300 blackout/whisper?

[FJ540]

I know Jon has/had a AR pistol in 300 whisper, and rumor has it Paul has a rifle in blackout, but there's very little mention of it in these parts (since we stopped talking about guns and all).

Anyone care to share pet loads or experiences with this cartridge?

I picked up the needed supplies for a 150gr SMK load to start with using H110, and will have a 16" DD barrel if Brown Santa delivers on time friday.

I'm probably going to start somewhere around 17gr, but with this weight bullet I should be clear up to around 20+gr and the sweet spot has been reported to be around 18.5 with stability all the way down to failure to cycle and even possibly squib around 11gr or so. Not looking for super fast, rather something that groups well and packs a thump at intermediate range. Deer and hogs are the main goal for the platform, but I won't be using SMK's on them. Kinda like a tacticool 30-30 that libtards hate.

I need to rig up a way to chop the brass next.

[rugersol]

http://www.300blktalk.com/forum/viewforum.php?f=141

... thought I heard of someone blowin' up their gun with H110 in .300 BLK ... FWIW!

[FJ540]

I hadn't seen that yet. Thanks!

I saw a bunch of pet loads threads which had next to nothing in them, and have been sifting through pages and pages of load development threads seeking some perspective. Neither of my books has the load data in them.

[JJ]

Just got two 10.5 barrels in yesterday for a couple pistola builds. I will be posting up a bit once I get the first one up and running.

First loads are going to be Lilgun and 110g Sierra HP's

[FJ540]

From what I've read, the 300MP loads run a little hotter (.5gr) than the comparable volume of H110. So if you have a recipe for 18gr of 300MP, you'd work up to 18.5 in H110 to get the same performance. The 300MP doesn't have flash suppressant, so it's probably a better BBQ powder, where I do everything I can to extinguish the flames on my hunting guns before I see them. Otherwise, people seem to think they're interchangeable in the 300blk.

I'll have to look up that kaboom. Thanks for the heads up on that one.

[rugersol]

From what I've read, the 300MP loads run a little hotter (.5gr) than the comparable volume of H110. So if you have a recipe for 18gr of 300MP, you'd work up to 18.5 in H110 to get the same performance.

I had a really tough time not gettin' 300MP ... I know it wasn't, but it appears to be developed specifically fer .300 BLK!

Bear in mind, no two powders compare, linearly! ... ya can't jest figure out the difference, and punch it into a calculator, to cipher a new load!

From what I read, 300MP is LOT more stable than H110 ... FWIW!

Based on the data, above ... I'd be purdy cautious 'bout 18.5gr H110 with a 150gr pill!

[FJ540]

I'm not dumb enough to cook up ammo based on inferred differences between powders. I was simply making a statement that the powders properties are close enough that it will get you in the ball park for starting ranges - no more. Each gun is different, and I have no idea if he's shooting chrome lined, shot out, hand lapped, or what when cooking up his charge.

What's really interesting in the threads I've read, is that the powder has a tendency of triggering the chrono on some of the charges these guys are doing sub sonic. So who knows if they're really measuring the bullet or the blasted crap? The guys who've done a lot of it figured out you need a blast shield to prevent bad readings.

What you said about the stability of the powder is true though. I'm not so thrilled with the temp sensitivity, and will likely switch to something else when this pound is gone. One group of guys was insistent that h110 was the de facto charge for heavy 300 loads, and then I moseyed over to another forum and found a lot of them like different powders.

[BC98]

From what I read, 300MP is LOT more stable than H110 ... FWIW!

Based on the data, above ... I'd be purdy cautious 'bout 18.5gr H110 with a 150gr pill!

I would agree with this. During some initial testing, I tried H110 behind a 150gr Fusion bullet and was only using 16.5gr. If my memory is correct, I did see some pressure signs (flattened primers and slight ejector swipe). Velocity was decent, though: about 1820 fps (5 shot average) out of a 9" barrel.

For 150gr and above, I have used A1680. I can't find some of my other, more recent, load data at the moment, but I want to say that I've also used Lil' Gun in 147gr M80 pulls with good success.

I would definitely agree with 300MP as being a good powder for lighter supersonic loads. I do have some data somewhere and I get slightly better velocity when comparing to a similar load loaded with H110, along with slightly less pressure signs. I'm also going to pick up a pound of Alliant 2400 at some point and work up some supersonic loads with 125gr TNT projectiles.

[FJ540]

I got some 120's and 220's today, along with some more powders, primers, and the new hornady cookbook which has a section dedicated to the cartridge now.

[OldmanFCSA]

Question:

Anyone interested in trying some 122-p124 grain cast bullets i n these cartridges?

I don't have one of these cartridges, but with these bullets, cast from wheelweights, I believe they would be a cheap alternative for basic blasting. I would not use for any defensive situations, but know they will handle veocities up to about 1500 feet per second without leading. Powder choice would be important.

If interested, contact me by PM please. Otherwise discuss here.

If anyone has pure "linotype", I have pushed these cast bulrts up to about 2600 FPS without leading the bore. These bullets will have no expansion characteristics.
I use these in 6mmRem & 243Win for fun or reduced fox loads/

[FJ540]

Pete was big on shooting straight lead in his 1911's.

I'm game for trying it sometime. I got the 220's to fart around with subsonics. If you've ever shot super colibri's you know they have a certain allure to them.

[FJ540]

Well, I got to the range today with a couple test loads (no way to chrono there, so I didn't get numbers) and had excellent results with 150gr moly SMK's over 17gr of H110, and some pressure signs (extractor swipe, flattened primers) with Nosler Ballistic Tips of the same weight and same charge. I was expecting the moly to keep the pressure down, but I was surprised the Nosler's had as much brass flow as they did. The Noslers were also substantially less accurate, even after a few rounds to work the moly out. I'm going to load another string of them up and drop it back .5gr and see if that helps reign them in.

I was mainly just doing a function check and sighting in the scope. Now that I know it goes bang, and will be somewhere on paper at 100yds I'll be more interested in cooking up some better loads.

Not the greatest pic, but here's a few of the cases.

[tenmilmag]

no range time for me today, guess i'll just cry myself to sleep now

[curly2k3]

I'll be keeping an eye on this thread, finally getting around to doing some reloading for my 300 blk within the next week or two

[LarryFlew]

making the brass

http://www.youtube.com/watch?v=LAGxcKI6XDc