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H4350 load work up - 243 Win.

 
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  #1  
Old 02-12-2013, 03:18 PM
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Join Date: Mar 2009
Location: Oklahoma City
Posts: 29
H4350 load work up - 243 Win.

I've developed a fairly accurate load with my rifle using IMR-4350 and the 105 Amax in my .243 Win.

I'm switching to H4350 because of less temperature sensitivity.


I found two pounds of H4350 yesterday locally. So im starting a new load work up.

What charge weight do you recommend I start my workup at?

My Hornady manual shows a starting charge weight of 38.3gn and a max of 41gn.

Hodgdon's data online shows a starting charge weight of 35gn and a max of 37.5 so I'm a little confused as to why they are so much different.

I'm loading for the 105amax in Lapua brass seated at 2.800" OAL with CCIBR2 Primers.

Currently I'm preparing to load these five charge weights.
39gn
39.5gn
40gn
40.5gn
41gn

Quickload shows my max pressure if 54,000 at 41gn so I'm fairly comfortable knowing I'm not pushing the limits too much, but the data from the Hogdgon website with a max charge weight of 37.5gn has me second guessing myself. I assume it's because of a different seating depth that was used from the Hodgdon data.

Am I ok to go ahead with the 5 charge weights I listed above?


Thanks,

Ryan
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  #2  
Old 02-12-2013, 05:47 PM
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Join Date: Dec 2010
Location: Central Florida
Posts: 122
Re: H4350 load work up - 243 Win.

Be careful with the longer lenghts and max charge. What Quickload doesn't do is tell you how much "jump" you have. You might be very close to the lands with a COAL of 2.800". Measure the headspace on your brass after loading, take calipers to range and measure headspace after firing each batch. Look at primers, measure headspace, notice bolt lift and felt recoil and make good notes for furture loads. Sometimes the accuracy node is below max. Remember accuracy before speed, the target can't tell if one bullet arrives .003 of a second before the other.

I'll be interested in your results to load my grandsons .243 win.
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  #3  
Old 02-13-2013, 11:19 AM
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Re: H4350 load work up - 243 Win.

with my seating depth of 2.800" Im .018 off the lands.

Im confused because the starting charge weights vary so much between hodgdon and Hornady.

Im trying to find a starting charge weight that will be safe but also be close to the accuracy node so that I dont have to waste time, powder and bullets on low charge weights that arent needed for testing.

I may just go with hornady's starting charge weight of 38.3
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  #4  
Old 02-13-2013, 11:33 AM
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Re: H4350 load work up - 243 Win.

Quote:
Originally Posted by Rmitch223 View Post
with my seating depth of 2.800" Im .018 off the lands.

Im confused because the starting charge weights vary so much between hodgdon and Hornady.

Im trying to find a starting charge weight that will be safe but also be close to the accuracy node so that I dont have to waste time, powder and bullets on low charge weights that arent needed for testing.

I may just go with hornady's starting charge weight of 38.3
When manuals vary as they do in your case I usually shy away from the combo. It sounds like you can't, so start extra low, no more that mid load(preferably start) in the LOWER book and work it up 'till you hit pressure. The load data is rather worthless here, so you'll be essentially making your own. There was a reason hodgdon was so light on charge, but you won't know 'till you dive in.
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  #5  
Old 02-13-2013, 12:35 PM
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Re: H4350 load work up - 243 Win.

My experience with 105 AMAX and H4350 has been exceptional. I am running .15 off the lands. Quite a bit more jump than you are at .018. That is neither here nor there, just a difference to be mentioned.

I know you have done load development before, but I will hopefully help you out a little. That is a big maybe.

Looking at your developmental loads, I would decrease the charge distance to .2 from your current .5 grains. Why? I found a great difference in load development (ES and accuracy) with even this small charge distance. Also, it will give you a little more safety in working up to a max load that still hits your accuracy node.

I went with my middle node, which I found at 39.2gr. I went with the middle node just to give me a little better barrel life and still have decent velocity (2965 avg). I intially used a chrono and 100 yard distance to find accuracy and velocity nodes. I then checked for accuracy at just over 400 yards (407 exactly).

I found two loads that were very very close to one another in performance(39.8 was the other load). I went with the slightly slower load for the reason described earlier.

As far as H4350 goes, I have no complaints whatsoever. My load was developed when it was 65 degrees out and has held very true to 10 degrees. I have not done much shooting with this load at hotter temps during the summer. But, my load was made for hunting during the fall/winter. I'll know more once the summer months get here.

It is always a trial and error process with more errors than not. I hope you find the non-errors.
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  #6  
Old 02-13-2013, 01:19 PM
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Join Date: Mar 2009
Location: Oklahoma City
Posts: 29
Re: H4350 load work up - 243 Win.

I was thinking about loading some lower charges at 37gn, 37.5, 38, 38.5, then 39, 39.5, 40, 40.5, 41.

Just to be safe, most of the people I have talked to say there load is around 41 - 42 grains, but when I saw that hodgdon's max I gotta a little nervous starting my workup at 39gn.

But then again, If I'm good to go with no pressure issues at a 39gn starting charge I would'nt be wasting time, powder and bullets at those lower charge levels that Hodgdon recommends
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  #7  
Old 02-14-2013, 03:05 AM
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Join Date: Aug 2012
Posts: 11
Re: H4350 load work up - 243 Win.

I would load 1 shot each of the lower charges just to check the for pressure signs.

My Berger books states that as you increase seating depth you are in effect increasing case capacity and can increase velocity.
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