Snyd
.375 Atomic
The Last Frontier
Posts: 2,387
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Post by Snyd on Mar 4, 2020 11:42:33 GMT -5
Light: Unique Heavy Ruger Only: LilGun
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Ramar
.30 Stingray
Posts: 399
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Post by Ramar on Mar 4, 2020 14:45:41 GMT -5
Prescut, Hope you pass by this thread again. When you say N340, "...downloads beautifully without spikes or peaks..." do you mean consistent chronograph readings or ?? Thanks! Hey Ramar, Some powders have a straight-line linear pressure increase or decrease, as you increase/decrease powder weights. A spike is when a small amount of weight change can create sudden spike in pressure; if you were graphing your velocity, you would not see a straight line, but a spike one one spot. Certainly one way of seeing it is with the chrono (pressure changes by watching velocity). You can see the pressure increasing "steadily" and then suddenly show a bigger increase; in some load data tables where pressure is shown. Lots of folks on here know a lot more on the topic than me. Maybe they will be along. One of the reasons I like N340 is that it burns consistent and clean at low weights and high weights. I can extrapolate what my velocity should be at any weight when I know the velocity difference at 2 weights. I love H110 but I don't download it; I stay closer to max and it does great. Prescut Thank you, Prescut! I really appreciate that you took the time to explain that. It's new info for me. N340 sounds like it will be interesting to try.
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diddle
.30 Stingray
Posts: 467
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Post by diddle on Mar 5, 2020 14:56:16 GMT -5
Unique, 4227 and H110 for me ... with each load boldly marked on its box.
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bouddha
.30 Stingray
You can drown in hamster piss, but it might take a while.
Posts: 162
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Post by bouddha on Mar 6, 2020 18:48:13 GMT -5
Any recipe for N-340 in a .41 mag load? Loaded up 40 rounds with 10gr 340 for my .45 Colt, 10 rounds with 11gr which should still be under 1200 fps with the 255 SWC.
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Post by oddshooter on Mar 7, 2020 12:52:06 GMT -5
Any recipe for N-340 in a .41 mag load? Loaded up 40 rounds with 10gr 340 for my .45 Colt, 10 rounds with 11gr which should still be under 1200 fps with the 255 SWC. I refuse to claim any responsibility for anyone reading this post. IT IS DANGEROUS ! Hey bouddha, Using Vihtavouri is tougher because of the lack of data. pdf.textfiles.com/manuals/FIREARMS/vihtavouri.pdfThis older link above has a reference on page 52 to N350 in the 41 mag using 170gr JHC or a 210gr HP/XTP. N350 being close to N340, but N350 being a little slower on the burn rate chart. They show N350 using the 210gr with 11.8gr getting 1339fps. They show N350 using the 210gr with 10.4gr getting 1221fps. I don't know how you feel about interpreting and then extrapolating load data, but I have only tried it with the Vihtavouri powders because I have found them stable and very linear with their weight changes. I do NOT recommend this for anyone without many years of experience doing many load data tests. With the wrong powder or the wrong extrapolation, it's just not safe. I hesitate to go further, but I will call note to the next table on that page for the 44 special. It has both N340 and N350. Note that N350 uses from .8gr to 1.1gr MORE powder to get very close to the same velocity as N340. The same appears to hold true for other calibers but the "measurable difference" changes between the two powders because of the different caliber and bullet used. Check them out. I think/hope you see where I'm heading. Perhaps?, maybe?, about 1.0 grain less of N340 might get close to the same velocity in 41 mag as well. If you have to use N350 load data, you must use LESS powder for the N340. And of course you probably don't have the exact same bullet as the load tables either. That's a different interpretation and extrapolation as well. Call Vihtavouri when in doubt is the best advice. Good luck and Please stay safe. Prescut
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bouddha
.30 Stingray
You can drown in hamster piss, but it might take a while.
Posts: 162
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Post by bouddha on Mar 7, 2020 19:45:17 GMT -5
Very much appreciate not only your concern but your effort and attention. I was not clear enough about where I was going and what I had done already. The ONLY loads I have done to date are for my .45 Colt, and the 1200fps was not something I was trying to accomplish, rather an arbitrary personal limit for my every day shooting. Knowing that N-340 has a linear pressure/volume growth led me to wonder about its use in the .41, for which I had found NO load information. Further, I only load 210 gr slugs in the .41 magnum, so crisis averted.
I have loaded for (as memory serves) 21 different calibers over the last thirty years, and the only time I came close to crowding the upper limits on any of those was by accident; I was loading for a .45 Colt Vaquero and settled on 7.1gr W231 powder for the 250 XTP. After loading half a dozen rounds, I had to get up to answer the door and bumped my table. Returning to my work I remembered to check my RCBS scale and saw it still read 7.1 on the short side of the balance so I loaded the other forty some rounds, put the powder away and went about the rest of my business. As I was drifting off to sleep that night it occurred to me that something was amiss. Getting up and going to check the scale again to reassure myself, I noticed that the balance weight on the LONG side of the beam had been nudged over a full 10 grains, meaning I had loaded most of those rounds to 17.1 grains of W-231. I would very likely be typing this with my toes had I not had that little subconscious epiphany!
Long story short, not being comfortable enough with what little info I had on N-340 in the .41 mag, I went with HS6 again. I will revisit the situation after my range time with the .45 Colt loads. Thanks again.
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Post by rleprechaun on Mar 8, 2020 19:49:33 GMT -5
Unique, Blue Dot, H-110
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Post by nvcaller on Mar 10, 2020 22:01:18 GMT -5
I have done a lot of powder testing it depends on bullet weight. Hs6 for most picking to serious loads. For hunting I like w296, h110. Don't worry about es and sd till you shoot over 150yrds . Just have fun.
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Post by wildcatter on Mar 19, 2020 23:05:44 GMT -5
I have always relied on 231/hp38 for lighter bullets 250 and under, 2400 for medium bullets 270 to 300 grain hot loads, HS-6 for medium loads, but if I'm pushing the Ruger only loads H-110 300 to 340 grain, always pushing lead!
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Post by bradshaw on Mar 20, 2020 9:56:13 GMT -5
Any recipe for N-340 in a .41 mag load? Loaded up 40 rounds with 10gr 340 for my .45 Colt, 10 rounds with 11gr which should still be under 1200 fps with the 255 SWC. ***** buddha.... look up Vihtavuori Reloading Data. N340 is listed for .44 Mag, but not for .41 Mag. Read data for N350 and N340 under ,44 Mag. Compare N350 charges between .41 & .44 Mag. Extrapolate for starting load. David Bradshaw
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bouddha
.30 Stingray
You can drown in hamster piss, but it might take a while.
Posts: 162
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Post by bouddha on Mar 20, 2020 10:15:24 GMT -5
Thanks, David. Going to start at 9gr and work up.
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Post by oddshooter on Mar 20, 2020 10:37:55 GMT -5
bouddha,
I think 9gr is the perfect starting load for the N340 in the 41mag. I'm guessing right at 1150fps to 1200fps.
Prescut
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bouddha
.30 Stingray
You can drown in hamster piss, but it might take a while.
Posts: 162
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Post by bouddha on Mar 20, 2020 12:03:41 GMT -5
I've had the intention of firelapping my .41 mag Bisley for a few weeks, but I need to empty a few cases to use in that process. Got the kit in the mail about ten days ago...and there we are. If I can tighten those groups to an inch or so at 36 feet, I'm gonna be good. If not, gonna let Mr. Powers octagonal another barrel to match my .45. Probably going to do that anyway if I can liquidate some toys.
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Post by dobegrant on Mar 28, 2020 19:33:17 GMT -5
Unique and 2400 , sometimes 231
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Post by dougader on Mar 31, 2020 22:58:38 GMT -5
231, Blue Dot, W296
I have a pound of Longshot here to try...
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