.32 H&R to .327 Federal?
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Thread: .32 H&R to .327 Federal?

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    .32 H&R to .327 Federal?

    I have a .32-20/.32 H&R Magnum Model P Jr. I have read about Ruger Single Sixes being re-chambered to .327 Federal. The Model P Jr cylinders are slightly larger that the Single Six cylinder.

    The question is: would it be safe to re-chamber the .32 Magnum cylinder to .327 Federal?

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    Is that on a full, SAA-sized frame and cylinder? If so, my guess would be yes as there is a ton of steel surrounding the chambers, and the .327, while high pressure, is only at 5K higher pressure than the .30 Carbine. From the Wiki:

    "The .327 Federal Magnum provides performance similar to the high-velocity rifle loadings of the old .32-20 Winchester, though these velocities are achieved in a much shorter revolver barrel, thanks to a much higher pressure ceiling for the .327.[6][15] Another similar cartridge is the .30 Carbine, which has been offered in Ruger's single-action Blackhawk revolver line since 1968.[16] However, the .327 Federal Magnum has a higher maximum pressure ceiling (45,000 psi) than the .30 Carbine (40,000 psi).[7][15]
    Custom gunsmiths working with Ruger and Freedom Arms have offered conversions of single-action .32 H&R Single Six and Freedom Arms revolvers to .327 Federal. Test results from the long barreled guns showed even higher velocities than the .30 Carbine, along with excellent accuracy.[17]"
    Speaking of which, Gunblast.com and their feature on conversions would be a good source.
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    No, the frame is slightly bigger than the Ruger Single Six. It is not a full sized Single Action Army frame.

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    Here's the finest Single Action revolver I own in this really versatile chambering, the Ruger Single 7. Along with it's 22 brother the Blackbird.
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    I wouldn't try it. I own a Single Seven 327 Magnum and I have to believe there is more to the metallurgy than just the wall thickness. The 327 Magnum operates at 45,000 psi while the 32 H&R is only 15,000 psi
    Kerz likes this.

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    You could probably get satisfactory results using the 32-20.
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