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Old 01-05-2020, 01:18 AM
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Centerfire Bolt Pictures/Description



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Hey there, I've got a left hand CZ 452 in 17 HMR coming that I will be converting to a centerfire cartridge that I'm developing. The custom CNC'd brass should be here before the end of the month and so I'm trying to gather ideas on how to convert the bolt to centerfire.

The forward portion of the 591/592 bolt looks similar enough, so I thought this would be a good place to start. Can anyone provide pictures of a centerfire bolt and/or how exactly it's different from the rimfire bolt and firing pin? Thanks!
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Old 01-08-2020, 08:02 AM
Tgilmer
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Bolt mods

I don't have one, but my dad does. As I remember it, his 591 was modified by a gunsmith. The firing pin was a blade style. The gunsmith had to cut the firing pin slot deeper. The new firing pin has 2 heads and the gun will now fire center fire and rimfire rounds.
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Old 01-08-2020, 12:00 PM
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Hmmm that's interesting, any possibility you or your dad could get some pictures? I think I have it envisioned correctly but trying to mentally compare the bolt on my 592 from 10 plus years ago to the CZ is proving difficult.
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Old 01-09-2020, 07:38 AM
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Bolt

Dad is 81 and doesn't use a smart phone. He lives 200 miles from me. The next time I get down there I'll see what I can do.
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Old 01-09-2020, 11:30 AM
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That would be great, in the mean time I'll keep searching.
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Old 01-09-2020, 07:56 PM
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James Calhoon -of Bullet Fame- had a step-by-step directions at one time to convert the bolt to CF.
I had a copy but have not been able to locate it

Good Luck

Jim
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Old 01-09-2020, 11:39 PM
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So after finding an exploded diagram of the Remington bolt I realized the method used isn't going to work. It looks like my best bet is going to be to drill a new firing pin channel and machine a plug occupy the old channel. It's going to be a tight fit.
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Old 01-09-2020, 11:57 PM
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Why not go with a 527 American?
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Old 01-10-2020, 06:37 PM
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My philosophy is that if the action is going to be any bigger than a WMR/HMR I might as well use an existing cartridge like the 22 Hornet, etc. I want to try and expand on the utility of these sized firearms, if that makes sense.
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Old 01-11-2020, 10:22 AM
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591

I actually bought a doner 591m to convert to 17wsm. I just never got it started. Just remember that the 5mm rem and 17 wsm run higher pressure than other rf rounds. So be careful! People have been using the 580/581 Remmy actions converted to cf for years. A lot of them hornet and fireball builds. I have a good shooting BMAG. But I hate the action, bolt, stock, safety, and trigger. Now that RIMX is going to be making a 700 footprint WSM I see no need to modify an action. I'll buy an action from them to build around. I've also bought 2 17 hornets which makes me wonder why I would ever need a wsm.
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Old 01-11-2020, 11:23 AM
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Definitely going to have to tread carefully. I want the brass itself to be capable to handling higher pressures than I plan with the 452 so that it can be hopped up in stronger actions.

I think the 452 is pretty strong, at least as rimfire actions go; 2 decent sized lugs, threaded in barrel, etc.
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