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  1. J

    My thoughts on 22lr barrel length...

    Interior Ballistics: One approach to minimizing the variation in muzzle exit speeds for groups of shots is to make sure that your bullets obturate the bore completely as soon as they engrave the rifling into their bullet shanks. We routinely saw extreme spreads of 2-4 fps in 5-shot group testing...
  2. J

    Are solid/monolithic bullets more finicky than jacketed?

    Thanks, Nik H. Here is a new paper I am writing about the importance of minimizing initial bullet yaw and yaw-rate in long-range rifle shooting. It is based on seeing the results of many runs of my (available by email) Excel spreadsheet calculating recoil induced, vertical plane muzzle motions...
  3. J

    Are solid/monolithic bullets more finicky than jacketed?

    My 6.5 and 338-caliber LAW muzzle brakes were custom designed by Mic and me for hard-mounting Magneto-Speed chronograph sensors. The bottom groove is for clearance of the shop-made offset sensor front-mount, and the top groove is for symmetry. The top plane of the inductive sensor must be...
  4. J

    Are solid/monolithic bullets more finicky than jacketed?

    I have not touched base with Mic McPherson since COVID-19 began. I would recommend a simple little high-evacuation-rate brake on the straight walled 45/70, no matter how hot you might load them. I used bulk packed Remington 300 grain JHP bullets at 2300 fps for plinking from Winchester high-wall...
  5. J

    My thoughts on 22lr barrel length...

    IIRC the guy from the Houston warehouse said that 21.75-inch barrels were most accurate for IBS/NBRSA short-range centerfire benchrest (Sporter and HV classes). That article was much discussed in Precision Shooting Magazine during the 1990's when I started writing articles for them.
  6. J

    Transonic Cone Theory of Bullet Motion

    Your feeling that that bullets having smaller axial inertia values would spin-decay faster is correct, Max, all else being equal. Where you are mistaken is in thinking this would be a large effect. The radius of gyration (kx) of a bullet about its spin-axis varies much more with caliber and...
  7. J

    Transonic Cone Theory of Bullet Motion

    Just out of the muzzle, the initial spin-rate ω0 of the bullet in radians/second is given by: ω0 = 2π*V0/Tw = 2π*12*V0/(n*d) where V0 is the muzzle velocity in feet/second, the twist rate Tw is given in feet/turn, n is the number of calibers/turn, and d is the caliber in inches. Thereafter...
  8. J

    Quick reference guide for SD required to be confident you have a single digit SD load.

    When your rifle and loads start producing very uniform bullet speeds just out of the muzzle, it makes sense to use Extreme Spread (ES) for a group of shots as your performance metric instead of Standard Deviation (SD). We found in our development of monolithic copper ELR bullets that, by...
  9. J

    My thoughts on 22lr barrel length...

    Yes, that is a pretty good analogy. Transonic flight through air is often described as "turbulent" for planes as well as bullets. Long-nosed supersonic rifle bullets tend to become unstable when they fall into the transonic speed range even though their gyroscopic stability is very high (Sg >...
  10. J

    My thoughts on 22lr barrel length...

    Some notes on crosswind sensitivity for 22LR rimfire: As was formulated by DeDion in 1859, air drag causes wind drift "downwind" across the target which is proportional to the actual time-of-flight with air drag minus the hypothetical time-of-flight to the target at the undiminished launch...
  11. J

    My thoughts on 22lr barrel length...

    I've heard everything from 9" to 16" of barrel length for max bullet speed with different types of 22LR ammo. I would estimate about 12" of bullet travel for match ammo.
  12. J

    My thoughts on 22lr barrel length...

    By minimizing the vibrational connections among the four parts I mentioned (barrel, action, stock, and scope), the vibrational effects on the muzzle at bullet exit time are more predictable; i.e., not affected as much by variations in support and hold.
  13. J

    My thoughts on 22lr barrel length...

    You got it, Brianf. I pillar-bed some "action screws" into the bottom of the barrel-block. Be sure the trigger does not contact in the stock or trigger guard. There really is no need for a recoil lug with 22LR, but the bedded rear face of the barrel-block handles even heavy recoil loads. I...
  14. J

    My thoughts on 22lr barrel length...

    Yes, the short barrel length in front of the bedding block is much easier to tune at the muzzle than a long barrel. The clamp-on bedding block should ideally not stress the barrel at all. I find that a scope rail cantilevered from the top of the barrel block is also a good idea for minimizing...
  15. J

    My thoughts on 22lr barrel length...

    Yes, I did that with a "Ruger" 10/22 in a laminated stock. Would be a winner in IR 50/50 if it were legal. Imagine being able to shoot all 25 record shots in one wind condition.
  16. J

    My thoughts on 22lr barrel length...

    Have any of you rimfire guys tried clamp-on barrel-block bedding with the action and front part of the barrel free floating? That gives the barrel vibration tuning ease of the short barrels while retaining the rifle balance, lower subsonic muzzle speed, and greater barrel dwell of a long barrel...
  17. J

    Do All Hunting Round Decision? Rifle Build help

    Back in the 1930's many hunters considered the 35 Remington to be their ideal "Do anything" cartridge. I guess the animals are a lot bigger and tougher now, though. A deadly 200-gr soft-point bullet and you can still "eat right up to the hole." I like my Remington Model 141 slide-action carbine...
  18. J

    Quietest (least loud) 100-115 yard gun/ammo that isn't suppressed? Shotgun and AR15 are too loud for my yard (7 acres, neighbors aren't that close).

    I have done some R&D work on exactly what the OP is requesting, inspired by an article by P. T. Kekkonen (GunWritersontheWeb), "Silent without a Silencer." In the Winter War (1939-1940), Finnish Rangers made short-range assassination guns from captured Soviet equipment. They pulled the 86-gr...
  19. J

    Sidearms & Scatterguns Favorite handgun type

    In all seriousness, my duty pistol was a full-sized custom 1911 in 45 ACP loaded with RCBD Totally Frangible extremely high velocity ammo. My EDC is now a Colt Concealed Carry Officer's Model loaded with Hornady 45 ACP Critical Defense ammo backed up by a Ruger LC9s loaded with Black Hills...
  20. J

    Sidearms & Scatterguns Favorite handgun type

    Let's just say I recognized good design DNA when I saw it. The roller locking action is as obsolete as your MP5. Post-war manufacturing was hit-or-miss and some materials used were not up to today's standards. 1. Expanding military bullets were outlawed by the Hague Conventions. Ballistics at...
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