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257 Ackley Improved. 80 grain Bullets an RL 19

This is the Barnes listing: RL-15, IMR 4007SSC, H414 (most accurate they tested), IMR 4350, Hunter, Hybrid 100V. Many other powders will work.

Edit: I'm going to be testing both N140 and N540 in my 250 Ackley.
 
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I’m in the process of developing loads for a wild hog hunt. Planning to load the Barnes 80 grain TTSX solid bullets. Anybody have experiebpnce with RL 19? Other powders?


Thanks
I tested a number of powders with the Barnes 80 gr ttsx. In my rifle 52.5 gr of H-414 was hard to beat with a jagged 1 hole group and N-550 also shot very well. A very accurate cartridge. In my testing, the worst group was under 1” with this bullet. I took 2 white tails with it last winter and they both dropped no problem. The bullet busting thru ribs on both sides and exited. Both were shot at 100 yds.
 
Roger the Superformance - another under-hyped, under used, but very good performer.;) I won't [yet] reveal the velocity I achieved via H-Superformance and 138 Gr. BT, via my latest .257 Ack. Imp. barrel - a 24", 1:8" twist, 4-groove, Bartlein. :) Have yet to try the RL-17 with the 138s - only had time for one brief range session, which showed promise. H-Superformance has been great stuff, for the .257IdiotMag (.25/300WSM): 110 Gr. BT at 3540 &, again, well short of case-wrecking pressure. Can't recall which came first - probably the Superformance, asit was one of the first powders we tried in the .257 IdiotMag, for which Hugh Henriksen made a reamer as soon as Win. spec'd the .300WSM - that's been a great coyote, pronghorn, and mule deer slayer . . . but, so is a .257 Wby.! :eek::DRG
What COAL were you running with the 138s. I’m trying to extrapolate a good place to start with loading for the 131gr Blackjack but I’m using a COAL of 3.200”. This puts the base of the bullet at 1.760” (same as a Nosler 120gr Partition loaded to 2.935” COAL). I know to back off and work up. I’m actually trying to keep it between 3100-3200fps.

Also if anybody wants to run Quickload for:
120gr Partition seated to 2.935”
Max 58,000 PSI
Max fill @ 105%
25” Barrel, 1:7.5 twist
Powders of interest: IMR 7977, Hybrid100V, Norma MRP
 
I just received my .257 AI build. Although it has a 9 twist barrel for heavier bullets, I am trying IMR 4451. Broke the barrel in with it and it seems to have a good potential. I do like the copper eraser factor. Burn rate similar to 4350. Good luck.
 
I fireformed some brass a couple weeks ago over a max Roberts charge of 4350 behind 117 SST pills. Ended up shooting under 2” at 400yds with that load. The image is 2 - 5shot groups, from 2 shooters, using the impact just above as the point of aim.

I didn’t get any pictures of the 131gr Ace groups, since the range mud was like sponge cake... But everything was under .5” with 0.5gr charge increments. Expecting good things, especially as the barrel is starting to break in. Waiting for my Arcalock rail/clamp and bipod to come in before finishing load development.
 

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