25-284 build

ButterBean

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I've got Retumbo and H1000 but been hearing the RL26 to be the "go too" powder for this cartridge. Also V560/570 on my bench. This is just break in load starting charges I'm looking for. Guessing around 50 grains of either 4831 or RL26. I can get to pressure testing later. Just want a mild deer load for this year using the lighter bullets locally.
I apologize your gonna run the Blackjacks, RL26 may very well be your best bet
 

willfrye027

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I just ordered a 25x284 prefit with a 1:7.5, will be interesting to see what loads are working well for guys. Not a ton of load data out there yet. Scored some Peterson 6.5x284 brass hopefully don’t end up needing to neck turn
 

VLD Pilot

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I just ordered a 25x284 prefit with a 1:7.5, will be interesting to see what loads are working well for guys. Not a ton of load data out there yet. Scored some Peterson 6.5x284 brass hopefully don’t end up needing to neck turn
There's alot of load data that members have that shoot that cartridge. If any could post a few starting loads ( not looking for any honey loads) for where to begin. I can run up to pressure and find accuracy along the way. It's just nice having a safe reasonable place to start.
 

highdrum

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I'd start around 53gr with RL26. Should be very conservative, as I ran 53.7gr rl26 with 156s in my 6.5x284 peterson brass that holds 2gr less than lapua.
 

willfrye027

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I'd start around 53gr with RL26. Should be very conservative, as I ran 53.7gr rl26 with 156s in my 6.5x284 peterson brass that holds 2gr less than lapua.
How was that Peterson brass compared to lapua? Are the necks much thicker?
 

highdrum

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How was that Peterson brass compared to lapua? Are the necks much thicker?
I had 284 peterson prior to their release of 6.5x284. So it was a turn then neck down. But yes it was thicker. I still had to turn the Lapua 6.5x284 a half thou per side for my personal desired clearance of 5k w/ loaded vs chamber. It's good brass but doesn't make the same velocity as lapua. I think the case heads are harder but the web area isn't as strong as lapua.
 

lee31

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Anybody have any starting load data for this cartridge with RL26 and/or H4831sc ? Breaking this in with 120 Sierra's but plan on shooting the 131s primarily.
Start around 48 grains with h4831sc and 49 RL26 for the 131s. Do a ladder test from there til you hit pressure. I’d start even lower with the 120s as they have a lot more bearing surface.
 

Frank in the Laurels

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In all honestly, what can any of those mentioned do that the 75 year old 25/06 has been doing for decades with no pain, anxiety or expense...not much experimentation done in .257 because of the limiting bullet offerings overall. Either way, good luck, have fun and hopefully someone will make a few more bullets for .257...
 

VLD Pilot

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In all honestly, what can any of those mentioned do that the 75 year old 25/06 has been doing for decades with no pain, anxiety or expense...not much experimentation done in .257 because of the limiting bullet offerings overall. Either way, good luck, have fun and hopefully someone will make a few more bullets for .257...
Probably nothing. Accuracy may be better as the shorter fatter longer neck cartridges seem to have that accuracy edge. All things 284 seem very accurate. That's why I'm building mine. That and because I have a truck load of Lapua 6.5-284 brass. No real advantage otherwise IMO. Just gonna be a fun new rifle to have.
 

willfrye027

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In all honestly, what can any of those mentioned do that the 75 year old 25/06 has been doing for decades with no pain, anxiety or expense...not much experimentation done in .257 because of the limiting bullet offerings overall. Either way, good luck, have fun and hopefully someone will make a few more bullets for .257...
Why? Because it will fit in my tikka magazine while allowing me to seat the bullet way out of the case and get close to the lands..on a standard bolt face 😉

As for options now we have the 131gr blackjack (waiting on the next run of bullets of course), 135gr Berger LRHT (very available right now), 133gr Berger soon, and a variety of copper/mono options. Hopefully more to come soon..
 

ButterBean

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In all honestly, what can any of those mentioned do that the 75 year old 25/06 has been doing for decades with no pain, anxiety or expense...not much experimentation done in .257 because of the limiting bullet offerings overall. Either way, good luck, have fun and hopefully someone will make a few more bullets for .257...
What are you shooting ?
 
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