Position sensitive powders
Recently I decided to get some use from my 396NG (2.5" bbl) that's been hiding in the safe for too long.
Mainly used Power Pistol, LongShot & Blue Dot with HDY 200gr XTP. Also some Rim Rock 185gr LSWC-HP bullets I had a few dozen of & added gas checks (190grs) & sized to .4304"
P-P & L-S usually run real close in smaller capacity cartridges but when I noticed L-S wasn't performing (chrono results) as well as I expected it dawned on me I needed to check for position sensitivity in this cartridge & do some additional follow-up tests with my LabRadar.
The short story on testing from an initial muzzle down position before aiming & then muzzle up is that P-P was virtually unaffected, L-S was next worst & B-D was the most position sensitive with these load fills in the 44 Special.
All powders charges were dispensed from a Charge Master 1500 & then doubled checked on a Lyman Ohaus M5 beam scale before seating the bullet.
Bullet: HDY 200gr XTP
Primer: FED 150
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P-P @ 9.7grs
Muzzle down= 1023fps
Muzzle up= 1029fps
L-S @ 9.7grs
Muzzle down= 984fps
Muzzle up= 1016fps
B-D @ 11.1grs
Muzzle down= 795fps
Muzzle up= 872fps
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Additionally I tested the L-S load using two different primers, FED-150 & CCI-300, to see if there was any difference. (Regrettably I didn't think about also trying some WLPs until later.)
L-S @ 9.7grs
Muzzle up= 1011fps (FED-150)
Muzzle up= 1023fps (CCI-300)
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One other test comparing B-D with the HDY 200gr XTP & the 190gr LSWC-HP-GC bullet.
Bullet: HDY 200gr XTP
Primer: FED-150
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B-D @ 10.3grs= 840fps
B-D @ 10.7grs= 864fps
B-D @ 11.1grs= 872fps
B-D @ 11.5grs= 921fps
&
Bullet: R-R 190gr LSWC-HP-GC
Primer: FED-150
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B-D @ 10.3grs= 840fps
B-D @ 10.7grs= 862fps
Oddly the lead gas check was exactly the same as the jacketed bullet?
Again these velocities are from a 2-1/2" bbl so keep that in mind.
Also, some or all of these loads are +P so use them accordingly in a modern revolver in good repair.
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