H4350, 24" 1:10tw, I will dig out and post up. H4350 is lot faster burn rate than H4831.
25-06 Ackley Improved velocities
- Thread starter Koda_
- Start date
Help Support Long Range Hunting Forum
AussieWriter
Active Member
Barrel life is individual to a barrel. No 2 will behave exactly the same. I have cooked a barrel in 850 rounds where groups continued to get larger for the next 150 rounds where I pulled the barrel.
Alternatively, I have burned a barrel so it looks like very bad alligator skin in the throat with small pieces beginning to fall away and that barrel still shoots inside a cent coin. When a rifle is capable of head shooting a sparrow, you leave it alone.
The powders chosen and the heat generated by the gasses produced wears the barrel, not the 100fps.
Justice1327
Well-Known Member
updated info to my 2506 fire forming loads
Increase the charge weight to 51.5 grains
Now that I have 100 pieces fire form, I will load up the newly formed AI cartridges and see what we get
51.5g (+/- .2 ) of IMR4350 behind a 117g SBT. COAL 3.1750. H2O capacity was 65.8.
New case is 72.2
Increase the charge weight to 51.5 grains
Now that I have 100 pieces fire form, I will load up the newly formed AI cartridges and see what we get
51.5g (+/- .2 ) of IMR4350 behind a 117g SBT. COAL 3.1750. H2O capacity was 65.8.
New case is 72.2
Attachments
Last edited:
Good time to use up some older supplies. Coming right along 
Justice1327
Well-Known Member
Last update on increased velocity of a 25-06AI.
As a recap. I use Winchester virgin 25-06 Brass. 51.5 grains of IMR 4350 gave me a nice crisp shoulder fire forming. Average velocity was 3046 FPS. This was with a Sierra 117SBT. after the fire forming, Shot a few at 53 to 55 grains of IMR 4350 fairly anemic in velocity . then increased it to 56 to 58 grains… good solid velocity and excellent accuracy.
Attached are the pictures of the groups with two shots with each. No pressure all the way up to 58 grains. This left the powder at the neck and shoulder junction.
Average increase was 356 ft./s
Not typical in a long action …I usually see 250 ft./s in a short action I see about 150.
As a recap. I use Winchester virgin 25-06 Brass. 51.5 grains of IMR 4350 gave me a nice crisp shoulder fire forming. Average velocity was 3046 FPS. This was with a Sierra 117SBT. after the fire forming, Shot a few at 53 to 55 grains of IMR 4350 fairly anemic in velocity . then increased it to 56 to 58 grains… good solid velocity and excellent accuracy.
Attached are the pictures of the groups with two shots with each. No pressure all the way up to 58 grains. This left the powder at the neck and shoulder junction.
Average increase was 356 ft./s
Not typical in a long action …I usually see 250 ft./s in a short action I see about 150.
Attachments
Last edited:
That's a generous layer of smackem you added, Justice.
Making me want some WW brass! I'm loaded down with Peterson though.
Making me want some WW brass! I'm loaded down with Peterson though.
@Justice1327 nice work going the extra mile to maximize the potential of the ackley chamber and nice groups, thats some impressive velocity with a 117gn in a quarterbore. Some criticism on ackley improving even further back in this thread is proven wrong, Im glad I went down the path on the other recommendations here.
Any experience in what a 133-134g velocity would be?
Some years ago, I shot the 100g at 3580 in a K&P barrel I had in the 25/06 AI with Win brass. I put some massive holes in coyotes using R#22.
Some years ago, I shot the 100g at 3580 in a K&P barrel I had in the 25/06 AI with Win brass. I put some massive holes in coyotes using R#22.
Keith I was getting 3200-3300 testing different powders for a "maximum" with 133 Bergers in the Sherman LA. This was using very mellow Nosler brass formed from
.270 Win.
I dont personally, but fresh in my mind researching powder to use I was recommended by someone in another forum shooting my same bullet to try N570 for max velocity, he was getting 3250 I think with the 127HHT.
Sounds great! We have been killing deer with the 257 Weatherby using 115g Bergers, and NOT one has taken a step after bullet impact!
Justice1327
Well-Known Member
Have you shot 110-117g? What velocity?That's a generous layer of smackem you added, Justice.
Making me want some WW brass! I'm loaded down with Peterson though.
I actually purchased some Peterson 270 brass here with the intention of using it for the 25–06 AI
The 115 Ballistic Tips ran a tad over 3550 with R23, maximum, with Peterson brass.
My AI hunting load used 110 AB's at 3420 with h4831, R-P brass. Can't recall the max, been too long. That was before I used VV powders.
My AI hunting load used 110 AB's at 3420 with h4831, R-P brass. Can't recall the max, been too long. That was before I used VV powders.
Justice1327
Well-Known Member
Yeah, gonna try RL23 with 110tgk…should work in a 1:9 twist
