The "fbi" load and the buffalo bore load are 2 different things. The FBI used a hollow based hollow pointed swc bullet.
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The FBI kept tight control's on their revolvers cylinder gaps and this load did +/- 950fps out of their 4" bbl'd revolvers.
Buffalo bore uses a thompson style gc'd bullet.
The forster case trimmer is an excellent tool to keep around, it can do more than trim cases. It can hp bullets using a 1/16" bit for rifle, 1/8" bit for pistol. But I like to use a 3/16" 60* center drill to make huge hp's in cast/coated/plated/soft nosed jacketed bullets.
A lyman 429422 cast bullet, the 429422 is a keith style swc that has a hollow based pin. I used the forester 60* hp tool to make a hp in the hb bullet. The end result is a FBI style hollow pointed, hollow based swc.
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Enter buffalo bore's "hot 38spl load" 20a which does +/- 1000fps with that 158gr thompson bullet in snubnosed revolvers. +/-1000fps is very doable with 2400 in a snubnosed ca 44spl. These loads are in the 18,xxxpsi range
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That lyman 429422 "FBI" bullet doing the 1000fps buffalo bore velocities
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I've done a lot of testing/shooting 44cal hp's over the decades. Been thinning the herd the last couple of years selling of 4 different hp molds along with 2 sets of swaging dies that had hp nose forming dies.
Do yourself a huge favor and get a forester trimmer and then get the hp tools. Making your own hp's out of commonly sold bullets is a huge plus.
