I've done quite a lot of tests now and the question sprang to mind "Which is the best?" - To answer that question, I put together a spreadsheet and the results can be seen below.

It makes quite interesting reading, but obviously is just the results of DumboRAT and my testing. However, as we're in similar territory it is probably safe to assume most people could achieve results close to these.

All the results are sorted by best 5 round grouping.

Make Original Make Unit Type Diameter (MM) best 5 of 6 Diameter(IN) best 5 of 6 Who? Test Date Notes
Western Arms Colt Delta Elite SCW GBB 14 0.549 SM 04/06/2005 All 6!
Airsoft Surgeon Colt DumboRAT special Infinity based GBB 15 0.588 DR 01/01/2004
Western Arms Colt 1911 Series 70 SCW GBB 17 0.667 SM 04/06/2005 All 6 under 25
Tanaka  Luger  P08 Artillery 8" GBB 17.5 0.686 SM 14/12/2004
Western Arms Beretta M92FS Competiton GBB 17.5 0.686 SM 23/06/2004
Western Arms Beretta Cougar Warrior GBB 17.5 0.686 SM 19/06/2004
Western Arms Beretta  Elite CQB GBB 20 0.784 SM 08/05/2004
KSC STI 5.5 Hybrid Limited GBB 25 0.980 SM 21/01/2006 Only 10C
Tokyo Marui Steyr GB NBB 25 0.980 SM 10/09/2005
Western Arms Para Ordnance SCW HRT (Black) GBB 25 0.980 SM 29/05/2004
Western Arms Beretta Elite 2 GBB 25 0.980 SM 01/01/2004
Tokyo Marui Sig Sauer P226 GBB 27 1.059 SM 27/08/2005
WE Metal Hi Capa 5.1 GBB 30 1.176 SM 05/07/2005
Tanaka Smith & Wesson M500 8 3/8" NBB 30 1.176 SM 08/06/2005 All low of aimpoint on 134a
Western Arms Para Ordnance P14-45 Two Tone GBB 30 1.176 SM 04/03/2005
Kang Nam Beretta M9 Dolphin (.12g BBs) Spring Non Hop 30 1.176 SM 14/12/2004
Tokyo Marui IMI Desert Eagle GBB 30 1.176 SM 02/06/2004
Western Arms Wilson Combat Striker GBB 30 1.176 SM 08/05/2004
Marushin Mauser M712 NBB 30 1.176 SM 01/04/2004
Western Arms Wilson Combat Hi Cap CQB Special GBB 30 1.176 DR 01/01/2004
HFC Beretta M9 M190 GBB 32 1.255 SM 05/02/2005
Western Arms Strayer Voight Infinity Expert 5" GBB 33 1.294 SM 19/01/2005
Western Arms Beretta M9 HW Olive Drab GBB 33 1.294 SM 17/01/2005
Maruzen H&K MP5K GBB 33 1.294 SM 23/11/2004
Tokyo Marui H&K MP7 A1 AEP 35 1.373 SM 08/03/2006
Western Arms Colt 1911A1 Magna Tech GBB 35 1.373 SM 21/01/2006 Only 10C
Western Arms Smith & Wesson 4013TSW GBB 35 1.373 SM 08/06/2005 Mixed gas - Two clusters
Western Arms Wilson Combat SDS  GBB 35 1.373 SM 04/06/2005
Western Arms Wilson Combat MEU 1911 Early Model GBB 35 1.373 SM 04/06/2005
Western Arms Wilson Combat Hi Cap CQB Special with LRB GBB 35 1.373 SM 05/05/2005 24 for 4
KJW H&K USP Tactical GBB 35 1.373 SM 13/10/2004
KSC Glock 34 GBB 35 1.373 SM 21/07/2004
Western Arms Strayer Voight Infinity Std 6" Single Stacker GBB 35 1.373 SM 08/05/2004
Tokyo Marui H&K Mk23 Spring Hop-Up 35 1.373 SM 01/01/2004
Airsoft Surgeon Colt 1911 Tuned GBB 35 1.373 DR 01/01/2004
Western Arms Beretta M8045 Cougar GBB 35 1.373 SM 01/01/2004
Western Arms Beretta 1934 GBB 35 1.373 SM 01/01/2004
Western Arms Colt 1911 Mark IV Model 70 GBB 35 1.373 SM 01/01/2004
Western Arms Para Ordnance P14-45 Prokiller Combat GBB 35 1.373 SM 01/01/2004
Western Arms Colt 1911 TRP Clone GBB 35 1.373 DR 01/01/2004
Western Arms Strayer Voight Infinity Expert 4.3" GBB 36 1.412 SM 19/01/2005
Western Arms Strayer Voight Infinity Hybrid Comp GBB 36 1.412 DR 01/01/2004
Western Arms Smith & Wesson Sigma GBB 37 1.451 SM 14/07/2004
KJW H&K USP GBB 38 1.490 DR 01/01/2004
Western Arms Smith & Wesson Shorty .40 GBB 38 1.490 DR 01/01/2004
Marushin Ruger Super Black Hawk NBB 40 1.569 SM 21/01/2006
SIIS IMI Desert Eagle 10" GBB 40 1.569 SM 01/10/2005
Tokyo Marui Hi Capa 5.1 GBB 40 1.569 SM 04/06/2005
KSC H&K Mk23 Metal slide GBB 40 1.569 SM 20/04/2005
Western Arms Wilson Combat Professional Compact GBB 40 1.569 SM 07/02/2005 10 shots 10 CM across
Western Arms Jatimatic   NBB 40 1.569 SM 05/02/2005
KSC H&K USP Compact GBB 40 1.569 SM 23/11/2004
Tanaka Ruger Super Redhawk  NBB 40 1.569 SM 05/10/2004
KWC Walther P99 Spring Non Hop 40 1.569 SM 01/01/2004
Tokyo Marui Beretta M8000 Cougar Spring Non Hop 40 1.569 SM 01/01/2004
UHC Beretta M9 Spring Hop-Up 40 1.569 SM 01/01/2004
JAC Browning Hi Power Mk3 Target GBB 40 1.569 SM 01/01/2004
KSC Beretta M93R II GBB 40 1.569 SM 01/01/2004
KSC H&K Mk23 GBB 40 1.569 SM 01/01/2004
Western Arms Beretta M84 Cheetah GBB 40 1.569 SM 01/01/2004
Marushin Derringer 6mm NBB 42 1.647 DR 01/01/2004
Tokyo Marui IMI Desert Eagle Hardkick GBB 43 1.686 SM 08/06/2005 Very tight 3 shot group
Western Arms Wilson Combat Hi Cap CQB Special GBB 43 1.686 SM 13/10/2004
KWC Colt Python 6" NBB 43 1.686 DR 01/01/2004
Western Arms Beretta  M92FS Perfect Version GBB 43 1.686 DR 01/01/2004
Marushin Beretta  M92F NBB 45 1.765 SM 25/03/2006
Western Arms Colt 1911A1 Military GBB 45 1.765 SM 08/06/2005 3 close pairings - mixed gas
Western Arms Colt Defender GBB 45 1.765 SM 08/06/2005 32 for 4 shots
Western Arms Beretta Cougar SCW GBB 45 1.765 SM 04/06/2005
Western Arms Para Ordnance SCW HRT (Black)  GBB 45 1.765 SM 26/03/2005
Western Arms Beretta Elite 1A Silver GBB 45 1.765 SM 05/02/2005
Western Arms Para Ordnance P14-45 Silver GBB 45 1.765 SM 08/05/2004
Western Arms Wilson Combat CQB GBB 45 1.765 SM 08/05/2004
Tokyo Marui S&W PC 356 Spring Hop-Up 45 1.765 SM 01/01/2004
Maruzen S&W M4506 NBB 45 1.765 SM 01/01/2004
Tanaka Smith & Wesson M29 Flatside 3" NBB 45 1.765 DR 01/01/2004
KSC Beretta Elite GBB 45 1.765 SM 01/01/2004
KSC Beretta M9 GBB 45 1.765 SM 01/01/2004
Western Arms Para Ordnance Ultimate Competition GBB 45 1.765 SM 01/01/2004
Western Arms Strayer Voight Infinity Xcellerator 6" Hybrid GBB 45 1.765 SM 01/01/2004
Western Arms Para Ordnance Ltd GBB 47 1.843 SM 08/06/2005 Hard kick!
Western Arms Strayer Voigt Infinity Hybrid Comp 6" GBB 47 1.843 SM 09/02/2005
Western Arms Strayer Voight Infinity Xcellerator 5" Fluted Black GBB 47 1.843 SM 08/05/2004
Marushin Walther P38 NBB 47 1.843 SM 01/01/2004
KSC Beretta  M9 GBB 47 1.843 DR 01/01/2004
Western Arms Para Ordnance Doberman GBB 48 1.882 SM 08/05/2004
KSC Sig Sauer SP2009 GBB 49 1.922 DR 01/01/2004
Western Arms Wilson Combat Tactical Special GBB 50 1.961 SM 04/03/2005
Western Arms Strayer Voight Infinity SCW 6" GBB 50 1.961 SM 17/01/2005
KJW Ruger Mk1 NBB 50 1.961 SM 13/11/2004
KWA Glock 19 GBB 50 1.961 SM 08/05/2004
KWC S&W M4505 Spring Non Hop 50 1.961 SM 01/01/2004
Marushin AMT Automag NBB 50 1.961 SM 01/01/2004
Tanaka S&W M629 8" NBB 50 1.961 SM 01/01/2004
Tokyo Marui H&K Mk23 NBB 50 1.961 SM 01/01/2004
KSC S&W M945 GBB 50 1.961 SM 01/01/2004
KSC Smith & Wesson M945 (Black) GBB 50 1.961 DR 01/01/2004
Maruzen Walther P99 GBB 50 1.961 DR 01/01/2004
Western Arms Beretta M92FS Competition GBB 50 1.961 SM 01/01/2004
Western Arms Beretta M84 Cheetah Spy Pack GBB 50 1.961 SM 01/01/2004
Western Arms Strayer Voight Infinity Prokiller 3.9" GBB 50 1.961 SM 01/01/2004
Western Arms Strayer Voight  Infinity GIGANT GBB 50 1.961 SM 01/01/2004
Western Arms Strayer Voight  Infinity SCW 5" GBB 52 2.039 SM 19/01/2005
Western Arms Colt 1911 Mark IV Model 80 GBB 53 2.078 SM 08/06/2005
Tanaka Colt SAA NBB 54 2.118 SM 27/10/2004
Western Arms Colt 1911 US Army GBB 55 2.157 SM 08/06/2005 2 25mm clusters of 3
Western Arms Beretta 1934 Silver GBB 55 2.157 SM 05/02/2005
MGC H&K P7 M13 GBB 55 2.157 SM 10/01/2005
Western Arms Para Ordnance SCW HRT (Parkerised) GBB 55 2.157 SM 08/05/2004
Maruzen Walther P99 GBB 55 2.157 SM 01/01/2004
Western Arms Beretta M92FS Inox GBB 55 2.157 SM 01/01/2004
KSC  Sig Sauer PRO 2340 GBB 57 2.235 SM 10/09/2005
Western Arms Wilson Combat Tactical Compact GBB 57 2.235 SM 17/01/2005
Maruzen Walther PPK GBB 58 2.275 DR 01/01/2004
Tokyo Marui H&K USP Spring Non Hop 60 2.353 SM 01/01/2004
KSC Glock 18C GBB 60 2.353 SM 01/01/2004
KSC Glock 17 GBB 60 2.353 SM 01/01/2004
Western Arms Strayer Voight Infinity Ltd 5" GBB 60 2.353 SM 01/01/2004
Western Arms Strayer Voight Infinity Xcelerator Compact GBB 60 2.353 SM 01/01/2004
Western Arms Wilson Combat Vreaker 12 GBB 60 2.353 SM 01/01/2004
Marushin Taurus Raging Bull 8.375" NBB 63 2.471 DR 01/01/2004
Tokyo Marui CZ Model 75 Spring Hop-Up 65 2.549 SM 20/04/2005
Western Arms Beretta M92FS Perfect Version GBB 65 2.549 SM 26/03/2005
Western Arms Strayer Voight Infinity Ltd 6" GBB 65 2.549 SM 01/01/2004
Western Arms Smith & Wesson Sigma Metal Slide GBB 70 2.745 SM 04/03/2005
Tanaka S&W Model 29 6.5" NBB 70 2.745 SM 01/01/2004
KSC Glock 18C GBB 72 2.824 DR 01/01/2004
Marushin Derringer 6mm NBB 75 2.941 SM 02/05/2005 130 for 5
Marushin COP 357 8mm (short barrel) NBB 75 2.941 SM 02/05/2005 95 for 5
Tokyo Marui Glock 18C EBB 75 2.941 SM 09/11/2004
Tanaka S&W PC 629 V-Comp NBB 75 2.941 SM 13/10/2004
Tanio Koba H&K VP70 GBB 75 2.941 SM 02/06/2004
Western Arms Strayer Voight Tactical Carry GBB 75 2.941 SM 08/05/2004
Marushin Mauser M712 NBB 75 2.941 SM 01/01/2004
Marushin Derringer 6mm NBB 80 3.137 SM 23/11/2004
KWC Colt 1911 A1 Custom Spring Non Hop 80 3.137 SM 01/01/2004
Western Arms Beretta M92FS (Early Version) GBB 85 3.333 SM 10/09/2005
Marushin Taurus Raging Bull NBB 90 3.529 SM 01/01/2004
Hsu Wei Browning Hi Power Mk3 GBB 90 3.529 SM 01/01/2004

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