Current production Flattop convertible 45's

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Dave Schwaab

Bearcat
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Nov 2, 2014
Messages
70
The expanding gases produced by the burning powder create the pressure that pushes the bullet down and out of the barrel, imparting the velocity to the bullet. Faster burning powders produce higher pressures quickly, while slower burning powders develop their pressure over more time. It is the PRESSURE that produces the VELOCITY, not the other way around.

A 260 gr bullet IS HEAVIER than a 230 gr bullet. I have seen "bear loads" using bullets up to 325 gr. Push all 3 bullets to the same velocity, say even 750 fps, and the heavier bullet will have the greater energy. As each bullet is pushed to faster speeds, the energy will increase faster for the heavier bullets because the velocity factor is squared in the energy equation.

We're getting away from the original question for this thread, that of what the pressure limit was for the New Model Flat Top Blackhawk with the Mid Sized Frame was. That answer would be the .45ACP +P limit (23,000psi) and NOT the .45 Colt for Ruger/Contender Only limit (25,000psi). At that pressure limit, you will still be able to get some pretty stout loads through the gun safely!
 
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PriseDeFer

Single-Sixer
Joined
Apr 22, 2014
Messages
444
SLG, do your own research on this one. My understanding is that there are 3 tiers of 45 Colt loads...14.000psi, 23,000ps[ and 30,000psi. That highest pressure load is what folks call "Ruger Only", and that means Ruger Large Frame, not the New Vaquero or new Ruger Flat Top.
 

outlaw_dogboy

Single-Sixer
Joined
Aug 2, 2005
Messages
167
Location
Maryland, USA
SLG, do your own research on this one. My understanding is that there are 3 tiers of 45 Colt loads...14.000psi, 23,000ps[ and 30,000psi. That highest pressure load is what folks call "Ruger Only", and that means Ruger Large Frame, not the New Vaquero or new Ruger Flat Top.
Not sure how CUP compares to PSI, but the Speer 13 loading manual has the "Ruger Only" heavy loads listed at 25,0000 CUP.

Based on what they have listed as the velocity out of a 7.5 inch barrel, for the 260 gr. and 300 gr. JHPs, I have to believe Buffalo Bore "Ruger Only " loads are loaded maybe heavier than 25,000 CUP. Unless BB is being quite optimistic in their velocities, or using REALLY long barrels. Their loads for those are advertised a couple-hundred fps faster than the Speer manual.
 
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Jan 10, 2005
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This is the flat top Blackhawk that is the "original" topic of this thread, just in case anybody was still wondering.
 

Ride1949

Buckeye
Joined
Dec 4, 2021
Messages
1,212
Location
Oregon
Bobby Tyler sure builds some nice guns. (There's another thread on here about one of his Bisley's) I bought one of the Lipsey's stainless .45 convertible flattops on the first run of 500. Nice gun, but nowhere near as nice as that. If I ever hit the lottery....🥲

Edit: builds some nice guns, not makes them.
 
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