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Thread: 270 Win load

  1. #1

    Default 270 Win load

    I loaded 270 win. using H450 for years and now it has been discontinued. I have been trying to get the same velocity with other powders as the h450 without much success. I have been loading 7 rounds at night or late evening and shooting them the next day. I loaded my 7 rounds using 140 gr. Interlocks and IMR 4831 powder at 53.5 grains. This load for the 7 rounds averaged 2815 fps. That night I increased the load to 53.8 grains with all else staying the same. Today I shot these 7 rounds and averaged 2810 fps. I increased my load by 3/10's of a grain and lost 5 fps. I can't figure this one out.

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    58gr of h4831 140gr hornady getting close to 3,000 fps

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    How is the accuracy of those new loads?

  4. #4

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    About 1 1/4 inch at 100 yards. Not near as good as I was getting with H450 powder. I am not satisfied with this load yet. I have 7 more rounds to shoot in a few minutes with 54.0 grains of IMR 4831. I will post the results of these loads later.

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    I have little experience reloading for the .270Win, but considering bullet selection I would guess that a little faster burning powder would be more suitable IMR 4831, perhaps IMR 4350 or IMR 4064 if there is load data to support those powders?

  6. #6

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    I shot this load a few minutes ago and got a average of 2847 FPS. It was 54.0 gr. of IMR 4831 and is listed as a max load in a couple of my references but not in one of my manuals. Accuracy was not bad at just barely over one inch. I will give this gun a goo cleaning and try this load again. This load showed no sign of over pressure.

    I have tried the IMR 4350 in this gun and started getting over pressure signs and bullet was about 100 FPS slower than this load. I have H4831 and IMR 4064 on hand. I will try these later.

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    Quote Originally Posted by Cast Iron View Post
    I loaded 270 win. using H450 for years and now it has been discontinued. I have been trying to get the same velocity with other powders as the h450 without much success. I have been loading 7 rounds at night or late evening and shooting them the next day. I loaded my 7 rounds using 140 gr. Interlocks and IMR 4831 powder at 53.5 grains. This load for the 7 rounds averaged 2815 fps. That night I increased the load to 53.8 grains with all else staying the same. Today I shot these 7 rounds and averaged 2810 fps. I increased my load by 3/10's of a grain and lost 5 fps. I can't figure this one out.
    Nuthin wrong yet. IMO.

    Either, an increase of .3 grain didn't effect the load enough to change the velocity average, of only the 7 rounds you tested. (Most Likely)

    OR, (Least Likely) you've reached the point of diminishing returns. (Increase in powder charge, with little or no increase in velocity, something that I've never encountered.)

    I think (H) 4831 is a good powder for the 270, and that you should increase your changes in powder charge to 1/2 grain at a time. Up to the point of where you get in the area of the expected top velocities for the data.

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    RL-22 should provide accuracy and velocity for your 140 grain load. I've used it for many years with lots of success stories. With a 140 grain C&C in an unfamiliar rifle I'll start load development at 56.0 grains of RL-22 and quit when velocity hits 2950-3000 fps.
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  9. #9

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    Got 7 rounds loaded with 56.0 gr. of RL-22. Will shoot these as soon as weather permits.

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    Been following this thread since I'm gearing up to start reloading for a Remington pump in .270, I'd like to shoot 130 accubonds. I walk into walmart to get momma a few things today and there is IMR4831 sitting on the shelf, figured it was a sign and picked up a pound. If I get these loaded up anytime soon i'll report back, otherwise thanks for the info!

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    Member Rod in Wasilla's Avatar
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    Wait... Walmart in Kenai sells powder?
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    And again h4831 56.0, 57.0, 58.0, 59.0, 60.0 it don't matter you will not get enough h4831 in that case to hurt anything. H4831 is the go to powder for the 270.

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    Quote Originally Posted by Rod in Wasilla View Post
    Wait... Walmart in Kenai sells powder?
    Uh, no...

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    Quote Originally Posted by 323 View Post
    And again h4831 56.0, 57.0, 58.0, 59.0, 60.0 it don't matter you will not get enough h4831 in that case to hurt anything. H4831 is the go to powder for the 270.
    Appreciate the confirmation!

  15. #15

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    323 I am not overlooking your posts. I will try the H4831 before I stop loading. I have used it with 130 gr. bullets in the 270 Win. and will try it with the 140 gr. also.

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    Cast Iron--I have a sealed 1# can of H450. I shoot H4831. PM me if you want to trade.
    Craig

  17. #17

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    I was a 270 buff for years and actually shot the barrel out of a Ruger 77. I never shot any 140 grainers, always Sierra 130 grainers on top of a full case of H4831. That would be around 60 grains. As I recall I had a real accurate load worked up with IMR4895 too. if your interested in that powder I'll do some digging.

  18. #18

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    I have a couple loads worked up and ready to shoot if I can get a chance to shoot them. Went out to the bench and got set up the other day with conograph and target and some migrant workers come in on the property beside me and went to work. Did not get to shoot that day. Would of probably been safe but was not going to take a chance. The loads I have now are with RL 22 and H4831. Will post the results when I get to shoot again.

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    Quote Originally Posted by 323 View Post
    And again h4831 56.0, 57.0, 58.0, 59.0, 60.0 it don't matter you will not get enough h4831 in that case to hurt anything. H4831 is the go to powder for the 270.
    H4831 59.5 gr 130's

  20. #20

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    I have two 270's. I have one set up for 130 grain bullets, the other one I want to shoot 140 grain Interlocks in. It shot very well with these until they discontinued H450 powder. I now need to find a replacement powder. I have shot lots of H4831 and will try it in this rifle also.

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