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  • Larry Gibson's Avatar
    Yesterday, 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...
    68 replies | 1716 view(s)
  • Larry Gibson's Avatar
    Yesterday, 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...
    68 replies | 1716 view(s)
  • Larry Gibson's Avatar
    Yesterday, 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...
    40 replies | 893 view(s)
  • Larry Gibson's Avatar
    Yesterday, 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...
    68 replies | 1716 view(s)
  • Larry Gibson's Avatar
    Yesterday, 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...
    68 replies | 1716 view(s)
  • Larry Gibson's Avatar
    Yesterday, 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...
    68 replies | 1716 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...
    12 replies | 303 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 | 513 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...
    68 replies | 1716 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 | 471 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 | 10156 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.
    12 replies | 270 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 | 734 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 | 734 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 | 451 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 | 10156 view(s)
  • Larry Gibson's Avatar
    09-17-2017, 02:20 AM
    The force of the LR primer explosion in the primer pocket pushes the case forward in the chamber. That resizes the case just like when you push the case into a sizing die. Eccept the case is already sized so the chamber shoulder sets the case...
    24 replies | 451 view(s)
  • Larry Gibson's Avatar
    09-16-2017, 11:41 PM
    Unbalanced bullets do in fact, stabilize. Please, let us not confuse bullet stability with the decreases in accuracy unbalanced bullets can have. Unbalances in bullets is the primary reason why we shoot groups instead of all the bullets going...
    82 replies | 10156 view(s)
  • Larry Gibson's Avatar
    09-16-2017, 10:43 PM
    I believe Brophy answers the question in his book.
    40 replies | 893 view(s)
  • Larry Gibson's Avatar
    09-16-2017, 10:40 PM
    BTW; For practice I use the same bullet cast of COWWs + 2% tin WQ'd with the same load. These are not HP'd. They can also be shot all day maintaining accuracy where as the softer alloyed bullets need the barrel cleaned every 8 to 10 shots to...
    11 replies | 346 view(s)
  • Larry Gibson's Avatar
    09-16-2017, 10:38 PM
    I use COWWs +2% tin then mixed 50/50 with lead for my RCBS 35-200-FN cast bullets. These are pushed to 2150 fps out of my M91 Argie 35 Rem. I also HP the bullets 3/16" deep with the 1/8" Forster HP tool. It works for me.
    11 replies | 346 view(s)
  • Larry Gibson's Avatar
    09-16-2017, 10:30 PM
    Try backing the FL sizer out a tudge so the expander just expands the inside .001+. If the rounds with a "bulge" at the base of the bullet are not equally "bulged all the way around the case the bullet is not seated straight......it is canted. ...
    10 replies | 269 view(s)
  • Larry Gibson's Avatar
    09-16-2017, 10:25 PM
    Larry Gibson replied to a thread How heavy ? in Cast Boolits
    I have to go with this also because it's what I do with my 30/31 cal rifles. I shoot cast bullets ranging from 90 gr up through 220 gr. Which I use depends on the application intended.
    14 replies | 556 view(s)
  • Larry Gibson's Avatar
    09-16-2017, 10:21 PM
    If you seat a cast bullet, GC'd or not, below the case neck of a bottle necked cartridge there may or may not be a noticeable affect. Whether there is or not depends on several things; Intensity of the load (heat generated and time of exposure...
    32 replies | 734 view(s)
  • Larry Gibson's Avatar
    09-16-2017, 02:15 PM
    Milsurps with unpitted bores; yes. Milsurps with pitted bores; no.
    17 replies | 651 view(s)
  • Larry Gibson's Avatar
    09-16-2017, 02:13 PM
    The shoulder of the case does not get moved forward on firing.....it gets moved back. I shoot many thousands of squib loads in various calibers but mostly in .30s. Many of these are rimless cartridges; 30-06, .308, .308 CBC, 7.65, 7.62x39 etc....
    24 replies | 451 view(s)
  • Larry Gibson's Avatar
    09-16-2017, 01:58 PM
    Since they would essentially be in the same classification as a "firearm" my assumption is a manufacturers FFL would be needed. Under that you can get approval to manufacture a firearm w/o the FFL but it involves paperwork and, I believe(?), paying...
    12 replies | 333 view(s)
  • Larry Gibson's Avatar
    09-14-2017, 11:41 AM
    Partly true. Ball powders, the medium and slower burning ones, are harder to ignite because of the heavier retardants used on the to control the burn rate.
    8 replies | 289 view(s)
  • Larry Gibson's Avatar
    09-14-2017, 11:36 AM
    I don't recall seeing any load data for RBs in the 308W in any Lyman manual. Suggest you try Bullseye powder; 1.5 to 3 gr. No filler or wad is used. That will keep you in the accuracy range for RBs. 3 gr will not generate enough psi to expand...
    10 replies | 457 view(s)
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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