoot h414 for awhile till I get itching to try something different
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Old April 5, 2014, 06:08 AM   #20
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I had pretty good luck with the lighter bullets and H-380 in a couple of .243's. I reserved the 4350's for weights starting at 95 and working up.

Not that there aren't a half dozen other powders that will work equally and possibly even better to use. Just tossing that out in case you can't find them.
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