Michael Zeleny (larvatus) wrote,
Michael Zeleny
larvatus

how tight are your charge holes?

A few words on another aspect of close clearances. Tight chambers yield better accuracy. Given that revolvers are no longer used for combat, there is no reason to build them with clearances required for reliable operation in the dirt, which would degrade their accuracy. As Bill Jordan put it, “Speed is fine but accuracy is final.” I never had any problems in chambering, cycling, or ejecting good quality ammo in the Korth or Manurhin revolvers. There is only one legitimate reason to make handloads that cannot be chambered in them, and that is to use heavier bullets that cannot be seated deeply enough for the loaded round to fit inside their chambers. You would then be limited to the models endowed with longer cylinders. Otherwise, if you resize and trim the fired brass to the SAAMI spec, it’s all good.

I have used Meyer minus gages to measure the chambers of two representative French and German revolvers, along with their American counterparts. On a 4" MR73 Police and Defense number C37705, the .382" gage enters only at the mouth, whereas the .381" gage goes all the way in. On a 6" Korth Sport number 32126, the first gage to enter the throat is sized .382", whereas the first gage to go all the way in is sized .379". By contrast, on a 6" S&W Registered Magnum numbered 50138, registration 1829, the first gage to enter the throat is sized .383", whereas the first gage to go all the way in is sized .380". Lastly, in a Colt Python numbered 2894, the first gage to enter the throat is sized .382", whereas the first gage to go all the way in is sized .379", though the one sized .380" makes it almost all the way in. I think the previous owner was more fond of firing .38 Special than .357 Magnum.

I am collecting these critical measurements for an ongoing study, meant to correlate them with shooting performance. Tighter chambers should yield better mechanical accuracy, up to a point. Whether or not that can be demonstrated in practice, remains to be seen.
Tags: colt, guns, korth, manurhin, mr73, s&w
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