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280AI Necked to 338 Neck Length Question

 
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  #15  
Old 06-07-2013, 11:44 AM
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Re: 280AI Necked to 338 Neck Length Question

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Originally Posted by elkaholic View Post
You should have no problem getting the velocities that you are looking for. The .338 Sherman would probably hold approx. two more grains than a .300 Sherman which would put it near 79 grains. IMR 4831 would work well as would H4350, RL17 and even up to RL22 with the heavier bullets. You would have to fire form the Sherman by using a false shoulder. If you wanted MAXIMUM velocity gain, the Sherman would do it but if the extra hassle is not worth it to you, the gain would not be that much.......Rich
Based on capacity gain, it looks like the 338-280AI would be roughly in the middle between the 338-06 and the 338 Sherman. I was running some rough estimates of 338-280AI velocities based on Hodgdon 338-06 data and it looked to me like I would be able to meet or exceed my stated goals fairly easily. The numbers I was getting were fairly close to what I know good handloads for the .338WM will produce. All of that makes me think that there is a fair probability that a .338 Sherman would just slightly outperform the .338WM. I find that possibility intriguing.

As for the false shoulder, would a .35 Whelen neck sizer die do the job? I am conflicted between going the easy route with the wildcat or going all the way and building a Sherman. In the end, MAX performance may be hard to resist. I also see the opportunity to learn a few extra reloading tricks as a net plus.

Hmmmmm...
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  #16  
Old 06-07-2013, 11:54 AM
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Re: 280AI Necked to 338 Neck Length Question

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Originally Posted by TOM H View Post
If you took 280AI neck it up to 338 that case would hold app 71gr/R-17 to the top of the case mouth and if you filled to the start of the neck it be appr 65.5gr/R-17. The 35 WhelenAI to the top of the case mouth it hold appr 72.gr/R-17 and do same to 30x280AI it hold appr 70.5gr/R-17. A new 280AI case filler to case mouth hold appr 70gr/R-17.

You going to run pretty close to 338-06AI velocity and I would use 338-06 data as start loads.
When I was quoting case capacity, I forgot to note that I was going by grains of water. Having actual information on the likely case capacity with the powder that I want to use gives me a clearer idea of what I could expect. That is some excellent information! Thank you!

I concur with your thoughts about using 338-06 data as starting loads.
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  #17  
Old 06-07-2013, 12:10 PM
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Re: 280AI Necked to 338 Neck Length Question

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Originally Posted by benchracer View Post
Based on capacity gain, it looks like the 338-280AI would be roughly in the middle between the 338-06 and the 338 Sherman. I was running some rough estimates of 338-280AI velocities based on Hodgdon 338-06 data and it looked to me like I would be able to meet or exceed my stated goals fairly easily. The numbers I was getting were fairly close to what I know good handloads for the .338WM will produce. All of that makes me think that there is a fair probability that a .338 Sherman would just slightly outperform the .338WM. I find that possibility intriguing.

As for the false shoulder, would a .35 Whelen neck sizer die do the job? I am conflicted between going the easy route with the wildcat or going all the way and building a Sherman. In the end, MAX performance may be hard to resist. I also see the opportunity to learn a few extra reloading tricks as a net plus.

Hmmmmm...
I don't know that you could exceed the WM but you would be very close behind with less powder and a non-belted case which is a plus. My 300 Sherman is not far behind a 300 WM so that is what I base it on. I forgot to address your question regarding the chamber reaming! I do not have a .338 Sherman reamer so you would either have to use a .338'06 reamer first to get the neck dimension and then clean up with a 300 Sherman reamer or use the Sherman first and use a .338 neck reamer. I've always wanted to increase the "Sherman Family" to include a .338 as I think it would be pretty impressive for the case capacity and would work nicely on a std. actiion. So many options and so little $$$$$......Rich
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  #18  
Old 06-07-2013, 04:20 PM
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Re: 280AI Necked to 338 Neck Length Question

Quote:
Originally Posted by benchracer View Post
When I was quoting case capacity, I forgot to note that I was going by grains of water. Having actual information on the likely case capacity with the powder that I want to use gives me a clearer idea of what I could expect. That is some excellent information! Thank you!

I concur with your thoughts about using 338-06 data as starting loads.

The Nosler 280AI case length is 2.525 and neck length is .345". After my got her 280AI I had 30-280AI build and after I got few cases fire formed I neck up some to 338.

I've got a set of dies for a 338-270HGT and the body length is 2.090" has 40 degree shoulders and neck length is .370" and case length is 2.490" long. there is article in Wildcat Cartridges Vol II page 461 about this wildcat and it's about the only written information about this case. It's pretty close to a 338x280AI. they have data for a 200gr Speer@ 2900fps plus and 250gr Sierra mid 2600fps.

I used 280 cases to fire form reason for that 270 case to the shoulders is 1.948" and the 280 length to shoulders was 1.999". I have the dies in storage not sure if I have any cases and if your interested you can have reamer made from the dies and I'll send along the loading data and it be a good start on something no one else has. You have to talk to reamer guy might be able to use 280AI reamer any way if your interested PM me and you can have them.
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  #19  
Old 06-16-2013, 07:52 AM
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Join Date: Dec 2009
Posts: 746
Re: 280AI Necked to 338 Neck Length Question

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Originally Posted by TOM H View Post
The Nosler 280AI case length is 2.525 and neck length is .345". After my got her 280AI I had 30-280AI build and after I got few cases fire formed I neck up some to 338.

I've got a set of dies for a 338-270HGT and the body length is 2.090" has 40 degree shoulders and neck length is .370" and case length is 2.490" long. there is article in Wildcat Cartridges Vol II page 461 about this wildcat and it's about the only written information about this case. It's pretty close to a 338x280AI. they have data for a 200gr Speer@ 2900fps plus and 250gr Sierra mid 2600fps.

I used 280 cases to fire form reason for that 270 case to the shoulders is 1.948" and the 280 length to shoulders was 1.999". I have the dies in storage not sure if I have any cases and if your interested you can have reamer made from the dies and I'll send along the loading data and it be a good start on something no one else has. You have to talk to reamer guy might be able to use 280AI reamer any way if your interested PM me and you can have them.
TOM H, thank you for a very generous offer. I will keep your offer in mind. I am still figuring out what I am going to do. When I have the parts I need for the build, I will talk things over with my smith. The outcome of that conversation will have a large impact on my final decision.


If elkaholic ever decides to go ahead with development of his .338 SHERMAN, I hope to be involved somehow. I may just decide to go simple for now and wait for Rich before I go the whole nine yards...
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