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My Handloads - .357 Magnum


WARNING! AUTHOR REJECTS ALL LIABILITY FOR THE USE OF THIS LOAD DATA OR ANY OTHER INFORMATION FOUND ON THIS SITE! ALWAYS RELOAD USING ONLY PUBLISHED LOAD DATA AND PROCEDURES FROM RELIABLE INDUSTRY SOURCES! EMULATE AT YOUR OWN RISK!
Ruger GP100 revolver, 4" barrel

3 March 2007 - 125gr Xtreme FP copper-plated lead, 6.2gr W231 powder, WSPM primer, crimped in provided cannelure
Increased powder charge and magnum primer to address ignition problems and velocity variations in earlier loads
Mild plinking/plates/subversion load that won't foul .357 Magnum chambers as .38 Special rounds will
Approx. 960fps

3 March 2007 - 110gr Speer #4007 JHP (or Hornady #35700 XTP JHP), 8.3gr W231 powder, WSPM primer, crimped in provided cannelure
Similar to Winchester #Q4204 factory load
Magnum primer again addresses ignition problems
Approx. 1,220fps

3 March 2007 - 158gr Xtreme FP copper-plated lead, 5.6gr W231, WSPM primer, crimped in provided cannelure
Heavier load for bowling pins, also good for plates, still rather mild recoil
Magnum primer to address ignition problems
Approx. 820fps

21 July 2007 - 158gr Xtreme FP copper-plated lead, 7.3gr W231, WSPM primer, crimped in provided cannelure
Significantly increased load for bowling pins, also good for plates, increased recoil and blast but still controllable
Magnum primer to address ignition problems - increased use of case capacity also helps
Approx. 1,095fps

6 February 2008 - 155gr cast LRN (Lee #358-150-1R, Lee Liquid Alox tumble lube), 5.3gr W231, WSPM primer, crimped at uppermost groove
Adequate accuracy for a first attempt at casting my own bullets, but very heavy leading.

22 May 2008 - 158gr Xtreme FP copper-plated lead, 4.0gr Unique, WSPM primer, crimped in provided cannelure
Pronounced first-round effect, large variations in velocity. Insufficient use of case capacity. 12-shot average 547fps.

22 May 2008 - 158gr Xtreme FP copper-plated lead, 4.4gr Unique, WSPM primer, crimped in provided cannelure
First-round effect reduced but still present. 12-shot average 603fps.

22 May 2008 - 158gr Xtreme FP copper-plated lead, 5.3gr Unique, WSPM primer, crimped in provided cannelure
First-round effect greatly reduced but still detectable in chronograph data. Recoil increasing. 12-shot average 725fps.

22 May 2008 - 158gr Xtreme FP copper-plated lead, 4.2gr Trail Boss, WSPM primer, crimped in provided cannelure
Pronounced first-round effect. Bad smell from Trail Boss smoke. 12-shot average 657fps.

22 May 2008 - 158gr Silver State LRN, 21gr(v) Pyrodex P, WSPM primer, crimped in provided cannelure
Perfect function, no evident first-round effect. 6-shot average 712fps.

22 May 2008 - 158gr Silver State LRN, 21gr(v) Goex FFFg, WSPM primer, crimped in provided cannelure
Ditto. 6-shot average 690fps.

31 October 2008 - 125gr Xtreme FP copper-plated lead, 7.0gr W231, WSPM primer, crimped in provided cannelure
Milder recoil than the 158gr loads, but pronounced flash and blast. 10-shot average 957fps.

22 May 2008 - 158gr Xtreme FP copper-plated lead, 7.0gr W231, WSPM primer, crimped in provided cannelure
Slightly reduced load to reduce recoil without affecting ignition. 10-shot average 988.1fps.

27 November 2008 - 125gr Xtreme FP copper-plated lead, 4.5gr Bullseye, WSP primer, crimped in provided cannelure
First-round effect difficult to determine from chronograph data, may not be present at all. 10-shot average 869.3fps.

27 November 2008 - 125gr Xtreme FP copper-plated lead, 4.5gr Bullseye, WSPM primer, crimped in provided cannelure
As above. 10-shot average 870.5fps.

27 November 2008 - 125gr Xtreme FP copper-plated lead, 4.5gr Bullseye, CCI500 primer, crimped in provided cannelure
As above. 10-shot average 862.5fps.

27 November 2008 - 125gr Xtreme FP copper-plated lead, 4.5gr Bullseye, CCI550 primer, crimped in provided cannelure
As above. 10-shot average 862.0fps.

18 December 2008 - 149gr cast lead wadcutter (Lyman Ideal #358495, Lee Liquid Alox tumble lube), 3.0gr Bullseye, CCI500 primer, crimped in provided groove
Inconsistent velocity; possible powder-measure issue with this powder. 10-shot average 680.8fps.

18 December 2008 - 149gr cast lead wadcutter (Lyman Ideal #358495, Lee Liquid Alox tumble lube), 3.4gr W231, CCI500 primer, crimped in provided groove
Consistent velocity, no evidence of ignition issues. Good accuracy, very mild recoil. 8-shot average 607.7fps.

18 December 2008 - 149gr cast lead wadcutter (Lyman Ideal #358495, Lee Liquid Alox tumble lube), 4.2gr Universal Clays, CCI500 primer, crimped in provided groove
Inconsistent velocity; possible powder-measure issue with this powder. 9-shot average 762.7fps.

18 December 2008 - 149gr cast lead wadcutter (Lyman Ideal #358495, Lee Liquid Alox tumble lube), 4.5gr Unique, CCI500 primer, crimped in provided groove
Chronograph failed to record most shots. 4-shot average 756.7fps.

19 May 2009 - 156gr cast LRN (Lee #90388, Lee Liquid Alox tumble lube, LOADED AS-CAST, NOT SIZED), 4.9gr W231, WSPM primer, crimped below first rib
Moderate recoil, moderate smoke, adequate accuracy, but some evidence of the first-round powder-shift effect. Ten-shot average 883fps.

19 May 2009 - 156gr cast LRN (Lee #90388, Lee Liquid Alox tumble lube, LOADED AS-CAST, NOT SIZED), 5.3gr W231, WSPM primer, crimped below first rib
Increased recoil, still moderate smoke, adequate accuracy. Ten-shot average 893fps.

19 May 2009 - 156gr cast LRN (Lee #90388, Lee Liquid Alox tumble lube, LOADED AS-CAST, NOT SIZED), 5.5gr W231, WSPM primer, crimped below first rib
Further increased recoil, no significant increase in smoke. Barrel leading. Ten-shot average 963fps.
WARNING! PUBLISHED MAXIMUM LOAD!

19 May 2009 - 156gr cast LRN (Lee #90388, Lee Liquid Alox tumble lube, LOADED AS-CAST, NOT SIZED), 6.1gr W231, WSPM primer, crimped below first rib
Further increased recoil, no significant increase in smoke. Barrel leading. Ten-shot average 1038fps. This load is excessive for unjacketed or unplated bullets and was used for experimental purposes only.
WARNING! EXCEEDS PUBLISHED MAXIMUM LOAD!

19 May 2009 - 149gr cast lead wadcutter (Lyman Ideal #358495, Lee Liquid Alox tumble lube), 3.8gr W231, WSPM primer, crimped in provided groove
Relatively mild recoil, moderate smoke (compared to plated or jacketed), good accuracy. Ten-shot average 823fps.
WARNING! PUBLISHED MAXIMUM LOAD!


WARNING! AUTHOR REJECTS ALL LIABILITY FOR THE USE OF THIS LOAD DATA OR ANY OTHER INFORMATION FOUND ON THIS SITE! ALWAYS RELOAD USING ONLY PUBLISHED LOAD DATA AND PROCEDURES FROM RELIABLE INDUSTRY SOURCES! EMULATE AT YOUR OWN RISK!
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