David Bradshaw Photos Vol. 99 – Powder Coat Part 4

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Lee Martin

Hunter
Joined
Dec 18, 2002
Messages
2,313
Location
Arlington, Virginia
Freedom Arms M83 .44 Mag cylinder. 327 grain LFN (Long Flat Nose) Gas Check, casting and Powder Coat by Tank Hoover. Bullets do not thumb-press through chamber exit holes. DEEP SEAT and roll crimp on beginning of ogive. Bullet contacts chamber throat (exit hole) as round is fully chambered. Tighter bullet sizing die would ease chambering, permit roll crimp in crimp groove. Charge of 19/H110 just about meets bullet base, easily room for one more grain. Firing rounds produced no evidence of leading of chamber leade or throat, nor in barrel forcing cone or bore.



Tank Hoover’s bullet making process: 1) cast. 2) powder coat. 3) size, or apply gas check & size.

This Freedom Arms .44 cylinder has .429” exit holes. These 327 grain LFN GC bullets cast by Tank Hoover were sized .430-inch. Bullets do not thumb-press through chamber throats. Only the target can tell whether it harms accuracy to pinch a bullet in the exit hole. That no leading was found in chamber leade, throat, forcing cone, or bore after shooting Hoover’s PC bullets——262 LFN HP, 272 LFN, 327 LFN GC——suggests the powder coat process may introduce forgiveness to a cast bullet which grease on lead alloy does not.



The FORCING CONE is a necessary evil, analogous to the LEADE in a rifle barrel. Both must provide a smooth transition between the chamber exit and the LANDS of the rifling. As the revolver chamber is separate from the barrel, the forcing cone must accommodate minor chamber-to-bore offset. Too much forcing cone, or an off-axis forcing cone invites OBTURATION, or distortion of the bullet. A proper forcing cone cannot cure a bad barrel, nor make up for gross chamber-to-bore offset. By any measure this is a minimal forcing cone.


Cast .44 Powder Coat 327 grain LFN GC snugs forcing cone of Shilen barrel in Freedom Arms M83. Jim Stroh cut very short 11-degree cone on lathe. Bullet acts as alignment pin between chamber and bore——providing chamber throats and forcing cone are not grossly oversize. The 11-degree forcing cone is an industry standard, not a custom gunsmith invention.



Three Tank Hoover P0WDER COAT bullets were tried in the Freedom Arms .44 with Shilen barrel. Powder charge same as moderate charge of 22.5/H110 under Sierra’s excellent 250 FPJ and 210 JHC. One prior shot was fired at a separate target to check ZERO----the 262-grain LFN HP over 22.5/H110 printed 8” high @ 50 yards. To put POI (Point of Impact) close to center, the Leopold DOT reticle implanted edge of cardboard @ 6 o’clock (sketched in blue).

262 LFN HP is hollow point version of 272 LFN. While 262 LFN HP may appear more accurate on this target, human factor intervened on groups fired with 272 LFN and 327 LFN GC. Revolver fired from trunnion position on single sandbag.



Sketched in blue, Leupold Dot-on-crosshair reticle records very high impact of PC bullets @ 50 yards with scope sighted for Sierra 250 FPJ jacketed rounds. Same 22.5/H110 powder charge



REDDING COMPETITION SEATER remains Bradshaw’s favored die for effortless, straight-line seating with disparate nose profiles. Each hashmark represents .001-inch change in depth; “20” equals .020”, etc. In conjunction with seating, a Redding expander with built-in step helps start bullet square, with a minimum of flare at the mouth for long case life. Target 50 yards.



3 groups @ 100 yards
1) Cast LBT 262 LFN HP, powder coat.

Promise of accuracy @ 50 yards give way to dispersion @ 100 yards. As first 4-shots group 2.7-inches, with 5th shot dropping to open 5x5 to 3.8-inches, actual dispersion cannot be concluded.

2) Cast LBT 272 LFN, powder coat.

Consistency very likely to repeat, as 5x5=2.3-inches @ 100 yards, with 4X5 into 2.0-inches. Suspect that with the anneal from 400-degrees fahrenheit during powder coat, this bullet should prove excellent on soft skin game up to 400 pounds and, in some instances, greater weight.

3) Sierra .4295 250-grain FPJ silhouette bullet.

Fired as a control, first 4-shots print 1.5-inches. Shot #5 is called “6 o’clock,” and, alas, opens group to 2.7-inches. The five Sierras fired post-sunset. (Velocity of “1456 fps” is incorrect. Five shots of Sierra 250 FPJ over 22.3/H110 average 1,426 fps.)

Preliminary finding

These powder coat bullets shoot. The cast 262 LFN HP and 272 LFN over 22.5/H110 could be and were interchanged with jacketed Sierra bullets without the firing of fouling shots to settle ZERO. However, Point of Impact (POI) of the cast powder coat bullets averages 8" higher @ 50 yards, and 14” higher @ 100 yards, than the Sierra 250 FPJ with the same powder & charge.

 

contender

Ruger Guru
Joined
Sep 18, 2002
Messages
22,128
Location
Lake Lure NC USA
I know you were a bit slower to get into using the PC bullets,,, but you, like many of us have learned that they do quite well. Dick got me started,,, and I'm sold.
Looks like you are too by the excellent results here.
 

David Bradshaw

Blackhawk
Joined
Sep 11, 2012
Messages
933
Tyrone.... thanks to Jeff "Tank" Hoover and, by extension, old silhouetter Dick Thompson, a cast bullet that combines expansionist attributes of a proper jacketed slug has come my way. No longer plying the STEEL SHOOTING trade, and trapped somewhere between the golfer and the boxer who cannot quit, I am forced to keep on shooting to keep on learning. Against the flood of high tech gismos, there is something to be said for my old farmer/logger neighbor who, handing his son a Winchester Model 94 .30-30 and two cartridges, "Bring back a deer or them two shells."
David Bradshaw
 

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