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  • JM7.7x58's Avatar
    08-08-2020, 01:31 PM
    Warning: thread drift! In an older worn Lyman 55, AA no.2 sometimes binds up the barrel. It is so small that it can either bind up measures, or leak from them. It’s a great powder and in a tight measure it can run wonderfully. Bullseye doesn’t...
    41 replies | 864 view(s)
  • JM7.7x58's Avatar
    08-08-2020, 11:47 AM
    30 LEE 311-165 RF 6 CAV WITH HANDLES PB $43 30 LEE 90364 2 CAV GC C309-120-R $23 I’ll take these two. Pm to follow. JM
    7 replies | 878 view(s)
  • JM7.7x58's Avatar
    08-07-2020, 11:14 PM
    If you ever get up to Bremerton, Navy Yard Metals sells lead to the public. I know that it is 3 hours away, so only an option if you were that far north for some other reason. If you can score either a whole or a partial sailboat keel, you would...
    10 replies | 564 view(s)
  • JM7.7x58's Avatar
    08-02-2020, 03:34 AM
    I buy Eastwood powders buy the pound thru Amazon, with free shipping. I like their clear-gloss. JM
    17 replies | 636 view(s)
  • JM7.7x58's Avatar
    08-01-2020, 12:09 AM
    I just ordered a brick of Remington small bench rest rifle primers from the Sportsman’s Warehouse web sight. I did the “Pay now and pick-up at the store later” option. They were $22.99 before tax, no shipping cost if you pick them up at the store....
    27 replies | 1954 view(s)
  • JM7.7x58's Avatar
    07-28-2020, 08:38 AM
    One of my Arisakas has a groove diameter of .3165”. By the time my 7th series Nagoya was made in 1943 the oversized bore was considered to be an acceptable tolerance. JM
    5 replies | 204 view(s)
  • JM7.7x58's Avatar
    07-27-2020, 12:49 AM
    Yep! Got to have some antimony. That’s why I said diminish and not to eliminate the good stuff. A little arsenic helps that quench also. Fit is King! Always has been. PC sure makes dealing with high pressure calibers that have tight chambers,...
    17 replies | 807 view(s)
  • JM7.7x58's Avatar
    07-26-2020, 12:33 PM
    Buried on page 7 of this PDF. Layne Simpson was running 5.9gr of Herco under a 175gr LSWC in ISPC competition. This gentleman did quite a bit of load testing and found that 6.1gr of Herco worked best for...
    23 replies | 799 view(s)
  • JM7.7x58's Avatar
    07-26-2020, 11:40 AM
    There is lots of old data for the old cartridges. Lyman Cast Handbook Third edition has a lot of Herco data. Not so much data for the “Newer” 40S&W. Here is a link to a Castpics powder/cartridge search. It lists a cast load on the bottom. ...
    23 replies | 799 view(s)
  • JM7.7x58's Avatar
    07-26-2020, 05:05 AM
    This is a good thread on Herco.! Multiply Unique Loads by 1.05 for a 5% increase. I’m running the Lee 401-175-tc in my .40 S&W over 6gr of Herco. Also...
    23 replies | 799 view(s)
  • JM7.7x58's Avatar
    07-25-2020, 12:14 PM
    I’ve no experience with .223 blanks. I have converted a bunch of 70’s era Lake City 30-06 blanks into 7.7x58mm. By cutting them down all of the crimp in the neck is removed. I would not have tried to reload these in the original 30-06 caliber....
    19 replies | 993 view(s)
  • JM7.7x58's Avatar
    07-25-2020, 10:46 AM
    I don’t think that it has removed the need for antimony in higher pressure rifle and pistol loads, but it has diminished the amount of antimony needed. Many people are powder coating and quenching at the end of the baking cycle. They are achieving...
    17 replies | 807 view(s)
  • JM7.7x58's Avatar
    07-23-2020, 08:22 PM
    It isn’t the same as the new powder. Buffalo Rifle is in fact the old 5744 that was made by Lovex, and resold by Accurate as 5744. This thread has a picture of an older can of 5744 that has both labels on it....
    4 replies | 375 view(s)
  • JM7.7x58's Avatar
    07-20-2020, 09:07 PM
    I have also found french pewter, marked "Étain". "Étain" is the French word for tin or pewter. JM
    9 replies | 486 view(s)
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About JM7.7x58

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About JM7.7x58
Long time listener, first time caller. I've been reading this forum for years. Very grateful for all the information I have gathered here over the years.
I was given an old Type 99 Arisaka over a decade ago by a family member. It had been disasembled back in the 70's and was missing half of it's screws. I got it put back together and am now getting ready to cast boolits for it and for 38 special/.357 mag.
Wood work, metal work, fishing, crabbing, freediving, surfing, boating, tool collecting
Welding Instructor


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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check