Slugging a polygonal barrel?

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ImNrml

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I have a surplus vz. 82 for which I would like to reload. I've read online that it is a good idea to slug the barrel of milsurp guns to make sure the correct bullet diameter is used. I have two questions.

First, is this necessary in a (relatively) new gun like the vz. 82? The references I found were for older battle rifles. I wondered if what was being checked was the manufacturing precision or bore wear.

Second, what would I measure in a polygonal barrel slug? Eyeballing the bore there is some variation but it's pretty subtle.

Thanks.
 
If I have to, yes, though I'm not ready to get into casting yet. Supplies of Makarov bullets seem to be thin.

I thought it would also be a good way to measure the condition of the barrel.
 
ImNrml,

Being that the CZ-82's polygonal barrel has a chrome lined bore, firing a relatively low intensity round, and most likely not all that many rounds, anything approaching any detrimental wear is extremely unlikely. I agree and do slug many barrels I use cast bullets in, and size bullets I cast accordingly. Unfortunately, unless you have a custom sizer made, or can have a commercial maker do custom sizing, you are going to be stuck pretty much with .365" being the diameter most commercial casters use for bullets intended for 9x18 Makarov.


I wanted to cast for my CZ-82 like I do for all of my other guns, but after recently receiving two defective Lee molds, I gave up. Both molds were out of round by .003", measuring .366" on the thin side, .369" on the fat side. Bullets look absolutely perfect; no frosting, have very sharp, perfectly aligned grooves, and almost invisible part lines. Even tried several alloys, but the results remained the same. Had the molds been a uniform .3665", even .367" all would have been well, but as cast both “fat” sides bullets would hang up in the throat/leade at any practical OAL. Lee does not offer a sizer anywhere near close enough to use if I wanted to even try and salvage the bullets I cast, and if I wanted a sizer from Lee it would have been a custom made one at the tune of $35, or have it made from other folks for a bit less.

I hope if you are planning on buying the Lee mold that you get one that works as cast in your particular CZ-82. Interesting to note that for decades, Lee touted and warranted their molds to cast within .001" of round, which my first Lee mold I bought in 1983 continues to do. Now they have dropped this claim from their site and advertising, and from what I have read, supposedly straight from a Lee CS person because of a change in how molds are produced. For now, I decided to go with buying 93 grain commercial cast bullets sized .365", and recently received some from Mastercastbullets.com:

600_mastercast_web_site_300.jpg

http://mastercastbullets.com/productpricelist.html

They are made from the same Magma Engineering molds about everyone else uses, and priced an extremely reasonable $40 per thousand; with shipping and insurance totaling $47 shipped to my door... Best deal I have found anywhere by far. FWIW, I have had good results with regard to accuracy and expansion so far loading 95 grain Hornady XTP-HP jacketed bullets in my CZ-82, and am greatly looking forward to seeing how these cast Mak bullets do with a wide range of propellants when tested... I have feeling my CZ82 is going to love them, going by the high quality of the product observed prior to loading.

Good luck.

P.S. You might seriously consider swapping out the recoil spring if not done already as cheap insurance. It's always the first thing I do with a used pistol, and Wolff has several different weight ratings to choose from. I bought their 3 spring calibration pack, and currently have the slightly higher than original 16 lb weight installed.
 
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