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Savage Shooters Forum > Firearm Accessories > Ammunition & Reloading: Wildcat Cartridges (Moderator: BillPa) > .270-08 AI (update)
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Author Topic: .270-08 AI (update)  (Read 556 times)
BobT
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« on: October 11, 2009, 11:07:27 AM »
Anybody shooting one of these? I am looking for load data, info is pretty scarce. I have some data to start with but I would like to find some more.

Thanks!
Bob
« Last Edit: November 16, 2009, 09:17:30 AM by BobT » Logged
It's better to shoot for the moon and hit the fencepost than to shoot for the fencepost and hit the ground!
trappst
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« Reply #1 on: October 11, 2009, 11:29:42 AM »
I think BillPa has one of those.  Maybe?
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BillPa
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« Reply #2 on: October 11, 2009, 09:09:59 PM »
Quote from: BobT on October 11, 2009, 11:07:27 AM
Anybody shooting one of these? I am looking for load data, info is pretty scarce. I have some data to start with but I would like to find some more.

Thanks!
Bob

A few to get you started. I only use 130s ( 12 twist barrel) , so I can't help with much anything else.

270-308 Improved
Barrel 22"
130 Grain bullet

  IMR-4320

      Load          Charge      Charge-       Muzzle        Chamber
      Density       Weight      to-Bullet     Velocity      Pressure       Notes
      (%)           (grains)    Wt. Ratio     (ft/sec)      (CUP)
-------------------------------------------------------------------------------------
       75          35.6         0.274         2399          35942          OK
       80          38.0         0.292         2561          41617          OK
       85          40.3         0.31          2716          47056          OK
       90          42.7         0.328         2877          52731          High Pressure
       95          45.1         0.347         3039          58406          High Pressure
       100         47.5         0.365         3201          64081          High Pressure

 N-140

      Load          Charge      Charge-       Muzzle        Chamber
      Density       Weight      to-Bullet     Velocity      Pressure       Notes
      (%)           (grains)    Wt. Ratio     (ft/sec)      (CUP)
-------------------------------------------------------------------------------------
       75          35.6         0.274         2354          34611          OK
       80          38.0         0.292         2513          40076          OK
       85          40.3         0.31          2665          45313          OK
       90          42.7         0.328         2823          50778          High Pressure
       95          45.1         0.347         2982          56243          High Pressure
       100         47.5         0.365         3141          61708          High Pressure

RL-15
     Load          Charge      Charge-       Muzzle        Chamber
      Density       Weight      to-Bullet     Velocity      Pressure       Notes
      (%)           (grains)    Wt. Ratio     (ft/sec)      (CUP)
-------------------------------------------------------------------------------------
       75          35.6         0.274         2421          36617          OK
       80          38.0         0.292         2584          42399          OK
       85          40.3         0.31          2741          47940          OK
       90          42.7         0.328         2904          53721          High Pressure
       95          45.1         0.347         3067          59503          High Pressure
       100         47.5         0.365         3231          65285          High Pressure


Varget
      Load          Charge      Charge-       Muzzle        Chamber
      Density       Weight      to-Bullet     Velocity      Pressure       Notes
      (%)           (grains)    Wt. Ratio     (ft/sec)      (CUP)
-------------------------------------------------------------------------------------
       75          35.6         0.274         2504          39553          OK
       80          38.0         0.292         2672          45272          OK
       85          40.3         0.31          2834          50752          High Pressure
       90          42.7         0.328         3003          56470          High Pressure
       95          45.1         0.347         3172          62189          High Pressure
       100         47.5         0.365         3341          67907          High Pressure

 

The loads I use most.  Safe for my barrel!

130, 46.5 / H4350, Fed 210, Lapua brass, 2996 FPS.
130, 45.5 /RL-15, BR2, Win brass, 3110.


Bill
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BobT
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« Reply #3 on: October 13, 2009, 10:05:46 AM »
Thanks Bill!

I really appreciate the info, I was planning to shoot 130s also. You are getting some great velocities out of a 22" barrel.

Bob
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cowboyarcher
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« Reply #4 on: October 13, 2009, 02:13:23 PM »
I'm looking forward to what you're gonna get from that 25" barrel Bob!
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BobT
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« Reply #5 on: October 14, 2009, 01:42:26 AM »
Quote from: cowboyarcher on October 13, 2009, 02:13:23 PM
I'm looking forward to what you're gonna get from that 25" barrel Bob!

Me too! It may be a while before I get to measure any velocities, my chronograph needs a little repair.

 
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BillPa
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« Reply #6 on: October 23, 2009, 11:16:26 AM »
 Bob,
 How are you making out with the "little" 270?

Bill
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BobT
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« Reply #7 on: October 28, 2009, 11:34:32 AM »
Bill,
I am still fire forming cases but I hope to have a load ready to go in time for the Missouri deer opener on the 14th. of November. I was using 45.0 IMR 4350 behind a 130 grain Remington "Bronze Point" (had a bunch of old ones) but I'm running low on 4350 so I'm going to try some IMR 4831 and see how it does. The 4350 was making nice looking cases but I'm giong to try to develop a hunting load around it since I use so much of it in other calibers I load for. I haven't really shot any groups yet but I may try to this weekend. It seems to be a very mild mannered little rascal!

Bob
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tammons
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« Reply #8 on: October 28, 2009, 11:50:29 AM »
What would be cool about this round, is the 85 gr barnes TSX bullet.

The guys over at the 6.8 SPC forum are pushing this bullet at about 2900-3000
fps and its devistating on hogs and deer.

You could probably get about 3450-3500fps out of the 270/308 with minimal recoil.

I have some test loads with the 85 grainer over a lot of powder in 270 weatherby magnum just for kicks.
Should get about 3800-3900 with it.

Going to test it out on a hog hopefully next week.
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BobT
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« Reply #9 on: November 16, 2009, 09:16:58 AM »
Well I got her going in time for deer season, the load I settled on was 46.0 IMR 4350, WLR primer and 130 grain Ballistic Silvertip. It worked well, I posted the story and a pic in the medium game forum. Getting good groups but I'm going to do more load development after deer season.

Thanks very much to all of you who have helped make this project reality! 

Bob
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BillPa
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« Reply #10 on: November 16, 2009, 11:30:17 AM »
 Howdy Bob,

 My son decided to carry the little 270 this season.....as usual I get whats left over! Angry

 BTW...I think I forgot to ask, who's reamer did you use? Dave sent me prints for the both 270-308 and the Improved. One specs a .310" neck, the other a .308". Mine has a .306".  What did you go with?

Bill
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BobT
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« Reply #11 on: November 16, 2009, 12:47:08 PM »
Bill,

My barrel was already finished when I got it from Adam (Cowboyarcher) it has a .313 neck. I have no idea who did the work but it is a first class job as far as chamber and crown. I would like to get a reamer with a little smaller neck and probably will eventually. My loaded case necks from reformed Winchester 7mm/08 cases only mike .303 but accuracy so far has been pleasing. I am going to try to find some .358 Winchester brass and see if I can come up with some thicker case necks. I only have 27 rounds through the barrel so far. I fire formed twenty cases and loaded 15 of them with the IMR 4350 load. I fired 2 for sighters/scope adjustment and 2 at the deer. The fire forming loads were grouping very well, all under .5 with the best one going .238 ctc. IIRC. I'm spread pretty thin time wise right now but I intend to get serious and see just what this thing will do!

Bob  
« Last Edit: November 17, 2009, 09:33:53 AM by BobT » Logged
It's better to shoot for the moon and hit the fencepost than to shoot for the fencepost and hit the ground!
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