270 winchester and IMR7828


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Tony k
July 11, 2014, 09:47 AM
I'm working up some new 270 loads with 130 grain sierra game king. I've been staring at this pound of IMR 7828 for about a year now, and I figured I'd try it out.

I've looked at Lyman 49th, Speer 14th, and the Hodgdon/IMR/Winchester website.

Here''s how I plan to test loads.

Rifle:Savage model 111
COAL: 3.310" (about .025" off the lands)
Case: FC 3X fired
Primer:Rem Magnum LR
Test Loads (grains):
54.2
55.4
56
56.6
57.2
57.8
58.4
59
59.6
60.2

Any thoughts, experience, or warnings for this plan?

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bmnloader
July 11, 2014, 10:15 AM
I'm running 56.5 grains of 7828 under Nosler BTBT's and it shoots great in a Rem 700 Sendero. For long range I was shooting 150 grain Noslers with a minor bump in powder. I believe you'll find the sweet spot with what you have listed.

Tony k
July 11, 2014, 11:27 AM
Thanks bmn loader.

I'm also using as lightly different work up technique based on the reloading tips on the hodgdon website.

To start, I'm only testing TWO rounds at each increment. In the past I always did FIVE rounds. The idea is that two rounds should be enough to let you know when you are bumping up against max pressure, and it should generally show you where your nodes of accuracy. After the two round tests, I'll retest the best with 4 shot groups.

I just finished loading up the initial series. They seem slightly compressed at 57.8 and above.

gamestalker
July 11, 2014, 04:53 PM
Keep us updated on how this works for you. I've been looking at 7828 for use with .270 win lately also, so please get back to us.

GS

Skyshot
July 11, 2014, 08:04 PM
My buddy's Rem 700 is shooting well under an inch at 100 yards with 54.5 grns of IMR7828 using the 140 grn accubonds. You look like you're good to go. You may not need the mag primer.

Tony k
July 11, 2014, 09:04 PM
I was torn on which primers to use. 7827 is a slow powder. I figured if there was ever a powder in this 270 that would benefit from a mag primer, 7828 would be it.

Hopefully I'll have time to test them tomorrow.

Tony k
July 12, 2014, 10:12 PM
Ok. I did the two round preliminary tests and things look fairly good. Cases were a little sooty at the low end. No indications of excessive pressure at the high end even though it was 90 degrees in the shade when I was testing. Felt recoil was about average for a 270. One concern is that I think some of them had a little bit of muzzle flash (don't recall seeing that with other loads in this rifle). Here's how they grouped:

54.2 grains= .77" (sooty cases)
55.4= .37" (sooty cases)
56= 1.5" (Sooty cases)
56.6= 1.2"
57.2= .71"
57.8= .30"
58.4= 1.72"
59= .82"
59.6= 1.19"
60.2= 1"

Remember, those are two shot groups. I don't realistically expect to have 4 round groups below .5." I'll be satisfied with 1" groups. I'll be ecstatic if I get .75" groups.

Next I'll test the three best (55.4, 57.2, and 57.8) in four shot groups.

gamestalker
July 13, 2014, 02:04 AM
Looking pretty good up toward the higher charges, which is about what I would expect from a slow burner like that.

I would also think a little muzzle flash to be expected with a powder like that.

Thanks for the feed back, keep it coming.

GS

Tony k
July 18, 2014, 07:33 PM
retested 55.7, 57.2, and 57.8 using four shot groups. Acceptable, but nothing too exciting about the groups.

55.7= 1.6"
57.2= 1.1"
57.8= .90"

Tried to upload pics, but my connection is too slow

Tony k
July 18, 2014, 07:59 PM
57.8 grains. .92" group

gamestalker
July 19, 2014, 01:43 AM
IMR-7828 runs very well in the .270 and a few other cartridges also.

GS

scottishkat
July 19, 2014, 09:19 AM
I've been running VV N-560 in my Weatherby Accumark 24"bbl 60 grains 210M with 130's COAL doesn't seem to matter the last batch I shot was 3.350 and shot 5 in .446". Been meaning to try H1000. I had some good luck with 7828 in my 260 rem and my experience has indicated they like the same powders H4831 was a bit better.

Good luck and shoot straight.

Bob

WestKentucky
July 19, 2014, 09:35 AM
I bought a keg of 4350 years ago. Otherwise I would be on 7828 like a dog on a 3 legged cat. How well does it meter through a powder drop? How well does it go through a dribbler?

Tony k
July 19, 2014, 01:20 PM
WestKentucky, I was throwing it through an rcbs powder thrower to get close, then finishing off with a lee powder trickler.

It's a big stick powder, but it seems to flow better than I expected. Some cutting of grains.

I like it in the trickler because the grains are so big that it's easy to do one "stick" at time. It's kinda like watching a fat piece of pencil lead fall. It was a little crunchy and "catchy" in the trickler, but nothing that bad.

I haven't checked how consistent the throws are, but my hunch is that I'll always want to weigh each individual load because of the grain cutting. I'd like to be wrong about that. I guess I could try 7828ssc for smoother metering...

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