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Old 11-11-2012, 07:58   #1
OhioGlockMan
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Please Recommend Unique 180 gr load

I gotta say I'm really liking unique powder more and more. I discovered it makes very very economical loads & powerful in the 10mm and many other cartridges. It has virtually zero muzzle flash, just a dull orange little ball, which so many people strive for. I have found the perfect 155 grain load, 7.5 gr for high 1200's (out of my 6 inch bbl) FPS, and the perfect 357 magnum load for 125 grain pills, 9 grains does mid 1200's from 3 inch revolver and 1650 from my 16 inch carbine, and its sooo pleasent to shoot in the carbine while delivering 750 ft-lbs energy. Anyways I have not played with it in the 180 grain weight range yet. Through my research and development I created great HOT loads for the 180 gr range with power pistol and will always shoot them, now I want a good soft shooting load for the 180 grain range, soemthing thats about equivalent power level to the factory load Remington UMC 180, those do 1150, what charge weights am I lookin at folks? Based on manuals looks to me to be about 7 but Id just like to hear from people that have worked with unique and 180 gr slugs.

Just a side note, I was out shooting yesterday and as always tested more loads over chronograph and this time with my 357 mag carbine, anways I bought a can of 2400 cuz so many manuals and people online praise it as the perfect high velocity powder for magnum loads, well the velocities blew though. Under a 158 slug a max charge of 14.8 gr only clocked 1550 - 1600 FPS, this is from a 16 inch barrel. Whereas I could get 1800 FPS from 17 gr Winchester 296. Why does 2400 blow velocity wise?

Last edited by OhioGlockMan; 11-11-2012 at 07:59..
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Old 11-11-2012, 11:08   #2
dm1906
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7.0 gr. Unique is a good target load. I've done a bunch in the past. It is very economic, less than 1/2 the cost of the go-fast powders, round for round. Your 6" barrel should get you in the 1150-1175 FPS neighborhood. As always, work up to the charge from about 6.5 gr. I seat them at 1.250". You'll find the lighter loads will be a bit smoky, but that clears up as you get the case more full. You can also seat the bullet a bit deeper to close the case fill with lighter charges, but don't go below 1.235" if your bullet allows (start over, and work up to it, of course). CCI 300 or 350 were about equal, with no real noticeable difference in velocity, or feel (as expected).

In regards to your .357M rounds, you are comparing a MAX 296 charge with a moderate 2400 charge. 296 will have an advantage in the longer barrel, while the 2400 does better with shorter. Work up your 2400 loads, watch for pressure indicators, but you should be able to get within 50-100 FPS of the 296 in a 16" barrel. I use 20 and 24" rifles, but the results should be comparable. You can also improve consistency with both powders using small rifle primers, for carbine loads.
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Old 11-11-2012, 16:20   #3
OhioGlockMan
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thanks DM1906, where you think the charge should be to yield 1200 FPS from the 6 inch barrel? I'm basically trying to duplicate the performance from factory Remington UMC 180, they list it as 1150 from 5 inch barrel, I get 1200 from 6 incher. It's a great all purpose target factory loading.

Well that max for a 158 grainer in 357 and 2400 powder is now 14.8 or 14.9. Older manuals went higher, I think this has something to do with SAAMI downgrading the max PSI for the 357 down to 35,000 PSI for the small J frame snubbies, I think a strong revolver or carbine rifle shoudl be able to take 40,000 PSI BUT im just not comfortable going over book loads
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Old 11-11-2012, 23:00   #4
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I think you'll have to go above 7.0grs to get close to your velocity goal, probably more like 8.0grs. Be sure to check Alliant's free on-line load data for limits, pressures, and velocities.

It's interesting, as the wildcat the 10mm was based from (the 40G&A) was originally loaded with Unique and 180gr bullets...
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Old 11-11-2012, 23:00   #5
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I think you'll have to go above 7.0grs to get close to your velocity goal, probably more like 8.0grs. Be sure to check Alliant's free on-line load data for limits, pressures, and velocities.

It's interesting, as the wildcat the 10mm was based from (the 40G&A) was originally loaded with Unique and 180gr bullets...
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Old 11-12-2012, 13:07   #6
dm1906
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Quote:
Originally Posted by OhioGlockMan View Post
thanks DM1906, where you think the charge should be to yield 1200 FPS from the 6 inch barrel? I'm basically trying to duplicate the performance from factory Remington UMC 180, they list it as 1150 from 5 inch barrel, I get 1200 from 6 incher. It's a great all purpose target factory loading.
I've not done much above 7.0 grains, and didn't do any extensive tests. The 7.0 grain load very closely simulates the OTC rounds of the same bullet weight in the 4.6", 5.2", and 6.5" barrels, so I stopped there. Interesting, I used the Rem-UMC 180 gr. FMJ as a baseline, as it seemed about average of the lot (velocity and feel). I had a remainder of higher test loads, but just shot them up w/o data collection after verifying the 7.0 gr load. For target purposes, the difference between 1150 and 1200 FPS is only bigger bang and less successful brass collection. Unless you have a need for more bullet energy (game, steel targets, etc.), there's no discernible gain, and it increases the per round expense. My testing was with hard cast bullets. I don't use Unique for the "serious" bullets, such as for SD or hunting. Velocities with magnum powders can be as much as +200 FPS.

Quote:
Well that max for a 158 grainer in 357 and 2400 powder is now 14.8 or 14.9. Older manuals went higher, I think this has something to do with SAAMI downgrading the max PSI for the 357 down to 35,000 PSI for the small J frame snubbies, I think a strong revolver or carbine rifle shoudl be able to take 40,000 PSI BUT im just not comfortable going over book loads
I get that. I've worked up the loads using the "old" manuals, before the "new" manuals were in print. I don't have a J frame, or any "lightweight", so I'm no more concerned than I was 30 years ago. My loads are well enough short of full nukes, and I'm not inclined to fix what ain't broke. Alliant lists the pressures per charge/bullet the same, old to new, so if there were changes to the powder, it wasn't enough to warrant lab data updates. ANSI/SAAMI adjusted the max service pressure to 35K in 1993, but still list the original proof pressures of 47K-50.5k, with an E.V. of 9.2K. Why? I dunno. I think they just redefined the allowable % of proof to keep the lawyers happy. Also interesting is, the adjustment was only for transducer pressure data, as they left the maximum average CUP service pressure at 45K, with proof pressures of 60.5K to 65K, and an E.V. of 11.6K. As I said, I'm not close, so not worried.
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