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Discussion Starter · #1 ·
I’m loading Magnus 230gr LRN over Hodgdon HS-6. OAL is 1.272”, mixed brass and CCI primers. I’m trying to develop a basic full-power load (850 fps).

The Hodgdon annual manual recommends 7.0gr to 8.0gr of HS-6 with OAL of 1.200”

- 7.0gr: 751 fps with 12,900 CUP
- 8.0gr: 859 fps with 16,600 CUP

The MidwayUSA LoadMAP lists loads for 230gr LRN from 6.9gr to 9.7gr of HS-6 with OAL of 1.275”

- 6.9gr: 679 fps with 10,200 PSI
- 8.5gr: 845 fps with 15,800 PSI
- 9.7gr: 969 fps with 19,900 PSI

I’m using a Lee Pro Auto disk. According to the LoadMAP, the possible loads would be:

- .53cc: 7.4gr of HS-6 (about 730 fps, about 12,000 PSI)
- .57cc: 8.0gr of HS-6 (about 790 fps, about 14,000 PSI)
- .61cc: 8.6gr of HS-6 (about 850 fps, about 16,200 PSI)

My problem: these loads are all within reason according to the LoadMAP, but the last one exceeds the maximum according to the Hodgdon’s manual. According to the LoadMAP, I should even be able to try the next disk: .66cc, which would be 9.3gr of HS-6 (927 fps, 18,500 PSI).

Why the discrepancy? Is it mainly that the Hodgdon manual is based on this load with an OAL of 1.200”, or is it because the Hodgdon manual is a bit conservative? Can you suggest from experience (or another reloading manual) whether or not the 8.6gr load of HS-6 would be ok?

Thank you!
 

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Just to add to the general hillarity, Lyman shows maximum of
8.6 gr HS6 + 225 gr LRN @ 1.272" = 921 fps & 16,600 CUP

I don't know what kind of RN Hodgdon was seating to 1.200", but that is bound to have an effect. On the other hand, the LoadMAPs always use the longest SAAMI spec OAL for the round if that seats the bullet in the brass at all. This leads to higher maximum charges. I have never loaded anything close to the high end of the LoadMAP.

I would load at the 8.0 grain level and not go higher unless I could chronograph them and know where I was headed with an increase to even the 8.6 shown in Lyman. I would not go to 9.3 grains at all but I have been called chicken.

Do you have a scale so you can load some with exact charges and know what your measure is really delivering or are you entirely depending on the Lee disk chart? If the latter, do NOT increase AT ALL. I started loading with Lee dippers and I was cautious about that. If it functioned the action that was good enough.
 

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Discussion Starter · #3 ·
Weighing charges from Lee disks

Jim,

Thanks for the comments. I'm a rookie reloader, and am trying to be very conservative about the pressure of my loads.

Good point about weighing charges. I have a Lee scale and RCBS check weights. I always weigh about a half-dozen loades from the Auto Disk before trusting it. With the .53cc and .57cc charges of HS-6, I found the Lee disk chart to be right on. If I work my way up to the .61cc charge, I'll make sure to weigh it carefully.

The .40cc disk drops 4.7gr - 4.8gr of Titegroup under my 200gr LSWC bullets, and this is a very nice load. So, if I can find a disk that gives me my "hardball" load, I'll probably be set for a long time. If not, I'll probably buy the adjustable charge bar for the auto disk measure so that I can fine tune loads by smaller increments.

Best.

Victor
Rome, GA
 
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