280AI Necked to 338 Neck Length Question

[elkaholic]

If the 338 Sherman can make use of RL-26, based on some very rough estimates, my best guess is the high accuracy node will come in around 2830 with the Berger 250, from a 26" barrel, which should give it very similar drop and drift numbers to the 215 Berger/300 Win Mag combination.

If that proves out, it would be pretty remarkable from a case in the -06 family.

RL-17 looks like it would still be the powder to beat with the lighter bullets. As you stated, the 200 grain class bullets look like they will run @ 3100 or so.

Well, I have had the flag thrown a couple of times, so this is good news The proof will still be in the magneto speed but I am expecting pretty amazing things from this cartridge. It will really open some doors for an '06 sized case that would perform at or above a factory loaded 338WM. I see some real possibilities for an elk, moose and even large bear round. I was not thinking of this as a long range round originally but with a 250 Berger and a G7 of .351, this thing will only need about 25+ moa at 1000 yards and will be packin' nearly 3/4 ton of energy!......Rich

 

[hseII]

Well, I have had the flag thrown a couple of times, so this is good news The proof will still be in the magneto speed but I am expecting pretty amazing things from this cartridge. It will really open some doors for an '06 sized case that would perform at or above a factory loaded 338WM. I see some real possibilities for an elk, moose and even large bear round. I was not thinking of this as a long range round originally but with a 250 Berger and a G7 of .351, this thing will only need about 25+ moa at 1000 yards and will be packin' nearly 3/4 ton of energy!......Rich

I'm Gathering Up Stuff: I can't decide if I'm going with:

1. MRC Mod70 LH
2. Mod70 LH
3. R700LH

Mainly because I'm having trouble finding a Mod70LH action by itself, the MRC is a 5-7mon the wait, & the R700 action is basically in the same ballpark $ wise, by the time it is ready to go.

In the Mean time,

What is the Preferred Brass?

I have some .270 Win Brass of all different makes, but if there is something more preferred, I'm all Ears.

What's the lead Time & $ for the dies?

Will the dies include whatever I need to resize .270/.280 Brass?

I wish there was a sticky for the 338 Sherman, & all other of Sherman's Shermans.

Thanks

 

[elkaholic]

I'm Gathering Up Stuff: I can't decide if I'm going with:

1. MRC Mod70 LH
2. Mod70 LH
3. R700LH

Mainly because I'm having trouble finding a Mod70LH action by itself, the MRC is a 5-7mon the wait, & the R700 action is basically in the same ballpark $ wise, by the time it is ready to go.

In the Mean time,

What is the Preferred Brass?

I have some .270 Win Brass of all different makes, but if there is something more preferred, I'm all Ears.

What's the lead Time & $ for the dies?

Will the dies include whatever I need to resize .270/.280 Brass?

I wish there was a sticky for the 338 Sherman, & all other of Sherman's Shermans. ��

Thanks

The preferred brass is 280 or 270 Norma IMO with RWS and maybe PRVI too.
I can have dies in 2 months and will likely have them in stock all the time anyway. ($260 includes shipping)
You would need some kind of 30 cal. expander to step up the 270. I have had good results by just going 30 and then to 338. Once you neck them to 338 you just load a bullet jammed into the lands and fire away. I usually reduce the load about 10% when doing this. There is more info on the 338 Sherman thread. It looks like at least 2850 will be possible with a 250 in a 24" barrel based on early testing where 2802' was reached without too much pressure....Rich

 

[hseII]

The preferred brass is 280 or 270 Norma IMO with RWS and maybe PRVI too.
I can have dies in 2 months and will likely have them in stock all the time anyway. ($260 includes shipping)
You would need some kind of 30 cal. expander to step up the 270. I have had good results by just going 30 and then to 338. Once you neck them to 338 you just load a bullet jammed into the lands and fire away. I usually reduce the load about 10% when doing this. There is more info on the 338 Sherman thread. It looks like at least 2850 will be possible with a 250 in a 24" barrel based on early testing where 2802' was reached without too much pressure....Rich

I need a bit of help selecting a .30 cal Expander-
Lyman Neck Expander M Die 30 Cal Long

Something like this?

Thank you

 

[elkaholic]

I need a bit of help selecting a .30 cal Expander-
Lyman Neck Expander M Die 30 Cal Long

Something like this?

Thank you

Never used one but it should work just fine. If you have any sizer dies already in 30 cal, you could just use the expander on what you have?......Rich

 

[hseII]

Never used one but it should work just fine. If you have any sizer dies already in 30 cal, you could just use the expander on what you have?......Rich

I'll admit it: the only 30 cal dies I have are .308 & .300 WM. I suppose those will work?

 

[elkaholic]

I'll admit it: the only 30 cal dies I have are .308 & .300 WM. I suppose those will work?

Yup just run them through the expander......Rich