Load Work for 338Win Mag

[bullet]

250gr Nosler AccuBond

Started my load work with Nosler bullets today and only tried the 210gr Partition using three powders IMR4350, H4350, IMR7828. Best accuracy for the day was no better than 2 1/2" group and best velocity was 2936fps.

Will be adjusting OAL and also using some RL-19 that I have not used yet. If the RL-19 and adjusting OAL on the H4350 load does not improve accuracy of the 210gr I will be focusing on the other Nosler bullets I have.

I will be testing tomorrow the 200gr AccuBond, 250gr AccuBond and 250gr Partition.

 

[JD338]

Mike,

Nice picture as usual. I know you will find the load.

JD338

 

[bullet]

Here is my favorite picture of the 250gr AccuBond - I replaced the first picture on the initial post with this one. Also this is my desktop picture for my computer.

 

[JD338]

The 250 gr AB is an impressive looking bullet. That long sleek bullet shoots pretty good for me and I am sure you will have similar results. I probably should have sent you a few more!

Looking forward to your range report.

JD338

 

[bullet]

The 250 gr AB is an impressive looking bullet. That long sleek bullet shoots pretty good for me and I am sure you will have similar results. I probably should have sent you a few more!

Looking forward to your range report.

JD338

I am thankful for what I got and it will be enough because I have a feel for the cartridge now and what it kind of likes when it comes to burn rate. I really like the .575 coefficient of the 250gr bullet. If it shoots good because it will carry like a hot loaded 180gr bullet out of a 30-06 but with much more authority and outstanding penetration. If I can get it to 2700fps to 2800fps it will hold over 2000pounds of energy past 500yds. In other words it will have a lot of energy hitting anything I want to kill with it even out to 400yds.

 

[JD338]

I think RL 19 will give you the results you are looking for with the 210 gr PT.

JD338

 

[DrMike]

Beautiful photography, as usual. I really admire your work, Mike.

 

[bullet]

JD, I will be trying it as soon as my brass shows up. Mike, thanks, I love to take pictures.

 

[big rifle man]

Bullet, I don't know if you have any RL22 on hand but I've used that in my .338RUM and my buddy has used it with 225 partitions in his .338WIn with excellent results.

 

[bullet]

Well, the process continues with some good new today and some not so good news.

First the 200gr Accubonds shot good and I got good velocities. Using only IMR4350 and H4350 today with the 200gr AccuBond I had the following results.

200gr AccuBond, Remington Brass, 215 Fed primers, 75grs IMR4350, .879" group moving at 3019fps on average.

200gr AccuBond, Remington Brass, 215 Fed primers, 74grs H4350, 1 1/2" group moving at 2989fps on average.

250gr Accubonds were not accurate and velocity was only 2601fps and 250gr Partitions shot a little better and velocity was only 2606fps using for both bullets H4831sc.

I will have to wait for my new brass to get here to continue my work but I am going to use the 200gr AccuBond on deer instead of the 215gr Sierra and using RL-19 and RL-17 (if I can get some 17) might increase velocities. If it does and accuracy stays the same or improves the 200gr AccuBond is a player. Also, will continue to work with 210gr Partition using RL-19.

 

[Antelope_Sniper]

Mike, Looking very good. A 200gr bullet over 3000 is nothing to sneeze at.

Mike, you load is very similar to mine. The H4350 didn't like the Fed215's and I couldn't get it to go under an inch until I switched to WMRP's, but It looks like the IMR powder might be a little more tolerant of the hot primers.

Win Brass
76gr H4350
WMRP
200gr AB/BSST

H4831 Seems to provide good accuracy with the heavier bullets.

 

[bullet]

Mike, Looking very good. A 200gr bullet over 3000 is nothing to sneeze at.

Mike, you load is very similar to mine. The H4350 didn't like the Fed215's and I couldn't get it to go under an inch until I switched to WMRP's, but It looks like the IMR powder might be a little more tolerant of the hot primers.

Win Brass
76gr H4350
WMRP
200gr AB/BSST

H4831 Seems to provide good accuracy with the heavier bullets.

When my brass comes in I am going to try Rem 9 1/2 Mag primers and some CCI 250

 

[SJB358]

Mike, I am using RL19 and CCI250 in Federal cases with the 225gr Accubonds and getting about 2850 with 74grs. I am not sure how it would work with the 250's but it is at about inch with my Model 70. I have not tweaked on the BOSS yet either. I kind of wished I could have gotten some of the 250's for the 338, but the 225's are plenty for anything I would ever hunt in NA. Good luck with your load work. Your pictures look great. Scotty

 

[bullet]

Back in business, my 50 pieces of new brass came into today. Will be trying RL-19 with the 210gr Partition and RL-22 with the 250gr AccuBond and Partition. Also will be using Rem 9 1/2 Mag primers.

 

[bullet]

Just a slight change in my approach than was planned.

Tomorrow morning I will be testing H4350, IMR4350, RL-19 with the 200gr AccuBond and 210gr Partition using CCI250 primers. I believe I have corrected the COL for the 210gr Partition, should have better luck tomorrow with this bullet.

I will be testing RL-22 with the 250gr Accucbond using CCI250 primers. Also, have adjusted the COL of thie 250gr AccuBond giving it just a little more of a jump than before.

Yes, tomorrow should be fun and interesting.

 

[JD338]

Good luck Mike!
I think RL 19 and RL 22 will give you some good results.

JD338

 

[bullet]

Good luck Mike!
I think RL 19 and RL 22 will give you some good results.

JD338

I am expecting the same thing Jim. One thing for sure it will be fun tomorrow morning early. Temps will be in the low 50's and I will finish shooting before they get above 65 degrees. I am looking forward to tomorrow. :grin:

 

[Ridge_Runner]

I work up a load for a buddies 338 wm, finaly settled on 75 gr re-22 behind a 250 smk for 2775 fps, and it will shoot 1/2" when he does his part.
I know the smk isn't a proper hunting bullet but he's shooting 100-140# whitetails, when you let 3/8" of daykight through them does bullet construction matter?
RR

 

[bullet]

This morning was quit a revelation to say the least. I tried RL-19 and H4350 in a head to head battle in the lighter bullets 200gr AccuBond, 210gr Partition and 215gr Sierra SBT.

First - the CCI250 primers using the above powders and Rem New Brass gave more velocity and better accuracy than the 215 Fed primers in my Ruger Mk II 338Win Mag with a 24" barrel using the same powders, bullets and brass.

Second - the two best preforming bullets in my Ruger were in this order - the 200gr AccuBond with an COL of 3.407" giving a group size of .685" moving at 3047fps on average in front of H4350 using Remingtion New Brass and CCI250 primers. The 215gr Sierra SBT with an COL of 3.400" giving a group size of .789" moving at 2972fps on average in front of H4350 using Rem New Brass and CCI250 primers.

Third - with the 210gr Partition I did not get good accuracy and RL-19 with a compressed charge only gave me 2879fps where as H4350 gave me 2948fps with a compressed charge and neither powder gave an accurate group but the H4350 load was more accurate with the CCI250 primer than with the Fed 215 primer.

Fourth - the 250gr AccuBond with a max charge of RL-22 only gave 2678fps and accuracy was not better with this bullet than the last time I tried it with H4831. The 250gr Partition is more accurate and gave similar velocities.

I need to try and will after my hunt in Missouri on white tail, the 225gr AccuBond and Partition. The 200gr AccuBond will be the bullet I will be using in Missouri. At 3047fps what ever it hits it will rock and shake it for sure.

After three days in a row of shooting the 338Win Mag I think I will give my shoulder a rest :lol: :lol: :lol:

 

[Antelope_Sniper]

I'm very happy for you Mike. With a 200gr AB grouping under 5/8" you have good accuracy, good velocity, good mass, good trajectory, and great bullet construction. This is in a standard length action, with a 24" barrel. That makes for a well rounded package. 8)