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Goodmorning.Is there any benefit on using a ramped barrel compared to going the traditional route using a non-ramped barrel that is throated and has a polished ramp?Would a ramped barrel be more reliable for a carry gun feeding on .45ACP JHP's?I'm fairly certain I want to go the traditional route but was just curious to the advantages/dis-advantages of a ramped barrel.Thanks.

SHOKz
 

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A ramped barrel, actually a fully supported chamber, is necessarey for high pressure cartridges like the .38 Super, 9x32, .40 S&W, .45 Super/.450 SMC, etc. It is not necessary for the low pressure .45 ACP.

The .45 will generally feed better in a non-ramped configuration but I truely believe that if your gun mfg. or 'smith is competent, either should be totally reliable.
 

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I agree completely with kbear38S. Had Barsto install their ramped 10mm barrel in a Colt Delta a few years ago. What had been a totally reliable gun became a "jamamatic". Sent it back to Barsto,they rethroated the barrel,removing some of the support that the ramped barrel was supposed to provide,in an effort to get it to feed. Never did have the reliability of the factory barrel afterwards. (barrel to slide fit was mediocre and the gun was no more accurate the the stock barrel) Also had a new Para Ord Limited model with ramped barrel, also not reliable. I think anyone who puts a ramped barrel in a reliable .45 thinking they will somehow "make it better" might be real disappointed ! Best, Allen
 

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A ramped barrel in an alloy .45 frame is not a bad idea, though. However, it's not a pressure issue but, instead, a frame (feed ramp) battering issue.
 

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Ramped for anything but a 45. It's a waste on a 45 unless it's a alloy frame and even then your better off putting a steel insert in the frame. By the time you cut a ramped 45 barrel to feed as good as a non ramped you have the same case head support.

JJ
 

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I'm with all of youse. In any caliber, the more support the chamber has, the steeper the feedramp, and so the more finicky the feeding will be. Take a ramped barrel and duplicate the angles and radii of an unramped setup, and you have what is at least theoretically a better feeding situation, since there is not the 2-part surface for the round to follow up. And if you consider that the requisite gap, on an unramped setup, between the frame's ramp and the barrel throat, can be eliminated with a ramped barrel, well, that means that the lower part of the ramp on a ramped barrel can be at a slightly more advantageous angle.

I notice that Infinity is offering ramped barrels with a concave form to the ramp. This gets a slightly better angle down low where it's needed, but preserves the lower rear of the chamber-- this looks like it ought to be a good thing but I have not tried one.

I think it's mostly academic in a carry gun anyway-- I do not see a problem getting an unramped barrel to feed whatever, from Flying Ashtrays to Keith wadcutters (given good magazines). Guess you might could say that though if a bull barrel is a good thing for its added weight, a ramped bull barrel would be better since it adds a little mass to the barrel...?
 

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Originally posted by kbear38S:
A ramped barrel, actually a fully supported chamber, is necessarey for high pressure cartridges like the .38 Super, 9x32, .40 S&W, .45 Super/.450 SMC, etc. It is not necessary for the low pressure .45 ACP.

The .45 will generally feed better in a non-ramped configuration but I truely believe that if your gun mfg. or 'smith is competent, either should be totally reliable.
Sorry I have to disagree. sorry.
Check a 38 super barrel from barsto and a ramp barrel, the "unsupported one" has a little more support. funny.

On 45 I believe it is harder to get a ramped barrel to work, on 10 mm espically. (notice para does not make a 10mm? one guy got a 10mm from the st/sv factorys and had many problems also) with a ramp barrel.

If your using agressive hollow points the bottom of the bullet hits the feed ramp around .375 or .400 deep. the bottom of a ramp barrel is .300 to .310 so it does not really help with nose dives in alum. frames.

hope this helps.
geo ><>
 

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Hello George.

I agree with you regarding getting ramped 45 barrels to feed reliably.

Your post brings an interesting point to mind. I am bringing this up with all due respect and in the interest of discussion. Hope you don't mind.


You stated that it is hard to get 10mms with ramped barrels to feed well. I know for a fact that there are MANY IPSC Limited guns which are very reliable and which are built around the 40 cartrige loaded to 10mm length, approximately 1.250. Basically the same cartridge. I have spoken with and examined the guns of several top shooters whose guns are set up this way.

That seems to run counter to what you said.

I would be interested in hearing your thoughts on this.

Looking forward to your reply,
Steve

------------------
MD Labs/Mad Dog Knives
 

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Strider, most of the guys I know load 40 to around 1.200 max. I use 1.180 personally. I took a class with Todd earlier this year. One of the students had a stock 10mm STI fat gun that kept choking. Todd said he had never seen a 10mm run 100%.

[This message has been edited by PK (edited 06-16-2001).]
 

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Strider, that small amount amount of increased diameter that the longer 10mm case contributes ahead of a long loaded 40 case sometimes makes a big difference in feeding. You have to throat the hell out of a 10 to get it 100%.

JJ
 
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