Reloading questions for 0.50 Rimfire Remington Rolling Block Carbine

[Patrick Chadwick]

Not .32" but what we Brits used to call 32-gauge or 32-bore. The modern use of calibre-12 etc can lead to confusion. Nobody imagines (I hope) that a 12-bore shotgun has a bore diameter of 0.12".

The Cal. 32 (CIP designation) shotshell has the following nominal dimensions:
Base diameter (very important) 14.55mm -0.15 tolerance
= 0.570" -0.006" Commercial cases are usually clearly under the nominal max. diameter. So I reckon it could be a good fit.

Rim diameter (not critical, as long as extraction works) 16.10mm =0.634"

Rim thickness 1.55mm -0.35 = 0.061" -0.014"

Length: from 50.7mm (32/50) to 70mm (32/70)

I have just measured a Magtech Cal. 32 brass case. The case mouth inside diameter is 0.532"-0.534" (not quite round). A .54 minié bullet will probably cast to something like 0.535", so with a bit of luck all you will have to do is cut the case to length!

And, of course, get a centerfire block!!!