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Old 07-08-2017, 04:47 PM
hammer 1 hammer 1 is offline
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Default 41 mag 2400 results

I have been wanting to develop a load for my 41 mag model 57, AA9 has for some reason become spotty in my area, it is sooty and I have not really liked the performance. My LGS had a nice shipment of 2400 so, stocked up a bit. Did a bit of a ladder test, and have have settled on 17.5 grs. Over the chronograph, my load of 17.5 , under a 215 gr SWCBB acme bullet, starline brass and fed primer, did an average of 1340 fps. About perfect, to my way of thinking, the weird part, was 18 grs, and then 18.5 grs, gave chronograph reading, under the 1340, in fact, one cartridge of 18.5 grs, gave a velocity of 1302. Has anyone had this happen?
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Old 07-08-2017, 10:25 PM
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It happens when a powder reaches its best returns and the extra powder.....
either it is still burning as it goes out the barrel or it is not
correct for the bullet weight used.

I have had Unique beat out Blue Dot in a 9mm with a 147gr bullet, due to the case volume set ups.

The perfect load is the powder burning 100% inside the barrel before the bullet leaves it.
Most people have no clue on how short a time measurement this is. Milliseconds !!

Have fun.
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Old 07-08-2017, 10:30 PM
oysterer oysterer is offline
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What's kind of groups do you get. I just made up some 41 specials. 12.5 gr 2400 and 210 gr Sierra jsp. I have not tried them but that was a taffin recipe.
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Old 07-08-2017, 10:39 PM
38SPL HV 38SPL HV is offline
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Haven't seen that with my experience with 2400 and 215 gr SWC cast in my 41 Magnums. It was my favorite caliber for years and 2400 was my go to powder for Magnum 215 gr cast loads in 1,200 - 1,275 fps range. Unique and Universal for mid range loads in 950 fps - 1,000 fps range. I no longer own a 41 Magnun, my choice but recommend the 41 Magnum over 44 Magnum, but that's just me.
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Old 07-08-2017, 11:56 PM
Steve C Steve C is offline
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I load Hornady 210gr XTP JHP's on top of 17.5grs of 2400. The load chrono'd at 1,413 fps average for 6 shot string from my S&W 57 with 6" barrel using WW case and primer.

I haven't tried to push 215gr LSWC's faster than what 9.5grs of Unique will at 1,157 fps from my 4" Mountain Pistol. Have not ran this load from the 6" over the chrono.
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Old 07-09-2017, 02:13 AM
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Quote:
Originally Posted by hammer 1 View Post
My LGS had a nice shipment of 2400... Over the chronograph, my load of 17.5 , under a 215 gr SWCBB acme bullet, starline brass and fed primer, did an average of 1340 fps.
Lyman Cast Handbook #4 lists 17.1gr/2400 as max. with a 210gr RCBS L-SWC. 1286fps from a 4" bbl @ 40K CUP. This may account for your drop-off in velocity with higher charges.

Also, were the higher charges starting to leave leading?

.
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Old 07-09-2017, 11:32 AM
cowboy4evr cowboy4evr is offline
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I don't care for the residue on the outside of the case using ACC#9 . I have found Acc 4100 / Ramshot Enforcer (the same) to work well when I couldn't find 2400 and the case was cleaner . They are just slightly slower in burn rate than 2400 but faster than W296/ H110 .
Then there's my " go to powder " for many years in the 41 when I wanted upper end velocity and top accuracy , IMR 4227 using a " full " magnum primer . I only shoot 2 cast bullet designs , the actual " Keith " 220 swc , HG 258 and Veral Smiths LBT LFN 210 . I cast them myself .
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Old 07-09-2017, 08:03 PM
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I have not had any issue with leading, never had. Gonna stick with the 17,5 load, primers looked good, was much cleaner burning than aa9. The Lyman third edition cast bullet handbook, shows all the way up to 18.8 of 2400.
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Old Today, 12:12 AM
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The 41 mag was developed using 2400.
Not sure I would use Elmer's top load but you can't go wrong using 2400.
I prefer it to any ball powder.
(I am currently reading Elmer's columns from the 70's in "Gun Notes Vol. 2")

I have had velocity reversals a couple of times developing .445 loads out in the blue where there is absolutely no information.
IMHO it is a dead sure sign to back off.
My best groups have been the ones a grain or 2 less than right before the reversal.
Have not seen it in a revolver probably because I rarely go top end in wheelgun.
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