I just built a 260 Ackley with a 1:8.5" twist barrel. I've found only limited information on reloads for this using H4831sc. I'm planning on shooting the 130 and 140gr bullets. Any suggestions? Pet loads?

Hi,
my rifle has a 8,6" hammerforged barrel which is 60 cm long. The whole system is fitted in AICS. Lets have a look and let me know you experience.
You can try: Case: fireformed R-P 260Rem, Powder: H4350, 46gr, Bullet: Lapua 123grs Scenar, CCIBR2, OAL. 71,5mm
I have no idea how the put a picture in the reply. 5 shots @100m under 10mm!
Greeting from Germany

Are you looking for.260 AAR Ackley or .260 Rem Ackley data?

Just assembled my 2nd 260 AI...8 twist Pac Nor w/28" x 1.118" no taper tube & 3 groove...Savage s/shot action...using Lapua & Hornady Match 308 brass...130 NABs...140 Nosler Comp's....142 SMKs...powders like RE19...RE22..H4831sc.....H414...H4350 will all work...my best load so far with #1 project has been 46/RE19 w/moly 140 Nosler comp...2.765" OAL..Fed 210...FF'd case...2900 fps..safe in my rifle(s)...#2 project has been a bit fussy so far...but shows promise...start your loads using known safe 260 loads and work up...

I'm reloading for the .260 Rem Ackley. Since my original post, I have worked up two very accurate loads and will start on a couple others tomorrow.

The first load is 48.7g H4831sc behind a 140g Berger Match VLD and set 0.020" off the lands (2850 fps). The second load is 46.5g H4350 behind a 123g Sierra Match and set 0.015" off the lands (3105 fps). Both with CCI BR2 primers. Both of these are grouping consistently under 0.6" with a few groups down to 0.4". My best was 0.3" with the Berger VLDs. These are all five shot groups.

Heinzman357, looks like we are pretty close on the loadings for 123g bullets. Under 10mm - Nice!!!

The next trials are with Hornday 129g SST, Nosler 120g BTs and 130g Accubonds. I'm also experimenting with RE-17 and RE-19 in addition to the Hodgdon powders. I'm waiting on some Berger 130g bullets as well. I think those will be screamers in this gun.

Thanks for all the input!

Thought I'd post my latest load data. Although I designed the gun to shoot 130g bullets, it is coming in very tight with 120g Nosler Ballistic Tips. I have a load using 48.3g H4350 that is always 0.40" or smaller on every group ... and I mean every group. The best group scored 0.26". These are all at 100 yards. At 200 yards, I've only shot three groups: 0.63", 0.70" and 0.72". The velocity is averaging pretty close to 3100 fps.

The Berger 130g Match VLDs are grouping okay, but not as tight as I would have hoped for. They're staying around 0.6" and I can't seem to get them to shoot much less. I'm going to get some 123g match bullets and see what they do. Either Sierra or Lapua bullets.

BTW, the rifle is a trued Rem 700 action with a Jewell HVR trigger. It has a Rock Creek barrel and a HS Precision stock. The barrel is 26" stainless, varmint profile and fluted. The brass is fire formed Remington 260 and I've exceeded six loads now without any primer pocket or other case problems.

Good shooting, rifle and user