284 WIN Throat Length

[wabash503]

RS Nation,

For you guys running 284 WIN, what's bullets are you running and what throat length / reamer did you go with? I'm pretty interested in this cartridge, but want to know more about getting the throat right for high b.c. bullets in 165-175 grains. Similar to the Nosler ABLRs or Berger VLDs. Thanks!

 

[pods8 (Rugged Stitching)]

I have a 284WIN barrel from PBB that they say is a sammi reamer. It that is accurate the throat has plenty of room to seat all of those optimally and not be on the lands, I can't find my notes on all the bullets I measured but my preliminary measurements has the 162ELDM at ~3.187 COAL touching the lands, which with the bullet seated optimally is ~0.06" off. There is plenty of neck to support the bullet if wanting to get closer to the lands. Hope that helps.

 

[wind gypsy]

284 win SAAMI chamber has an older style throat that doesn't have freebore. Rather, it starts at a significantly over bore dimension 0.290" in front of the case mouth and has a constant taper until it it is below groove diameter. Most custom designed chambers or new cartridges now use a parallel freebore slightly larger than the bullet diameter and then a shorter lead instead. How important that is or isnt i cant say but I'd probably look for that if having a custom barrel made.

Keep in mind, freebore diameter and leade angle play into how far a bullet has to move forward before making contact with the lands in addition to freebore length.

I have a 284WIN barrel from PBB that they say is a sammi reamer. It that is accurate the throat has plenty of room to seat all of those optimally and not be on the lands, I can't find my notes on all the bullets I measured but my preliminary measurements has the 162ELDM at ~3.187 COAL touching the lands, which with the bullet seated optimally is ~0.06" off. There is plenty of neck to support the bullet if wanting to get closer to the lands. Hope that helps.

If you're seating a 162 eld optimally puts it 0.006" off the lands, that still is a little shorter than Id think ideal and a longer bullet will be in the donut area. Not saying theres any reason that wouldn't work acceptably though.

 

[pods8 (Rugged Stitching)]

If you're seating a 162 eld optimally puts it 0.006" off the lands, that still is a little shorter than Id think ideal and a longer bullet will be in the donut area. Not saying theres any reason that wouldn't work acceptably though.

~0.060" not 0.006"

 

[wind gypsy]

~0.060" not 0.006"

Ahh, sorry. Burned by decimals again.

 

[Hill Difficulty]

Hi OP

My 284WIN rifle has a Carbon Six barrel. Was told they used a Manson reamer w/a 2019 design date (+ C6 described as SAAMI chambering).

So far I've loaded 3 different bullets using RL26. 165 TGK, 175 EH, and 195 EOL. Accuracy for all 3 bullets is impressive with wide/forgiving nodes, easy to load for. Rifle has a medium action length so mags can fit up to 3.25" OAL. To contact with lands, each bullet measures TGK @ 3.22", EH @ 3.24", and the EOL @ 3.31".

Also have a very accurate 7WSM (Benchmark) throated to shoot 195 EOLs. Can load a bit longer with my 284WIN, both are ideal for maxing out a medium length magazine. 165 TGK bullet is my easy favorite for both rifles.

Hope this helps!

Shameless plug: I have 100 pieces of 284WIN brass listed for sale if anyone is interested. See ad under gun classifieds.

 

[mattminative]

Hi OP

My 284WIN rifle has a Carbon Six barrel. Was told they used a Manson reamer w/a 2019 design date (+ C6 described as SAAMI chambering).

So far I've loaded 3 different bullets using RL26. 165 TGK, 175 EH, and 195 EOL. Accuracy for all 3 bullets is impressive with wide/forgiving nodes, easy to load for. Rifle has a medium action length so mags can fit up to 3.25" OAL. To contact with lands, each bullet measures TGK @ 3.22", EH @ 3.24", and the EOL @ 3.31".

Also have a very accurate 7WSM (Benchmark) throated to shoot 195 EOLs. Can load a bit longer with my 284WIN, both are ideal for maxing out a medium length magazine. 165 TGK bullet is my easy favorite for both rifles.

Hope this helps!

Shameless plug: I have 100 pieces of 284WIN brass listed for sale if anyone is interested. See ad under gun classifieds.

How does the carbon 6 .284 barrel shoot? I just ordered one. Sent some dummy rounds in with 168 bergers set out pretty far. They mentioned to me that the saami reamer they have (the Manson you mentioned) would likely work but they would throat if necessary. Ordered mine at 21”.

 

[Hill Difficulty]

How does the carbon 6 .284 barrel shoot? I just ordered one. Sent some dummy rounds in with 168 bergers set out pretty far. They mentioned to me that the saami reamer they have (the Manson you mentioned) would likely work but they would throat if necessary. Ordered mine at 21”.

Hi Matt

Barrel is exceptionally accurate - impressive/very pleased.

My barrel's chambering is perfect for loading longer bullets in a medium-length action and 3.25" OAL magazines. Would NOT lengthen the throat.

 

[mattminative]

Hi Matt

Barrel is exceptionally accurate - impressive/very pleased.

My barrel's chambering is perfect for loading longer bullets in a medium-length action and 3.25" OAL magazines. Would NOT lengthen the throat.

Awesome good to hear. Carbon six didnt think they would need to lengthen the throat but wanted me to send a few rounds in just to be sure. Got any pics of your setup?

 

[Hill Difficulty]

Sorry, no pics yet. Right now it's a barreled action sitting in a safe. Was using a XLR chassis from another rifle while waiting for a RokStok + still need to paint the shank and muzzle ends. I'll get motivated when the stock shows up...

What action and length will you be using?

 

[mattminative]

Sorry, no pics yet. Right now it's a barreled action sitting in a safe. Was using a XLR chassis from another rifle while waiting for a RokStok + still need to paint the shank and muzzle ends. I'll get motivated when the stock shows up...

What action and length will you be using?

Ive got a tikka t3 that I’ll be putting the carbon six on. Rokstok is an option that Ill be looking at also.
I currently have a long action Ruger American with a SS mcgowen 284 win barrel. Good shooter also but looking forward to building a tikka.
Will be looking for updates on yours when you wrap it up.
How long of a barrel did you go with?

 

[Hill Difficulty]

Barrel is 22" OAL, Zermatt tenon, featherlight taper, threaded muzzle w/a C6 radial brake that extends the taper.

 

[Hill Difficulty]

Will be looking for updates on yours when you wrap it up.

Hi Matt

Will probably regret it but decided to sell... Just posted under Classifieds if you want to see photos in a XLR chassis.

 

[solarshooter]

I have a Benchmark chambered with a PTG reamer with 0.188" freebore in straight 284. This is on a Tikka converted to long action and using long action mags. My preferred bullet is the Berger 175 EH, jam COAL is 3.276, I load it to ~0.030" jump for a coal of 3.245", boattail/bearing surface junction sits just above the neck/shoulder junction.

Edit: Adding some detail on the reamer, freebore diameter is 0.2845", and it is cylindrical. Not sure on leade angle but I believe it is 1'30" like many common match chamber designs.