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Post by rob67 on Jan 6, 2015 19:08:19 GMT -5
How about H4198 as the booster in duplex loads? I would also like to see more H4831 in a single powder, but I know slow and steady, we'll get there.. I agree with 4198 as a booster. I tried 4895/4350 with a 250g barnes ttsx and showed great potential accuracy wise. But with rain and people showing up had to stop. By the way a boat tail Barnes will flat out shoot in these .375's Thanks for the help TG |
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Post by TGinPA on Jan 7, 2015 16:25:11 GMT -5
Shown below are 2 traces of duplex loads using a H4198/H4831 combo in a .375cal bbl: The goal was to achieve ~2700fps with a full formed .375cal 270gr Hornady sp-rp bullet with the peak pressures not to exceed 50kpsi. The first attempt (H4198/H4831sc 10/80gr) came up a bit short resulting in 2660fps@~47.5kpsi peak pressure with the trace, suggesting possible incomplete powder consumption. Adding 1gr more H4198 and 2gr H4831 to the duplex powder load resulted in 2742fps @~52.7kpsi peak pressure. Though the peak pressure of this 2nd load was a bit high, dropping H4831 back 1.4gr would get close to the desired goals for both peak pressure and velocity (at least in this barrel). The loads shown in the traces below seemed safe in this barrel under conditions present at the time of the test, but may not be under other conditions. TG 36J) K375 H4198/H4831sc 10/80gr 270Hornady sp Full form#4.7 nowad 1/7/15  37J) K375 h4198/h4831sc 11/82gr 270Hornady sp Full form veg 1/7/15  |
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Post by fishhawk on Jan 7, 2015 17:08:38 GMT -5
Now we're talking! Ralph, you are a bit nuts if your shooting outside in this weather! My next guess 10/84 or 9/85-86 of the same powders, and see what happens?
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Post by jims on Jan 7, 2015 19:22:49 GMT -5
3 grains of powder bumped pressure up about 5K. Again glad you can provide this service to all of us. Apparently no ignition troubles in your cold weather either.
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Post by deadeye on Jan 7, 2015 19:51:25 GMT -5
Now we're talking! Ralph, you are a bit nuts if your shooting outside in this weather! My next guess 10/84 or 9/85-86 of the same powders, and see what happens? here 6.5 degrees//bet Earnhardt thinks that is a blessing!  |
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Post by Deleted on Jan 7, 2015 20:11:22 GMT -5
Now we're talking! Ralph, you are a bit nuts if your shooting outside in this weather! My next guess 10/84 or 9/85-86 of the same powders, and see what happens? here 6.5 degrees//bet Earnhardt thinks that is a blessing! -1° here Zen's been as low as -49° just to busy to get out to shoot. I might shoot Friday but I need to make sure I cut another cord or two of wood first. Already been threw 2 cords. |
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Post by Deleted on Jan 7, 2015 21:27:35 GMT -5
Looking good, keep up the good work. Much appreciated.
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Post by TGinPA on Jan 9, 2015 12:38:51 GMT -5
That’s a start. If there are no objections, future .375cal traces will be posted in the Load Info archive. The load(s) shown in the traces below seemed safe in this barrel under conditions present at the time of the test, but may not be under other conditions. TG 38J) K375 I4064 70gr 232gr Vulkan 9.3mm nurl veg wad 1/8/15  39J) K375 I4064 75gr 232gr Vulkan 9.3mm nurl veg wad 1/9/15  40J) K375 RL 1575gr 232gr Vulkan 9.3mm nurl veg wad 1/9/15  |
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Post by jims on Jan 9, 2015 13:58:25 GMT -5
That would make it convenient to go to and review. I have to start also writing a few of these down. Even more so when some accuracy testing is able to be determined. If you get a great load and excellent accuracy that barrel could get lost in the return mail.  For those that needed a starting point you are getting them a solid base. |
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Post by rob67 on Jan 9, 2015 14:55:32 GMT -5
The reloader 15 looks very impressive.
Will these traces be on there own or with the other traces?
Thanks for your work.
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Post by fishhawk on Jan 14, 2015 20:08:36 GMT -5
TG, is it just me or is the smaller caliber more sensitive to small changes in powder weight than the .45's? It looks like if you add a couple grains, the pressure comes up quicker than the bigger bores.
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Post by Deleted on Jan 14, 2015 20:24:15 GMT -5
appears that way to me as well, been watching this with great interest. might be a .375 barrel in my future....
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Post by jims on Jan 14, 2015 22:42:03 GMT -5
I can't answer for TG but I believe that is clearly the case.
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Post by TGinPA on Jan 15, 2015 10:37:58 GMT -5
Agree with Jims, Hillbill and Fishhawk that when comparing .375cal to .45cal barrels, in the smaller caliber, from the numbers collected so far, there is a suggestion that relatively small changes in powder charge wgt are indeed associated with relatively larger changes in peak pressure generation, at least in conditions present when I’m tracing. IMO, though this is pretty much what we expected to see, and everything collected to date is in support, comparisons with reloading handbook data (if I read it correctly) are not clearly in support and not enough data is yet available from my numbers to say for sure .
TG
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Post by Savage Shooter on Jan 15, 2015 15:18:50 GMT -5
Wonder if nosler partitions would work?? ......... 286gr bullet in the 9.3 has BC like .480
RL15 fits it really good.
Nosler 7th edition says up to 66grain at 2600fps in 9.3x64 25" barrel so charge could be higher in .375 barrel. Actually is listed as powder of choice in the 9.3x64 barrel with 286gr partition bullet.
I would think you easily boost the 286 grain bullet with RL15 staying with 65-70 grain total up to at least that speed. Would help keep powder column length down.
No SAAMI pressure standard for the 9.3x64 but ANSI and Euro CIP lists it at 64K (in 9.3 barrel but will come down in .375 barrel) so should have been the max standard used by Nosler during testing the 286gr in 9.3 barrel. But as we have seen in the past when you take away engraving process this changes.
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Post by jims on Jan 15, 2015 22:06:09 GMT -5
I think TG may have that bullet in stock. Perhaps we will hear.
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Post by Savage Shooter on Jan 16, 2015 9:53:47 GMT -5
I think TG may have that bullet in stock. Perhaps we will hear. If not maybe someone would send him some. It is the ultimate bullet IMO for this use. Good BC. Soft front nose cone for wide range of velocity expansion. Stay together during extreme impacts (close shots). May gain some obturation in rear to help with barrel fit. I like it a lot better than the big cup & core bullets at high speeds, won't have the gaping wound channels like bomb went off! |
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Post by deadeye on Jan 16, 2015 10:15:48 GMT -5
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Post by Savage Shooter on Jan 16, 2015 10:19:11 GMT -5
Yep that's a big part of it too! LOL! That big bullet should be easy. Woulda thot you have it now. We can certainly back to work on it if you need. |
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Post by Dave W on Jan 17, 2015 8:04:32 GMT -5
The 3031 and 235 TSX looks pretty good, shortened the rise to peak too.
Keep them coming, and a big thank you!!!!
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Post by TGinPA on Jan 17, 2015 12:21:24 GMT -5
RE .375cal bbl, RL15 and 286gr 9.3mm Nosler Partition: (as SS predicted). NB: A plug with a 7/32in flame channel may be necessary with this load to prevent primer bulging. The load traced below seemed safe in this barrel under conditions present at the time but may not be under other conditions. TG 22X) K375 RL15 68gr 286gr 9.3mm nos partition nurl veg 1/17/15  |
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Post by Deleted on Jan 17, 2015 13:46:27 GMT -5
Looking good. Keep up the great work and thank you for your efforts.
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Post by Deleted on Jan 24, 2015 17:44:12 GMT -5
Bump
TG, what else do you have in mind testing on the .375?
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Post by TGinPA on Jan 24, 2015 20:58:12 GMT -5
To get a feel for what to expect with pressure/velocities with .375cal sml, what I hope to do first is to trace single powder loads over the 225-300gr bullet range using powders over a fairly large range of burn rates, keeping pressures at <50kpsi if possible. That will give those who have been thinking about this caliber a lot longer than I have enough info to give me feedback as to what to do next and head my tracing efforts in the right direction.
Tracing takes time and I do it when I have ample time available. Right now, I don’t, but should be back online in a few weeks.
TG
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Post by jims on Jan 24, 2015 21:00:47 GMT -5
We know the time it takes and all appreciate your efforts.
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Post by Dave W on Mar 13, 2015 12:29:17 GMT -5
Noticed you have moved to smaller bushings in the recent traces, any specific reason?
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Post by TGinPA on Mar 13, 2015 16:14:16 GMT -5
DaveW. I could have posted this earlier. But, given the recent plug debate, thought it best not to swim in (presumably) bloody. shark infested waters! Now I guess I WILL have to get wet, hopefully while remaining intact. It is what I am doing, and but just one approach, mainly based on my goals of trying to maximize performance while maintaining powder ignition consistency with slow powders and heavy bullets in an acceptable pressure range for this caliber, given the Savage bushing plug system available to me at present. With recent .375cal duplex traces, using slower powders with heavier bullets, I saw some leaking and/or bulging primers in some of the loads traced with .028-.030 bushings, even with a 7/32in.flame channel diameter. In a few, IMO, the velocities of loads showing the worst primer damage were also sometimes lower than expected, maybe due to pressure loss from blowback? Using the .021in. bushing (thank you Earnhardt) eliminated the bushing damage problem without significantly affecting (maybe even improving?) velocity for the loads and bullets I was tracing. But, for such a small flame orifice size and slow burning powders in the H1000range, a booster may well be always necessary for powder ignition consistency. Only time will tell if this approach compares favorably with results seen with other newer plugs at similar pressure levels. Shown below is one attempt to show this, comparing effect of bushing orifice size on load performance, using a hefty (at least for me) .375cal duplex load containing BlueDot for a booster with H1000 as the main comparing the effect of bushing orifice size on pressure/velocity. Both loads were traced using the same bushing plug. The first load (T1) was traced using a bushing with a bushing orifice~.029in (flame channel diam=7/32in.). The second load (T2) was traced using a bushing with an orifice~.021in. (flame channel diam=7/32in.) Below the trace comparisons are photos of the 2 primers (T1 on the right in both pictures). I remain puzzled as to why I am seeing these primer changes while others presumed to be shooting at similar levels with larger orifice bushings are not?? 42X) K375 BlueDot/H1000 5/95gr 300gr .375tsx Full form wool/fiber wads 3/5/15 2 bushing comparison  The loads traced here seemed safe in conditions present at the time the traces were made in this barrel. They may not be under any other conditions in other barrels. Loads were traced using a 28in. Krieger bbl generously loaned to me by jims. FWIW, all the .375cal traces performed here to date are based on the assumption that a load containing I4064 60gr propelling a 9.3mm 270gr Speer hc bullet will develop a peak pressure of 45+1kpsi at 65degF. in this barrel. That is the load presently used for trace system calibration. TG   |
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Post by Deleted on Mar 13, 2015 17:14:15 GMT -5
Darn savage!! Thanks TG
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Post by Dave W on Mar 14, 2015 10:44:20 GMT -5
I thought that may be the reason TG, but figured I should go to the source. Thanks!
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Post by fishhawk on Apr 6, 2015 11:47:00 GMT -5
Lately, Ralph has had issues with primer damage as he ramps up the pressures and uses slower powders. He tried a .021 bushing he got from Earnhardt, but it was the old Tungsten carbide which would wear with slow powders and higher pressures in the smaller calibers. It worked well until it burned to .025 (this is with a 7/32" flame channel). He now has a Pure Tungsten .021 bushing, and a plug that has a .3" flame channel that I had made for Earnhardt. Ralph now has two different ways to go for protecting the primer. Thanks Earnhardt for to donation to the cause!
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