Latest thinking on 7mm twist rates for 180 hybrids; Freebore and Neck Thickness

[FeMan]

My straight 284 loads are 3.325 coal with 184 Hybrids in a 0.235 freebore chamber with a high round count.

 

[WindSurgeon]

If you don't already have a barrel, I'd got with at least an 8.5 twist.

Lloyd

I wish I had the barrel. I have a post up looking for a Brux barrel. No luck so far. Thank you!

 

[littlebuddybr]

What kind of velocity are you guy's getting with the 284 and 184 hybrids?

And the shehane also?

 

[FeMan]

In 30 inch barrel I had them up to 2900 with 4831sc but they still shoot best at 2770 to 2810. Same as the shorter barrels. That’s where I run them whether using 4350 or 4831.

 

[KenOath]

In 30 inch barrel I had them up to 2900 with 4831sc but they still shoot best at 2770 to 2810. Same as the shorter barrels. That’s where I run them whether using 4350 or 4831.

My experience also between these speeds ( 2770-2810) with 4350, had a Kreiger and Bartlein that shot just as well at 2740fps as well..

 

[littlebuddybr]

My experience also between these speeds ( 2770-2810) with 4350, had a Kreiger and Bartlein that shot just as well at 2740fps as well..

Thanks

 

[WindSurgeon]

Update: Sold my reamer mentioned in the original post. My smith has a reamer with .317 neck and a short freebore, but will use a throat reamer to make the FB .220. For shooting Berger 180 or 184 hybrids. What do you all think?

Also, found a 33" Kreiger 1.25 strait in 7mm.

 

[LA50SHOOTER]

Anyone using Norma MRP in a 284 Win. or Shehane with heavy bullets ? And if so how did it do ?

 

[KenOath]

Update: Sold my reamer mentioned in the original post. My smith has a reamer with .317 neck and a short freebore, but will use a throat reamer to make the FB .220. For shooting Berger 180 or 184 hybrids. What do you all think?

Also, found a 33" Kreiger 1.25 strait in 7mm.

Chamber up and go shoot the 180... can’t see a problem there.

 

[WindSurgeon]

Anyone using Norma MRP in a 284 Win. or Shehane with heavy bullets ? And if so how did it do ?

Do you mean the 190's or the 180's .284? I have not seen anyone shooting the 190's in competition, but the 180's are seemingly the standard now and work great.

 

[LA50SHOOTER]

Do you mean the 190's or the 180's .284? I have not seen anyone shooting the 190's in competition, but the 180's are seemingly the standard now and work great.

Yes, 180's, 183's, 184's & 190's - Norma MRP is slower than H-4831sc - I ran some Quick-Load scenarios with MRP as the powder & with heavier bullets (184'sw & 190's) it looked like it could show promise.
I was looking to see if any Forum members had possibly tried it.

 

[Capt. Oblivious]

MRP works very well with the heavies, good speed as well.
Almost anything from 243 to 300WM it brings some reel good speed with the heavy in class bullets, works real good in the Sherman's and 284's