.243 Win. Load 105amax - Expereinced Suggestions Needed??

[Rmitch223]

I just recently got into reloading about 6 months ago. During that time all I have loaded for is my .243 Win.

Over that time I have put together a fairly accurate load.
105amax
40gn of IMR-4350
Federal 210M
Seated at 2.800" OAL .020 off the lands.
Lapua Brass

I'm looking to get away from IMR-4350 because of its temperature sensitivity.

What powder(s) would be best for this load?
H4350?
H4831sc?
H1000? with a magnum primer?
Retumbo? with a magnum primer?

Another powder not listed?

Or stay with the IMR-4350 because my load wont have any pressure spikes come summertime(90 degree plus temps here in Oklahoma)? I understand that IMR-4350 is temperature sensitive, but since I worked up this load in the winter months would I have a pressure issue in higher temps or is it not that temp sensitive?

Here is my latest target with my current load, the two impacts in the upper right were sighters. I had just put on a Vortex Viper PST. The impacts in the center is a five shot group at 100 yards.

The Rifle - Rem. 700 SPS Varmint - 26" 9.125 twist barrel.

Any opinions would be appreciated.

Thanks,

Ryan

 

[AzDak42]

R19.. I had better results with R19 and the 105 Amax than I did any other. It also did amazingly well with the 95g S HPBT MKs.

 

[Guy Miner]

Essential reading for the accuracy-minded .243 loader/shooter. A great article over on 6mmBR.com:

http://www.6mmbr.com/243Win.html

I load the 6mm Remington, so can't give you hands-on info for the .243 Win.

Regards, Guy

 

[FOTIS]

Same load and work up using the slower H4350. Worked great in my 243.

 

[jmad_81]

H1000 worked really well in mine. with 210 primers. Work up to 47.5 gr and see what you get.

 

[Oldtrader3]

Nobody here probably has a Piezo crystal recording transducer set up in a pressure gun to check verity but word has it that IMR 4350 is actually less pressure sensitive than some of the "low temperature sensitivity" powders that are being marketed against it. One study that I read showed IMR 4350 against H-4350 in 50 degree F ambient temperature change test and the IMR powder changed pressure much less than the H-4350 it was measured against.

 

[frankm]

I'm loading 48.3 grains of Retumbo with CCI 250 and getting 2950 fps with 26 inch barrel. Shoots great and I found the load and worked up to it on the Practical Riflery site. Hodgon lists 49 as max.

Give it a try by working up and the 48.3 charge is an OCW.....

 

[SJB358]

I am loaded up with RL22 and the 105 AMAX right now, so I will let you know how my combo works the next time I get out to the range. I don't sweat the temp sensitivity deal. I think alot of it is marketing more than good solid facts.

 

[Woodycreek]

Retumbo, Fed 210M, and the 105 Amax work great for me.

 

[Rmitch223]

I found two pounds of H4350 yesterday locally, so I decided to give it a try first.

What charge weight do you guys 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.

Once again I'm loading for the 105amax in Lapua brass seated at 2.800" OAL with Federal 210M Primers.

 

[AzDak42]

I found two pounds of H4350 yesterday locally, so I decided to give it a try first.

What charge weight do you guys 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.

Once again I'm loading for the 105amax in Lapua brass seated at 2.800" OAL with Federal 210M Primers.

In my 700, I had crappy luck with H4350 in using the 105 Amax. It closed up the faster I pushed them, but I hit book max before groups tightened up far enough. (I think I loaded up to 41g following the hornady book if memory serves.) The factory rifling on a 700 is just at the edge of stabilizing the 105s, so pushing them faster may be the secret to getting enough stabilization. R19 gave me another 150fps at the high end, which got me the best groups. YMMV.