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I chronoed a couple of 45ACP loads this Memorial Day (God bless the vets). The bullets are from the same alloy made by the same manufacturer.

First was a 185gr LSWC w/ 4.8 grains of Red Dot set at 1.238 OAL
20 shots averaged 854 feet/sec +/- 10feet/sec (STDEV)

Second one was a 200gr LSWC w/ 4.8 grains of Red Dot set at 1.238 OAL
20 shots averaged at 858 feet/sec +/- 10feet/sec

So basically I get the heavier bullet traveling at about the same speed (actually marginally higher) using the same powder charge. The only difference is the void volume in the case.

as an aside, a fellow shooter wanted to test his 45-70 loads while I had the Chrony set up. His fist load clocked at 1400 ft/sec, the second one - at 1700 ft/sec. (3 shots each). Both were 300 grain hollow points out of a 10 inch (?) BFR revolver. He said these were his plinking loads :crazy: :)
 

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The same powder charge in less space = higher pressure.

Also... a heavier bullet takes longer to get started moving...this also causes higher pressure.

Combine those 2 things...and thats why you got similar velocities.:smile:
 
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