For those curious how my theoretical calculations may scale...here is my formula ran for the umarex gauntlet. 50 cal, 29.5" barrel 3k psi regulated. Note: I do not know all the micro variables required to be very accurate. These are using standardized deductions for a few micro variables, these deductions are static and I do not change them...ever.
Gr (claimed) FPS FPE (predicted..) FPS FPE
180 Umarex® ARX® 1100 484 1112 494 = 98.9% accuracy on velocity
200 Lead 1055 495 1075 513 = 98.1% accuracy on velocity
250 Lead 1000 555 1004 559 = 99.6% accuracy on velocity
275 Lead 945 545 977 583 = 96.7% accuracy on velocity
300 Lead 930 576 953 606 = 97.5% accuracy on velocity
330 Lead (Lyman) 935 641 930 634 = 99.4% accuracy on velocity
350 Lead (Lyman) 875 595 916 652 (not sure why they lost power going up in weight here, likely poorly sized ammo / leakage)
550 Lead 760 700 740 668 = 97.3% accuracy on velocity.
Now I am not trying to toot my own horn, I am doing this to assure you that simple physics isn't biased to brand, it works across all platforms. The math/formula scales just fine from .177 calibers and 8 gr to .50 cal and 550 gr and beyond.
Here are some .30 cal numbers ran with a 700mm barrel, and 165 bar..provided plenum is big enough (ie 1/2 to 1 CC per fpe, may be possible with as low as 1/3..)
44.75 = 131 FPE / 1148 FPS (JSB Diablo)
46 gr = 132 FPE / 1136 FPS (Noe Molds)
50.15 = 135 FPE / 1104 FPS (JSB Diablo)
55 gr = 140 FPE / 1072 FPS (Neilson Ammo)
59 gr = 144 FPE / 1048 FPS (Noe Molds)
68 gr = 152 FPE / 1004 FPS (Noe Molds
106 gr = 179 FPE / 872 FPS (Noe Molds comes in .308 would likely need sizing but @ 872 fps should fly?)
Gr (claimed) FPS FPE (predicted..) FPS FPE
180 Umarex® ARX® 1100 484 1112 494 = 98.9% accuracy on velocity
200 Lead 1055 495 1075 513 = 98.1% accuracy on velocity
250 Lead 1000 555 1004 559 = 99.6% accuracy on velocity
275 Lead 945 545 977 583 = 96.7% accuracy on velocity
300 Lead 930 576 953 606 = 97.5% accuracy on velocity
330 Lead (Lyman) 935 641 930 634 = 99.4% accuracy on velocity
350 Lead (Lyman) 875 595 916 652 (not sure why they lost power going up in weight here, likely poorly sized ammo / leakage)
550 Lead 760 700 740 668 = 97.3% accuracy on velocity.
Now I am not trying to toot my own horn, I am doing this to assure you that simple physics isn't biased to brand, it works across all platforms. The math/formula scales just fine from .177 calibers and 8 gr to .50 cal and 550 gr and beyond.
Here are some .30 cal numbers ran with a 700mm barrel, and 165 bar..provided plenum is big enough (ie 1/2 to 1 CC per fpe, may be possible with as low as 1/3..)
44.75 = 131 FPE / 1148 FPS (JSB Diablo)
46 gr = 132 FPE / 1136 FPS (Noe Molds)
50.15 = 135 FPE / 1104 FPS (JSB Diablo)
55 gr = 140 FPE / 1072 FPS (Neilson Ammo)
59 gr = 144 FPE / 1048 FPS (Noe Molds)
68 gr = 152 FPE / 1004 FPS (Noe Molds
106 gr = 179 FPE / 872 FPS (Noe Molds comes in .308 would likely need sizing but @ 872 fps should fly?)
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