A guy on suabier.com sent me this.
17MachIV Load Data
Cooper M21 - s/n MTV433 Neck Diameter: 0.199" 25 gr. Berger square lande mark = 2.606 Comp OAL
Trim Length: 1.430" Neck Wall thickness: 0.0135" 25 gr. Berger MEF square lande mark = 2.597 Comp OAL
FL Size Headspace: 1.089" 22 gr. Berger MEF square lande mark = 2.601 Comp OAL
20 gr. Berger MEF square lande mark = 2.610 Comp OAL
20 gr. Hornady V-max square lande mark = x.xxx Comp OAL
H4227 POWDER CHARGE BULLET WEIGHT BULLET PRIMER BRASS VELOCITY COMMENTS
REM 14.9 20 V-max BR4 .221 4,000
Stevespages.com 12.4 20 V-max Rem 7.5 .221
Stevespages.com 13.4 20 V-max Rem 7.5 .221
Stevespages.com 11.8 25 Berger Rem 7.5 .221
Stevespages.com 14.6 25 Berger Rem 7.5 .221
Benchrest.com/sst/mach 15.6 25 Berger Rem 7.5 .221 3,700
H4198 POWDER CHARGE BULLET WEIGHT BULLET PRIMER BRASS VELOCITY COMMENTS
Stevespages.com 14.3 20 V-max Rem 7.5 .221
REM 16.0 20 V-max Rem 7.5 .221
Reloadersnest.com - T. Steger 16.0 20 V-max BR4 .221 Load ID 8851
Stevespages.com 16.7 20 V-max Rem 7.5 .221
Todd Kindler 15.5 25 Berger CCI 400 .221 3,633
Todd Kindler 16.1 25 Berger CCI 400 .221 3,735 Accurate
Stevespages.com 13.6 25 Berger Rem 7.5 .221
Stevespages.com 16.0 25 Berger Rem 7.5 .221
Todd Kindler 16.4 25 Berger CCI 400 .221 3,819 Very accurate - approach carefully
Todd Kindler 16.7 25 Berger CCI 400 .221 3,855 Very accurate - approach carefully
Todd Kindler 17.0 25 Berger CCI 400 .221 3,923 Very Accurate - MAXIMUM
Accuratereloading.com 13.0 30 Berger WSR .221 2,894 Fire Forming Load
Accuratereloading.com 13.5 30 Berger WSR .221 2,968
Accuratereloading.com 13.8 30 Berger WSR .221 3,001
Accuratereloading.com 14.1 30 Berger WSR .221 3,053
Accuratereloading.com 14.4 30 Berger WSR .221 3,178
Accuratereloading.com 14.7 30 Berger WSR .221 3,227
Accuratereloading.com 15.0 30 Berger WSR .221 3,293
Accuratereloading.com 15.0 30 Berger WSR .221 3,322
Accuratereloading.com 3.0 30 Berger WSR .221 3,387
Accuratereloading.com 15.6 30 Berger WSR .221 3,453 Accurate
Accuratereloading.com 15.9 30 Berger WSR .221 3,546
Reloader 7 POWDER CHARGE BULLET WEIGHT BULLET PRIMER BRASS VELOCITY COMMENTS
Stevespages.com 14.2 20 V-max Rem 7.5 .221
Stevespages.com 16.3 20 V-max Rem 7.5 .221
Stevespages.com 12.8 25 Berger Rem 7.5 .221
Stevespages.com 15.7 25 Berger Rem 7.5 .221
Reloader 10X POWDER CHARGE BULLET WEIGHT BULLET PRIMER BRASS VELOCITY COMMENTS
Dan C 17.4 20 V-max Rem 7.5 .223 3,945
Dan C 18.3 20 V-max Rem 7.5 .223 4,140
LHH 17.0 30 Kindler Rem 7.5 221 3,515
LHH 17.3 30 Kindler Rem 7.5 221 3,583
Ramshot X-Term POWDER CHARGE BULLET WEIGHT BULLET PRIMER BRASS VELOCITY COMMENTS
Dan C 19.6 20 V-max Rem 7.5 .223 4,080
Dan C 19.8 20 V-max Rem 7.5 .223 4,110
H322 POWDER CHARGE BULLET WEIGHT BULLET PRIMER BRASS VELOCITY COMMENTS
??? 17.5 20 V-max Fed 205M .221
Chucker 19.5 20 V-max Rem 7.5 .221 4,350 MAX LOAD
Todd Kindler 17.5 25 Berger Rem 7.5 .221 3,667
Todd Kindler 17.8 25 Berger Rem 7.5 .221 3,726
Todd Kindler 18.0 25 Berger Rem 7.5 .221 3,776
Todd Kindler 18.3 25 Berger Rem 7.5 .221 3,825 Very accurate
Todd Kindler 18.6 25 Berger Rem 7.5 .221 3,870 Very accurate
N130 POWDER CHARGE BULLET WEIGHT BULLET PRIMER BRASS VELOCITY COMMENTS
Stevespages.com 14.8 20 V-max Rem 7.5 .221
Stevespages.com 16.9 20 V-max Rem 7.5 .221
Stevespages.com 13.6 25 Berger Rem 7.5 .221
Stevespages.com 16.4 25 Berger Rem 7.5 .221
Accuratereloading.com 14.0 30 Berger WSR .221 2,953
Accuratereloading.com 14.3 30 Berger WSR .221 3,008
Accuratereloading.com 14.6 30 Berger WSR .221 3,083
Accuratereloading.com 14.9 30 Berger WSR .221 3,179
Accuratereloading.com 15.2 30 Berger WSR .221 3,225
Accuratereloading.com 15.5 30 Berger WSR .221 3,266
Accuratereloading.com 15.8 30 Berger WSR .221 3,295
Accuratereloading.com 16.1 30 Berger WSR .221 3,388
Accuratereloading.com 16.4 30 Berger WSR .221 3,468
Accuratereloading.com 16.7 30 Berger WSR .221 3,529
Accuratereloading.com 17.0 30 Berger WSR .221 3,592
Accuratereloading.com 17.3 30 Berger WSR .221 3,655 Accurate
Accuratereloading.com 17.6 30 Berger WSR .221 3,710
Accuratereloading.com 17.9 30 Berger WSR .221 3,778
N133 POWDER CHARGE BULLET WEIGHT BULLET PRIMER BRASS VELOCITY COMMENTS
Montdoug 18.2 20 Berger Rem 7.5 .221 4,080
Phil Maxwell 18.2 20 V-max Fed 205M .223 Warm
Dan C 18.5 20 V-max Rem 7.5 .223 4,040 Use in my Shilen CZ rebarrel, 4110fps with 25" barrel, FB brass
Dan C 19.0 20 V-max Rem 7.5 .223 4,200
Todd Kindler 15.5 25 Berger CCI 400 .221 3,251
Todd Kindler 16.0 25 Berger CCI 400 .221 3,399
Todd Kindler 16.5 25 Berger CCI 400 .221 3,501
Todd Kindler 17.3 25 Berger CCI 400 .221 3,567
Alex 17.5 25 Berger Fed 205M .221 Fireforming load
Alex 17.7 25 Berger Fed 205M .221
Todd Kindler 17.8 25 Berger CCI 400 .221 3,641 Accurate
Alex 17.9 25 Berger Fed 205M .221
Todd Kindler 18.1 25 Berger CCI 400 .221 3,753 Approach carefully - accurate
Todd Kindler 18.3 25 Berger CCI 400 .221 3,842 Approach carefully - accurate
Todd Kindler 18.5 25 Berger CCI 400 .221 3,909 Approach carefully - accurate
17VLD 19.0 25 Starke Fed 205M ? Hot
Accuratereloading.com 15.0 30 Berger WSR .221 2,960 Claims 133 is too slow for Mach IV
Accuratereloading.com 15.5 30 Berger WSR .221 3,059
Accuratereloading.com 16.0 30 Berger WSR .221 3,166
Accuratereloading.com 16.5 30 Berger WSR .221 3,304
Accuratereloading.com 17.0 30 Berger WSR .221 3,336 Accurate
Accuratereloading.com 17.5 30 Berger WSR .221 3,433
BENCHMARK POWDER CHARGE BULLET WEIGHT BULLET PRIMER BRASS VELOCITY COMMENTS
Phil Maxwell 19.3 20 V-max Fed 205M .223 Seat .015 into lands - turn necks to .0135
Dan C 19.2 20 V-max Rem 7.5 .223 4,030 Seat .015 into lands - turn necks to .0135
Dan C 19.5 20 V-max Rem 7.5 .223 4,100 Seat .015 into lands - turn necks to .0135
Lee in OH 16.8 25 Starke CCI 400 .221 3,352 22" TC barrel
Lee in OH 17.1 25 Starke CCI 400 .221 3,413 22" TC barrel
Lee in OH 17.4 25 Starke CCI 400 .221 3,486 22" TC barrel
Lee in OH 17.7 25 Starke CCI 400 .221 3,564 22" TC barrel
Lee in OH 18.0 25 Starke CCI 400 .221 3,539 22" TC barrel
Lee in OH 18.3 25 Starke CCI 400 .221 3,649 22" TC barrel
Dan C / Tom Moore 18.4 25 Berger Rem 7.5 .223 3,760 Turn necks to .0135 - cases hold .3 to .4 less than .221 - seat square into lands
Lee in OH 18.6 25 Starke CCI 400 .221 3,693 22" TC barrel
Lee in OH 18.9 25 Starke CCI 400 .221 3,776 22" TC barrel
Dan C 19.0 25 Berger Rem 7.5 .223 3,750 Turn necks to .0135 - cases hold .3 to .4 less than .221 - seat square into lands
Lee in OH 19.2 25 Starke CCI 400 .221 3,786 22" TC barrel
Dan C 19.2 25 Berger Rem 7.5 .223 3,800 Turn necks to .0135 - cases hold .3 to .4 less than .221 - seat square into lands
Lee in OH 19.5,c) 25 Starke CCI 400 .221 3,874 22" TC barrel - compressed load
BJS - Bryce 18.8 25 Berger CCI BR4 0.221 3,850 Mollied bullet. Hot Load. Start at 18.4 & work your way up to 18.8.
H335 POWDER CHARGE BULLET WEIGHT BULLET PRIMER BRASS VELOCITY COMMENTS
Montdoug 19.7 20 V-max Rem 7.5 .221 3,850 26" barrel - temperature sensitive
Todd Kindler 19.0 25 Berger Rem 7.5 .221 3,808
Stevespages.com 19.0 25 Berger Rem 7.5 .221
Todd Kindler 19.4 25 Berger Rem 7.5 .221 3,875 very accurate
Todd Kindler 19.8 25 Berger Rem 7.5 .221 3,909 very accurate - approach carefully
Stevespages.com 20.0 25 Berger Rem 7.5 .221
AA2015 POWDER CHARGE BULLET WEIGHT BULLET PRIMER BRASS VELOCITY COMMENTS
20
Accurate Arms 16.7 25 Berger Rem 7.5 .223 3,388 Commercial data for .221 brass - beginning charge
Accurate Arms 18.5 25 Berger Rem 7.5 .223 3,650 Commercial data for .221 brass - max.
Benchrest.com/sst/mach 18.5 25 Berger Rem 7.5 .221 3,850
AA2230 POWDER CHARGE BULLET WEIGHT BULLET PRIMER BRASS VELOCITY COMMENTS
20
Accurate Arms 18.3 25 Berger Rem 7.5 .223 3,398 Commercial data for .221 brass - beginning charge
Accurate Arms 20.3 25 Berger Rem 7.5 .223 3,861 Commercial data for .221 brass - max.
Benchrest.com/sst/mach 20.3 25 Berger Rem 7.5 .221 3,850
AA2460 POWDER CHARGE BULLET WEIGHT BULLET PRIMER BRASS VELOCITY COMMENTS
20
Accurate Arms 18.5 25 Berger Rem 7.5 .223 3,417 Commercial data for .221 brass - beginning charge
Accurate Arms 20.5 25 Berger Rem 7.5 .223 3,883 Commercial data for .221 brass - max.
AA2520 POWDER CHARGE BULLET WEIGHT BULLET PRIMER BRASS VELOCITY COMMENTS
20
Accurate Arms 18.5 25 Berger Rem 7.5 .223 3,316 Commercial data for .221 brass - beginning charge
Accurate Arms 20.5 25 Berger Rem 7.5 .223 3,768 Commercial data for .221 brass - max.