doc12
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Post by doc12 on Dec 12, 2015 22:22:27 GMT -5
Planning my new build and looking at barrels. I've read about guys shooting smokeless .458 barrels. Pardon my ignorance but whats the difference between that barrel and the Pac Nor .45 barrels I've used before?
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Deleted
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Post by Deleted on Dec 12, 2015 23:00:51 GMT -5
Your pacnor is a .458 smokeless...The break action barrels on the apex,encore...etc can be smokeless 45/70 barrels or a .45 blackpowder barrel.....I'm guessing that's where your question is referring to....Pacnor ,Mcgowen,Brux,Kreiger,shilen...etc all are going to be sml barrels....
Some have experimented with a .452 bore barrel and shot .451-2 bullets full -form with very good accuracy ,but the .458 shooting a .451 275 or 300 Be smoothformed seems to be the norm at this time...
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Post by speedrackin on Dec 13, 2015 7:04:07 GMT -5
Not an expert by any means and definitely not a builder , isn't there some thin about bore size and lan to lan size , maybe the builder could explain this in much better detail ?
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Post by linebaugh on Dec 13, 2015 9:07:12 GMT -5
Doc,
I don't 100% follow your train of thought so I will make my best educated guess.
If you had a smokeless and/or other "rifle" barrel in the past in 45 caliber (generic term) it was almost certainly a .458 caliber barrel. That said there was and is likeley no difference in the pacnor you had in the past and the bulk of what you are seeing in builds on here.
A .458 rifle barrel, most any maker, with a 1:18 to 1:22 twist will be what you are looking for. This will give you at least 3 options in the projectiles you run. You can shoot saboted .40 caliber bullets, you can shoot smooth sized .450ish bullets without a sabot and you can shoot .458 bullets which are full formed.
Smooth formed is simply sizing the bullet down so that it lightly engraves the lands of the barrel. In this process the pressure generated on ignition squishes/obturates the bullet into the rifilings. Bullets will be .450-.452 when starting this process.
Full form is taking a piece of your actual barrel typically called the "drop" and running .452 or .458 caliber bullets through to actually imprint the bullet. In this case you match the land and groves up on the bullet and feed it into your barrel.
I hope that helps answer your question. I'm sure many others can do the same.
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doc12
New Member
Posts: 46
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Post by doc12 on Dec 13, 2015 9:18:59 GMT -5
Guys, I think I have it figured out. Thanks for your responses. I think it was just how people describe their .45 caliber. Majority of people just refer to their build as a .45 barrel but saw that some said they built a .458. I thought there was some small difference in the diameter of the barrel but I was wrong. It's essentially the same thing just labeled differently. Sorry about the confusion but you helped me figure it out!
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Post by linebaugh on Dec 13, 2015 10:00:26 GMT -5
Actually you are not exactly wrong. 45 caliber is a generic term.
45 rifle is another generic term to a degree but it would most likely refer to .458 bore.
There are guys that build .451-.452 rifles. This is tyoically a pistol caliber but you can full form and shoot pistol bullets or the parkers this way. In doing a gun this way you are limited to FF only and no sabots.
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Post by keith on Dec 13, 2015 10:59:05 GMT -5
I have both .451 and .458 guns.
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