H4350 load work up - 243 Win

[Rmitch223]

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

 

[Big Z]

Re: H4350 load work up - 243 Win

If it makes you feel more comfortable you could load a couple few more lighter rounds in 1gr increments.

 

[i_rep]

Re: H4350 load work up - 243 Win

Would not waste time with anything under 40.....i bet your load is between 42 and 43... I run 115s and run 42.5....my partner runs 105s and is just under that.

 

[Rmitch223]

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.

 

[Rmitch223]

Re: H4350 load work up - 243 Win

Here is the Quickload data Ive been looking at.

37gn seems fairly conservative.

Second page is the Quickload data at 41gn that I plan on working up to, still seems pretty safe in regards to pressure...?

 

[Rmitch223]

Re: H4350 load work up - 243 Win

BTT

 

[2Shots]

Re: H4350 load work up - 243 Win

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: i_rep</div><div class="ubbcode-body">Would not waste time with anything under 40.....i bet your load is between 42 and 43... I run 115s and run 42.5....my partner runs 105s and is just under that. </div></div>

I agree, I shoot 115's with 42.2 with no pressure, so I wouldn't waste time loading under 41. I would bet you will end up in that 42 to 44 range.

 

[Rmitch223]

Results!

5 shot groups at 100yrds.

Hard to choose which charge weight is best, what do you guys think?

38gn and 39.5 seem to be really close.

 

[Engine 22]

Have you tried 42grains +/- yet?

 

[Rmitch223]

Have you tried 42grains +/- yet?

No, highest I went so far is to 41.5gns.

 

[Rmitch223]

I don't know that I need to work up anymore.

Hard for me to imagine the accuracy could get any better, I may go up a few steps tho and see.