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  • Larry Gibson's Avatar
    Yesterday, 10:38 PM
    Put the target out. Put the firearm up on a bench rest using a solid rest of sand bags. Line up the sights on the center of the target paper and leave the firearm resting on the bags lined up. If the firearm is not zeroed then zero before putting...
    11 replies | 167 view(s)
  • Larry Gibson's Avatar
    Yesterday, 10:24 PM
    What weight bullet does your RCBS mould cast with your alloy? I've used H110 under cast 240 - 255 gr Keith type SWCs and the max load producing SAAMI MAPs is 23 - 25 gr. That's based on my own pressure testing with an Oehler M43 in a Contender...
    7 replies | 107 view(s)
  • Larry Gibson's Avatar
    Yesterday, 07:53 PM
    Yes, please define your concept of consistent?
    5 replies | 184 view(s)
  • Larry Gibson's Avatar
    Yesterday, 04:33 PM
    My older (60s) RCBS 45 ACP seater will not roll crimp 45 AR cases.
    13 replies | 377 view(s)
  • Larry Gibson's Avatar
    Yesterday, 03:10 PM
    12" twist?
    5 replies | 55 view(s)
  • Larry Gibson's Avatar
    09-23-2017, 06:16 PM
    Larry Gibson replied to a thread Bullet trouble in Cast Boolits
    Noe 316299 You might want to slug aor chamber cast the chamber neck to make sure a .316 bullet seated in the case will chamber.
    4 replies | 220 view(s)
  • Larry Gibson's Avatar
    09-23-2017, 01:02 PM
    The alloy and lube you're using for your BP loads will work just fine with smokeless powder if velocities remain the same.
    4 replies | 99 view(s)
  • Larry Gibson's Avatar
    09-21-2017, 07:09 PM
    No, 26-27 gr H4895 will be right at 100% load density. Velocity will be 1800-1900 fps.
    7 replies | 270 view(s)
  • Larry Gibson's Avatar
    09-21-2017, 11:07 AM
    Lee's C312-155 sized at .312 shoot very well with no leading in my Russian SKS. It had a groove diameter of .311. I have shot other cast bullets sized .311 w/o any problems. I use GC'd (Hornady's) bullets and a good NRA 50/50 lube such as Lars...
    7 replies | 270 view(s)
  • Larry Gibson's Avatar
    09-21-2017, 10:54 AM
    Magnum rifle primers were also developed for (other than the large capacity magnums) the use of medium and slower burning ball powders in standard cases, especially for use in colder climates. The CCI 250s work very well in cases from 30-30 up...
    19 replies | 437 view(s)
  • Larry Gibson's Avatar
    09-20-2017, 09:25 PM
    I talked with Al this morning. We reminisced about SSG Pierce and the events 52 years ago today. I also told him I was still holding a grudge he ripped open my pant leg as the rip was from the crotch to below the knee.......thank goodness for...
    21 replies | 691 view(s)
  • Larry Gibson's Avatar
    09-20-2017, 05:25 PM
    On 20 September, 1965 SSG Larry Pierce sacrificed his life to save myself and other of his fellow soldiers near Ben Cat, Republic of South Viet Nam. He was awarded the MOH posthumously. Also wounded in action that day was Alfred Rascon who would...
    21 replies | 691 view(s)
  • Larry Gibson's Avatar
    09-20-2017, 05:20 PM
    Concur with cpaspr ^^^^^^
    75 replies | 2388 view(s)
  • Larry Gibson's Avatar
    09-19-2017, 04:56 PM
    That's why flatness of a fired primer is a poor indication of pressure. I tested some Winchester white box M193 a few years back for a friend. He said he was getting 3340 fps from his 20" AR. That is a bit fast. I stopped after 7 rounds as...
    75 replies | 2388 view(s)
  • Larry Gibson's Avatar
    09-19-2017, 03:35 PM
    vzerone Please don't misunderstand, I was not being critical at all. I was just explaining the why the psi (CUP) figures you posted were different than the psi I posted. It's like driving your car about 60 MPH, your also going about 100...
    75 replies | 2388 view(s)
  • Larry Gibson's Avatar
    09-19-2017, 01:17 PM
    And that's why we saw so many M1917s being used in NMC competition......the M1917s are more accurate and easier to operate, especially in the rapid fire stages than M1903s..........and if you buy that I've got a bridge for sale here in Lake...
    44 replies | 1178 view(s)
  • Larry Gibson's Avatar
    09-19-2017, 01:08 PM
    Previous TMs had definitions and testing procedures. Also the pressures listed are MAPs (Maximum Allowable Pressure). That is not necessarily what any lot of cartrdges is actually loaded to. Cartridges are loaded to a +/- velocity spec not to...
    75 replies | 2388 view(s)
  • Larry Gibson's Avatar
    09-19-2017, 12:59 PM
    Yes the pressures are listed as "psi" but they are measured via CUP method. All older published pressures taken via CUP and LUP were refered to as "psi". However, with the advent of modern and better pressure measuring methods (transducer and...
    75 replies | 2388 view(s)
  • Larry Gibson's Avatar
    09-19-2017, 11:52 AM
    With a bullet stuck in the throat, leade, etc. an AR bolt/carrier when drawn to the rear and released has sufficient momentum to push the next feeding bullet back into the case. I saw this many times over the years even with M193 and M855 ammo. It...
    75 replies | 2388 view(s)
  • Larry Gibson's Avatar
    09-18-2017, 07:34 PM
    Put them in a Tupperware container with lid. Form a small bowl out of tin foil. Put a small chunk of soaking wet sponge (water) in the tin foil. Put sliced apples, slices of oranges or whatever if you want a slight flavor to the cigars. You need...
    14 replies | 410 view(s)
  • Larry Gibson's Avatar
    09-18-2017, 03:11 PM
    I velocity/pressure tested some Venezuelan CAVIM 84 7x57 about 7 - 8 years ago. I would assume it was intended to be used in their FN-49s(?). It was loaded with a 139 gr FMJBT over 45 gr of an extruded powder. Cases were CAVIM 84 lot #101-01. ...
    14 replies | 548 view(s)
  • Larry Gibson's Avatar
    09-18-2017, 01:03 PM
    Did not fire out of battery or bolt and bolt carrier would have been blown to the rear. OP had a bore obstruction. Watch the sequence of events in the video. OP pulled the trigger, just a click, no bang, no recoil. OP Ejected the case and next...
    75 replies | 2388 view(s)
  • Larry Gibson's Avatar
    09-17-2017, 07:28 PM
    I modified a Leupold base to fit the rear sight of one of my "sportered" M91s. I put a Redfield 3X pistol scope on it. It's also D&T'd for a Lyman SME receiver sight and I modified the front base to take an M14 front sight. The Bolt handle is...
    11 replies | 522 view(s)
  • Larry Gibson's Avatar
    09-17-2017, 04:44 PM
    "This has been an interesting read. I am flummoxed as to what this cartridge will do that a 35 Whelen IMP will not?" The 35 XCB (35x57) was designed to feed out of standard Mauser actions w/o any action modifications. The 35 Whelen IMP most...
    82 replies | 10274 view(s)
  • Larry Gibson's Avatar
    09-17-2017, 04:27 PM
    Only 16 and 20" barrels with no mention of twist in 308W. Might do well with some tweaking in CBA commercial rifle matches.
    17 replies | 387 view(s)
  • Larry Gibson's Avatar
    09-17-2017, 04:16 PM
    "Acerbic response".......? You asked the question about Harrison 's theories being disproven. I answered honestly that if proven and reproducible it is no longer theory but fact. I also congradulated you on your own claimed ability and...
    32 replies | 812 view(s)
  • Larry Gibson's Avatar
    09-17-2017, 10:33 AM
    If a "theory's " results are producible then it is no longer a "theory". Years ago when I recovered a lot of my own cast bullets out of a .308W rifle that had been impacted in snow I noticed that many the 311284s which were seated below the case...
    32 replies | 812 view(s)
  • Larry Gibson's Avatar
    09-17-2017, 10:18 AM
    " I ask only because I've always assumed that the primer explosion is not of sufficient strength to cause a primer to move relative to the case." That assumption is incorrect. How much force does it take to seat a primer.....really not much...
    24 replies | 524 view(s)
  • Larry Gibson's Avatar
    09-17-2017, 02:28 AM
    You've all the right parts there. Problem is your not understanding what bullet stabilization is. Bullet stability is simply that the bullet has enough rotational spin to fly point forward. Bullets can be very stable yet inaccurate. It is the...
    82 replies | 10274 view(s)
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About Larry Gibson

Basic Information

Date of Birth
April 15, 1947 (70)
About Larry Gibson
My first reloads were with cast bullets in the 30-30 when I was 14.
Lake Havasu City, Arizona
Shooting, what else?
Retired U.S. Army. Currently contract Research and development of ammuntion and relaods


Larry Gibson

“Deficient observation is merely a form of ignorance and responsible for the many morbid notions and foolish ideas prevailing.”
― Nikola Tesla


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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