I got the best velocity and accuracy from H-1000. The next best was 7828 followed by R-22. I've shot numerous 1/4" 3 shot groups with 250gr Sierra's and H-1000. Velocity is around 2900fps in a 27" barrel. My rifle will shoot all of the above powders well under 1/2" though.
338 Jarrett reload information.
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salmonchaser
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Wow, once again thanks for the help.
One of the reasons I've been using R 19 is case capacity, especially when playing with longer Barnes bullets. My thinking was less powder equalls less compaction. I'm likely worrying about something I don't need too as long as I stay within limits.
My book indicates R 22 resulted in poor groups, but I didn't add any other information. I was surprised by that because R 22 gives me 1.076 for 5 shots at 300 with my 06; and 2.0 at 300 with my 7mm.
I looked through a couple of loading manuals and 7828 appears to have good utility for several cartridges I load for. I'm off to go shopping with my bride today, so I'll pick some up.
To improve my record keeping;, I've historically used notes such as, one hole, or three touching lateral. The notes above were from targets I saved and measured this morning center to center with calipers. Is center to center the best method?
One of the reasons I've been using R 19 is case capacity, especially when playing with longer Barnes bullets. My thinking was less powder equalls less compaction. I'm likely worrying about something I don't need too as long as I stay within limits.
My book indicates R 22 resulted in poor groups, but I didn't add any other information. I was surprised by that because R 22 gives me 1.076 for 5 shots at 300 with my 06; and 2.0 at 300 with my 7mm.
I looked through a couple of loading manuals and 7828 appears to have good utility for several cartridges I load for. I'm off to go shopping with my bride today, so I'll pick some up.
To improve my record keeping;, I've historically used notes such as, one hole, or three touching lateral. The notes above were from targets I saved and measured this morning center to center with calipers. Is center to center the best method?
longrangehunter
Handloader
- Jun 19, 2011
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salmonchaser":aghb6rh0 said:
Honestly it's like splitting hairs in a way, I suppose. The most accurate method is to measure outside to outside from the black ring from the furthest spread and deduct the diameter of the bullet. I think for the most part shoot a group and your eye will clearly tell you which load is working the best, unless they are all rather close in size?
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salmonchaser
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I don't seem to be able to get more accurate than 98.7 on the low end to 100 on the high end for h20 capacity. Interesting it was either or with nothing in between. Regardless it is clear I'm my mind that I don't want to be exceeding 340 weatherby data since I don't have greater case capacity.
I had loaded some partitions up to 84 grains rl 19. That was the only load I had actually fired over a chronograph and yields 2950 fps. A close examination of the cases shows what I believe may be faint extractor marks. I'm going to pull the bullets on the rest of those and stick with safe loads. I'll also try 7828 to see what that will get me.
I would rather be a little slower and safe.
I had loaded some partitions up to 84 grains rl 19. That was the only load I had actually fired over a chronograph and yields 2950 fps. A close examination of the cases shows what I believe may be faint extractor marks. I'm going to pull the bullets on the rest of those and stick with safe loads. I'll also try 7828 to see what that will get me.
I would rather be a little slower and safe.
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salmonchaser
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salmonchaser
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It has done that. Accurate and powerful it is hard to beat. Now that I know my top end I can really refine my hunting loads without worrying if I'm pushing it too much. I think I may try some 225 grain AB, as soon as I get my honey dew list caught up.
Mathematically I should draw a coveted any bull tag this year. I've been hunting spikes in the same unit for 18 years accumulating preference points. Every year I see some really good bulls scoring high 300s. I'll be counting on the rifle to complete this mission. Thanks again for everyone's help.
Mathematically I should draw a coveted any bull tag this year. I've been hunting spikes in the same unit for 18 years accumulating preference points. Every year I see some really good bulls scoring high 300s. I'll be counting on the rifle to complete this mission. Thanks again for everyone's help.
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salmonchaser
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Tried some 7828sec today. Two 3 shot groups at 425 and 439. This was with Nosler Partition 250 grain. No chronograph but should be close to 2900+-.
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- #31
salmonchaser
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My best efforts indicate the 250 grain Partition touches the lands at 3.75. The longest round I can get to function in the magazine is 3.67. Factory speck would be 3.60. The very best groups, call it .25 are achieved when I fire form my cases, the Jarrett shoulder is moved slightly forward. When I do so I use a lighter charge and set the bullets right into the lands to keep everything centered.
Any thoughts on reducing my overall length for better accuracy. I'm not really complaining about .425 with a 250 grain Partition and 2950 fps, but it would be nice to get my hunting loads down to .25 inch.
Any thoughts on reducing my overall length for better accuracy. I'm not really complaining about .425 with a 250 grain Partition and 2950 fps, but it would be nice to get my hunting loads down to .25 inch.
Partitions aren't known for extreme accuracy like some of the other bullets so I'd feel pretty happy about shooting in the .4's.
I'm not sure what action your running but if it's a Remington or clone then you can install a Wyatt's magazine box so you can run .11" longer OAL.
I'm not sure what action your running but if it's a Remington or clone then you can install a Wyatt's magazine box so you can run .11" longer OAL.
- Nov 4, 2004
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The fast 338's can shoot lights out with the right loads.
338 RUM 250 gr PT, 4 shot group
338 RUM 250 gr AB
JD338
338 RUM 250 gr PT, 4 shot group
338 RUM 250 gr AB
JD338
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salmonchaser
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Certainly the rifle is adequate for its mission, elk out to 400 yards and no qualms with using the Partition. I've been a very fortunate elk hunter for 45 years and most of those have been taken with partitions in a variety of calibers. The last three with the Jarrett fell to AccuBond. Those were all within a mile of each other, all were spikes at ranges from 38 yards to 380. (Over 4 seasons)
The day I shot those two great groups with the partitions I also had a couple of .75 inch groups with the AccuBond. I've learned a lot this winter after joining this site, I've ordered neck turning tools, never done that before and I'll be ordering the new magazine box Monday. My guess is I'll be able to get the AccuBond to shoots well.
Once again I appreciate the help
Go hawks.
The day I shot those two great groups with the partitions I also had a couple of .75 inch groups with the AccuBond. I've learned a lot this winter after joining this site, I've ordered neck turning tools, never done that before and I'll be ordering the new magazine box Monday. My guess is I'll be able to get the AccuBond to shoots well.
Once again I appreciate the help
Go hawks.
- Nov 4, 2004
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Play with the COL and you should have the 250 gr AB's singing.
JD338
JD338
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salmonchaser
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JD338 those are two perfect groups with two different bullets, what a perfect rifle. Great to have options if elk season starts next week and you only have one or the other bullet available. I hope to have that utility with my Jarrett. I noticed a similar trait in my rifle to yours. The rifle was zeroed 2 inches high at 100 yards using 250 grain AccuBond and rl 19. With 7828 and the AccuBond the group simply shifted up about .75 inches. The Nosler Partition was about an inch left as yours appears to be.
