280 Rem -- Good Day at the Range

[M7025-06]

...well this morning actually.

Ran 3 more ladder tests this morning with the 280. The first set was with H-4831sc pushing a 140 gr. AB which showed zero promise. My 12 gauge patterns better. I'm officially done with this powder (at least for the 280).

**DISCLAIMER: this load is over max per Nosler #7...work up to carefully**
The 2nd set was IMR-4831 (55.5 gr. - 57.9 gr.) behind a 140 gr AB, worked up in 0.3 gr. increments. No pressure signs showed up until 57.9 gr (55K psi per QL when the velocities are matched up) where the bolt lift was a tad stiff, so I'm calling 57.6 gr as max for this rifle. Looks like I've got a node between 57.0 & 57.6 gr. (F, G, & H). The 3 measured 2.161'' @ 300 meters....velocity is in the mid-high 2900's. I'll double check this charge range next time out.

The 3rd set was H-H100v (52.0 - 55.5 gr) pushing a 140 gr AB, worked up in 0.5 gr increments. I bought a pound of this powder on a whim and it looks like I might have a winner. I pulled some load data off of IMR's website (50-54C gr & 140 gr Partition / not sure how IMR is getting a compressed load at 54 gr...I can hear powder rattling around the case even at 55.5 gr.) QL is telling me 55 gr is running about 62K psi when I match up the velocities, so I'm calling this max for this rifle even though I didn't see any pressure signs. Looks like I've got a node at 53-54 gr (C, D, & E), with velocities from 2900-2970 fps, that measured 1.049'' @ 300 meters.

I ended up grabbing a pound of IMR-4451, when I bought the H100v, that's next up for testing with some 140 gr AB's and 139 Hornady IL-BT's.

 

[Whitesheep]

Nice shooting M7025-06,

What rifle were these shots fired from and is this a straight .280 Rem or AI?

I am not familiar with H-H100v but that is a killer almost 0.33 moa group isn't it?

140 AB's have done well for me, but I can't find anymore and only have 5 left. I do have some 140 ABLR's back ordered, but don't expect them for another month so I am working with 140 BT's that are running less than 0.600 moa.

 

[Dwh7271]

That H100V from 53-54 looks promising. You may even tighten it to 53.5-54. Speeds aren't bad at all either.
Cool ladders.

 

[M7025-06]

Thanks.

Straight 280 with a 23" Bartlein barrel. The h100V definitely did better than I expected.

I've thought about trying the 140 gr BT's...just haven't done it yet.


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[DrMike]

Your results mirror some I've had in the past. H100V has proven to be a fine powder for me with the 140 grain Partition and with the 150 grain Partition. I allowed myself to be diverted with the ABLR, but the data generated with the H100V have been excellent.

 

[M7025-06]

Your results mirror some I've had in the past. H100V has proven to be a fine powder for me with the 140 grain Partition and with the 150 grain Partition. I allowed myself to be diverted with the ABLR, but the data generated with the H100V have been excellent.

Have you noticed any major issues as far as temp sensitivity goes?



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[DrMike]

I have never had a problem of temperature sensitivity with H100V. Mind you, it seldom gets above 80 F here (though winter temperatures can drop to -45 F or lower (I don't hunt when it drops much below -30 F)). I still have a couple of boxes of 140 grain Partitions charged with H100V loaded and ready to go with the older of my .280s. They just may be used this Fall for game.

 

[M7025-06]

That's what I wanted to know...thanks for the info.

Even though I do most of my load testing in the spring and summer... I shoot in the early mornings so I very rarely shoot when it's over 80.


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