284 shehane reloading help

[articmp]

I am about to begin loading some rounds for my new 284 Shehane. I made a dummy round with a piece of brass and a berger 180. At my current seater setting, I have about 0.1" inch of rifling "shine" on the bullet. Too much? Would 50 grn of R17 be about right for tight neck, turned brass,savage SA, new Douglas 1-9 barrel, with berger 168 or 180's? This my first modified chamber, so for me this is uncharted ground.

 

[newboy]

RL 17 around 52grn works well in some rifles the other powder to use is h4831sc about 57-58 grns this works well with berger vld180s ccibr primers .

This will give you mid 2950fps ish , expect your barrel to speed up around 100fps after 100/150 rounds through a new barrel, so your first few rounds through a new barrel may be a bit slower than you have hoped for.

Make sure you have around 4 thou clearance in the neck in your chamber with a loaded round.(if your chamber is 312 then your loaded round should measure 308ect)

You only need 1 to 1.5 thou neck tention

There are one or two little tricks to loading the shehane all based around neck wall thickness with a tight neck chambering and doghnuts at the base of the neck shoulder, get these sorted and you will have a real v bull machine out to 1000yrds .

 

[effendude]

I started with this spring with a new Shehane. Barnard action, 30" Bartlein 5R barrel, Lapua brass necked up and turned with Federal 210M primers. After a few rounds of barrel break-in, I ran pressure tests with both RL-17 and H4831SC loading the 180 Hybrid. I stopped at 58 grains with both powders, not because of pressure signs or bolt lift, but because all the info on the net said that was high enough. RL-17 gave better velocities, but seemed loose on the target while doing preliminary testing. I focused on H4831SC after the initial tests.

Ladder tests showed a real sweet spot at 56 to 57 grains of powder over many tests at 300 yards, less than 3/8" vertical, even with fireforming. .001 neck tension, with a slight jam into the lands. I settled on 56.5 grains of SC, running about 2930 when the barrel had about 100 rounds down it. I honestly never experimented with different seating depths because the soft jam shot so well right from the start. The barrel now has 850 rounds through it and still shoots great. I am not sure how much life is left in it so I am pampering it now by only shooting select matches with it.

Scott

 

[21shooter]

Hi Art, I just got back from camp perry (1000yd F-Open)I have been working
on a load to compeate while fireforming 7mm 284 to shehane. With this load I have little to no verticle. I did shoot a 195-3x fireforming.I think this is pretty good considering this is my 3rd 1000yrd event, Perry is a very hard place to read conditions. I am using a light load 4831sc , berger 168 vld's just on the lands.
Thanks, Shoot Well, John R Perkins Jr.
For the BEST reloading tools ----21St Century Shooting Inc.
www.xxicsi.com

 

[articmp]

I am using lapua resized and turned brass also. We just got a new Cabela's in Charleston,WV. Browsed a bit and noticed they did have bagged 284 winchester on the shelf. May have to buy a bag just to load hunting rounds and get a feel for neck turning. Would almost cry if I lost a piece of that Lapua.