I don't understand what niche the 327 Mag is supposed to fill. It doesn't seem to me to be the answer to anything that something else doesn't do much better. So why the interest?
Hello
I have always been a Fan of the .32 Caliber. If you do Not hand load for it, You would not Understand the concept. It is and always has been a super accurate round with Little recoil. I carry The S&W Model 431 PD revolver Chambered in The Infamous .32 H&R Magnum round. I have enhanced the round through hand loading and it exceeds the velocity of the .38 Plus-P round and closely Match's the .357 Magnum round when I Load it for my Model 16-4 K-Frame revolver. Sadly, the .32 H&R Magnum was chosen for a weaker revolver design so Factory Loads are at or Just below the More famous .38 Special round leaving the Public without Need for it. The New Federal .327 Magnum to me, is a caliber that has been expanded on Like the .357 Magnum was using the Old .38 Special cases by lengthening them 1/8".
I too yearned for this .327 Magnum round in a S&W K-Frame sized revolver, But S&W dropped the Ball by only offering it in a Performance Center-J-frame configuration. I heard Hamilton Bowen the famous Gun Maker was Offering the .327 Magnum in a Conversion if you could provide him with a Model 16-4 S&W revolver chambered in .32 H&R Magnum. I Kicked the idea around awhile and called him Three weeks ago to inquire about this Caliber Modification. He shared with me He Takes the K-Frame .32 H&R magnum cylinder and Lengthens the cylinder Throat by using a Custom made Reamer. I set up an appointment to speak with him as he lives 20 Minutes from my home and I wanted to speak one on one about this conversion.
He said to do the Job he would only Need my 16-4 cylinder and Crane assembly so I took it along. He explained that he made sure the cylinder was Heat treated enough to withstand the Higher Pressures of the .327 Magnum round. According to him the .327 magnum round has Twice The SAMI Pressure of The standard factory Loaded .32 H&R Magnum. he concurred hand loaded the .327 Magnum round would Exceed the .357 Magnum velocities. I decided to leave my Cylinder with him for it to be converted. His Price is certainly fair enough at $95.00 and I Just received word he is done with my cylinder so I can drive out and Pick it up.
I Look forward to Re-Loading for this round, and will Post Pictures of the Rounds performance in group size once I work up a good Load for it. Here is my Model 16-4 I No Longer have to wait for S&W to Build one in a K-Frame or Pay Over $1000.00 for a performance Center-J-Frame as I Now will have a Hamilton Bowen Conversion...Below is a Link To Bowen Web Page and his article on This .327 Magnum Conversion. I Look forward to shooting mine. The .327 Magnum Reloading Information shows much Promise, and is very Impressive as well. Hammer It
http://www.bowenclassicarms.com/NEW/Projects.htm#.327_Federal_Magnum_Cartidge
327 Fed. Mag. In 7 1/2-Inch Custom Ruger Blackhawk
Powder
Bullet Type Grs. Primer Velocity (fps) Extreme Spread (fps) Standard Deviation (fps) 25-Yard Accuracy (in.)
Speer 60-gr. Gold Dot Unique 10.0 CCI 500 1900 127 37 2.40
Speer 60-gr. Gold Dot WAP 10.8 CCI 500 2063 139 51 2.50
Magtech 71-gr. JHP W540 9.7 CCI 500 1774 118 33 2.30
Federal 85-gr. Hydra-Shok SR4756 7.4* Fed. 100 1524 45 16 2.20
Federal 85-gr. Hydra-Shok W540 9.1 Fed. 100 1585 85 28 2.00
Sierra 90-gr. JHC AA #7 10.2 Fed. 205 1568 74 20 1.70
Sierra 90-gr. JHC VV 3N37 8.8 CCI 500 1600 48 16 2.60
Hornady 100-gr. XTP-HP HS 6 8.4 CCI 500 1471 70 25 1.60
Hornady 100-gr. XTP-HP VV N350 8.9 CCI 500 1598 69 19 2.00
Speer 100-gr. JHP VV N350 8.9 Fed. 205 1582 56 15 1.70
Speer 100-gr. Uni-Cor HS 7 9.5 CCI 500 1517 79 25 1.90
Speer 100-gr. Uni-Cor Lil'Gun 14.0 CCI 500 1268 120 39 1.70
Speer 115-gr. Gold Dot AA #9 12.8 WS P 1556 62 17 1.80
Magnus 116-gr. RN-FP 700-X 4.1 Fed. 205 1167 36 17 1.60
Magnus 116-gr. RN-FP HP 38 4.5 Fed. 205 1168 36 13 2.10
Magnus 116-gr. RN-FP PB 4.3 Fed. 205 1147 40 13 1.90
Magnus 116-gr. RN-FP SR4756 5.0 Fed. 205 1183 50 16 1.40
Magnus 116-gr. RN-FP Titegroup 4.1 Fed. 205 1188 33 9 1.90
Magnus 116-gr. RN-FP Trail Boss 4.0 Fed. 205 833 137 39 1.80
Magnus 116-gr. RN-FP W231 4.5 Fed. 205 1175 81 21 2.30
Federal PD 85-gr. Hydra-Shok Factory Load 1622 96 28 2.70
American Eagle 100-gr. Uni-Cor Factory Load 1672 40 13 1.50
Speer PP 115-gr. Gold Dot Factory Load 1517 77 22 1.80
*Hodgdon data lists 7.1 gr. maximum for this load.
Notes: All data are based on at least 10 rounds of each load. Accuracy is the average of at least two,-five-shot groups fired from a sandbag benchrest. Factory ammo used Federal factory primed brass with Federal 205 primers.
The range sessions proved successful--eventually. The first time I mounted the SP101 in the HAMMR rest, I forgot to pack my tools to adjust the rest. When it loosened up from the recoil, the groups did likewise, so I just recorded velocity data. When I finished with the SP101, I discovered I didn't have the right grip insert for the custom Blackhawk, so I had to shoot it the old-fashioned way--hand held on sandbags. Despite these minor hurdles, I developed several excellent loads for the two Ruger handguns.
One of the most impressive is Speer's 60-grain Gold Dot HP atop 10 grains of Unique. I rolled a cannelure on the bullets so I could lightly roll crimp them after seating. Load density is essentially 100 percent, and the muzzle velocities reflect the full case and light bullet combination. Later mounted in a properly adjusted HAMMR rest, the SP101 put 10 shots into 1.1 inches at 25 yards.
Accurate #9 and Speer's 115-grain Gold Dot HP proved to be a winning combination also. Federal's American Eagle 100-grain JSP factory ammo consistently delivered excellent performance.
The chart also lists several handloads that worked well in the custom Ruger single-action. Velocities ran from 100 to 250 fps faster in the Blackhawk's 71/2-inch barrel compared to the 31/16-inch-barreled SP101. I also tested a half-dozen or so cast-bullet loads in the Blackhawk using Hodgdon's RDC recommended recipes. As the chart shows, several of those performed quite well. In fact, while measuring them, I noticed that a single shot doubled the group size on several occasions. I'd like to think that Bowen misaligned one chamber, but it's more likely these old eyes.
.327 Fed. Mag. In 6-Inch Pressure Barrel
Powder
Bullet Type Grs. Primer Velocity (fps)
Hornady 60-gr. XTP-HP AA #5 10.5 WSP 2110
Hornady 60-gr. XTP-HP SR7625 9.0 Fed. 100 2050
Speer 60-gr. Gold Dot Unique 10.0 CCI 500 2000
Speer 60-gr. Gold Dot WAP 11.0 Rem. 1 1/2 2140
Federal 85-gr. Hydra-Shok SR4756 10.5 Rem. 1 1/2 1800
Federal 85-gr. Hydra-Shok True Blu 9.0 WSP 1725
Hornady 85-gr. XTP-HP VV N340 7.5 Rem. 1 1/2 1710
Hornady 85-gr. XTP-HP W540 9.0 Fed. 100 1750
Sierra 90-gr. JHC AA #7 10.5 Rem 1 1/2 1775
Sierra 90-gr. JHC VV 3N37 8.8 Lapua SP 1700
Hornady 100-gr. XTP-HP HS 6 8.5 Lapua SP 1575
Hornady 100-gr. XTP-HP VV N350 9.0 CCI 500 1650
Speer 100-gr. Uni-Cor HS 7 9.5 Lapua SP 1600
Speer 100-gr. Uni-Cor Lil'Gun 14.0 CCI 500 1620
Speer 115-gr. Gold Dot AA #9 12.8 WSP 1640
Speer 115-gr. Gold Dot Enforcer 13.5 Rem. 1 1/2 1700
Federal PD 85-gr. Hydra-Shok Factory Load 1685
Speer PP 115-gr. Gold Dot Factory Load 1610
Notes: All data are based on at least 10 rounds of each load. Factory ammo used Federal factory primed brass with Federal 205 primers.