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.