Reeder Custom Guns - Huey 250GNR FPS from 5" Hellcat

Sierra 75gr hp and the Speer hot core 75gr SPFN run just under 1100fps with 11.2 gr of AA-1680

The Hornady 60gr to run 1250fps with 12.5 gr of aa-1680

I thing they will go 1300fps with another half grain of powder and the case still not drag the fence from starting to back out.
Every gun is different as we all know. I thing the smaller everything is from the round itself and the little Hellcat, the more a slight change makes. All rounds where loaded with CCI mag small pistol primers. That Hornady may become the load for My Hellcat. I have a G2 barrel coming in 250GNR, I think W296 will be the powder for it. The Single six gun may handle a tad more!?! For myself I am super happy with the Hellcat. Note this new chronograph seams a bit slow compared to my last one, like 100fps, so it's worth what ever it's worth. FPS should always be taken with a small Siberian salt mine anyway

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Those little bores need some bore to burn the powder. More so than a large bore. Must be the volume of the bore or something.

I saw an unusual drop in my high capacity single shot small bores, .22-250AI and .17 Remington, compared to a rifle with 10" more tube. Ditto the 16" .22 K-hornet and 6" .224 K-Chuk revovler, with almost the same load.

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in micro-seconds and that allows for more powder burn.

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Would push the 60 grn Hornady to 1550-1600 from a 7.5" Single Six frame gun.

Would be a nice small game gun for sure.

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There is a bigger jump in the .25 bore from single shot 10" to 7.5" revolver, more so than say a .429. But you can't make it a cannon anyway. It's fast than a .22 WMR easily with twice the bullet.

The 80 gr. FNGC is my favorite bullet but the Speer 75 gr. JSP is a close second when I can find it. Like GNR said the more weight the more efficient the burn. I have a mould for the 65 gr. Lyman FNGC and the late 60 gr. Jackrabbit mould, but have not made the latter yet.

My .22 WMR SA will launch a 40 gr. at 1375 fps, the .255 Banshee will beat that easily with a 80 gr. from my 7.5". Many loads about 1600 fps. From a 10" TC it's closer to 2,000 fps.

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Huey 250GNR FPS from 5" Hellcat

Blake, great information. Thanks much!...

I think longer barrels and sealed breach add a bunch

the heavier bullets have a longer barrel dwell time

My experience similar to WBs. I suspect the 250 GNR...

The .255 Banshee does that easily, about same powder charge.

It will definitely ventilate a hog.