Thanks Bryan -
that is absolutely fascinating because it avoids all the "arguments" and gets right down to testing the question!
makes one wonder..
yhs
prof marvel
It does indeed. These things continue to bust certain myths. When I tested 6.5gr and 9.3gr of Trail Boss with only a 200gr lead bullet.....first let me say these bullets were the popular hard cast ACME "Magma" design much like the Laser Cast, the "Desperado", and the "Cowboy" that so may CAS shooters use. I sized mine to .429 and shot them through the PressureTrace II strain gauge system and recorded the following
1 1/4" diameter MGM barrel with .429" bore and 1:20" twist
Starlin Brass
CCI-300 Primers
200gr ACME of the Magma Engineering design
10 shot avg. each
Test #12 - 6.4gr @ 7,224 psi at only 1,000 fps
Test #19 - 9.3gr @ 15,182 psi at only 1,250 fpsMost if not all "Cowboy" factory loads barely hit 1,000fps from a rifle.
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On a side note!!!
Test #1 - Buffalo Bore "Heavy" se to 11,300 psi (SAAMI MPLM) as my "Control"
Test #1A - Magtech 976 fps @ 6,000 psi (6,000 psi is rock bottom in order to make a reading on the gauge)
Test #2 - Winchester Super-X Hunting, 1,025 fps @ 6,6594 psi
Test #3 - Winchester Super-X Hunting, 1,025 fps @ 6,762 psi
I never did test Winchester Cowboy Loads
Test #15 - 10gr Unique, 200gr ACME Magma 1,419 fps @ 14,007 psi (John Taffin load from Guns Magazine 2005)
Test #26 - 10.5gr Unique, 200gr Speer SJHP, 14,753 psi [maybe 18,000 cup] (Lyman 49th max load Group II, 1,282fps @ 19,600 cup)
Test #28 -18.5gr IMR4227, 200gr Speer SJHP, 1,097fps @ 9,205 psi (Lyman 49th max load Group I @ 11,600 cup)
Test #29 - 10.5gr Unique 205gr 427098, 1,469fps @ 17,837 psi [21,500 cup](Lyman 49th max load Group II 19,700 cup)
Test #37 - 26.5gr Reloder 7, 210gr 427098, 1,432fps @ 11,373psi
Test #43 - 40gr/W Swiss FFg, 210gr 427098, 1,337fps @ 14,285psi (Original pre-1884 unheadstamped cases)
Test #47 - 26.5gr Reloder 7, 217gr 43-215C, 13,048psi (no chrono)
Test #53 - 40gr/W Goex FFFg, 210gr 427098, 1,272fps @ 11,001psi (WLP's WRA semi-balloonhead cases)
Test #54 - 40gr/W Goex FFFg, 210gr 427098, 1,248fps @ 10,037 psi (WLP's REM-UMC semi-balloonhead cases)
Test #55 - 40gr/W Goex FFFg, 210gr 43-210B, 1,235fps @ 8,305 psi
Test #71 - 40gr/W Goex FFFg, 210gr 427098, 1,356fps @ 12,649 psi (small and large primer WESTRN semi-balloonhead cases)
All 84 tests can be seen here:
https://docs.google.com/spreadsheets/d/1cZyKKXVyHq9as9uFJiko5yReJ9a-ER32YsENTgJGJs4/edit#gid=651705900 Make sure to click each "powder" tab at the bottom.My "GO TO" loads are here, with a powder test "flow chart" that lead to my "go to" load choices.https://drive.google.com/file/d/1L4CrfgL59_4nBSq-FzUgyMuCc_oylycZ/view?ths=true