Supersonic Whisper loads in your AR? Lend some advice!

[abyssdncr]

Hey folks,

I wanted to start a thread here to discuss whisper loads for your AR's.

I've got a M1S 16" and am finding some discrepancies in posted load data and real world results. Specifically, I'm developing my deer hunting load for 125 gr. BT.

I'm forming brass from Win. .223 Rem on Hornady dies and using H110 powder. SSK's site seems to be showing loads of 20.5 gr to 22 gr, but they're listing necked up .221 FB brass. I've seen similar data for the .223 brass as well though (I think it was on Feisty Rooster's page). Using Win. small rifle primers, I'm observing over pressure signs at 19 gr of H110 and nasty the-primer-has-become-one-with-the-brass signs at 19.5 gr. (Coincidentally, 19.5 gr. load with the 125 Nosler BT absolutely shredded a spike buck last week-double lung and heart shot. Didn't make it 10 ft.! :D ) 18.5 gr H110 + Win. .223 brass + Win. primers look good with both 125 gr. BT and 130 gr. Sierra SP.

I was reading elsewhere that the Rem primers are more durable and that's what most load data is listing as the primer, Rem 7 1/2. I don't have my chrony yet, (Merry Christmas to me!) so I don't know what velocities I'm getting with these loads. However, it's imperative for me to be able to get at least 2300 fps to maintain the necessary velocity for optimal expansion on the ballistic tip out to 300 yds.

That said, I'm not a huge fan of the H110. Would someone be kind enough to share their experiences with H4227?

I'd appreciate some feedback from other whisper owners...

Thanks,
8)