Rebore /swamp weight savings?

[TerryK]

I tried a search and looked back a few pages, but I could not find numbers for weight with relationship to diameter.
So I think it would be nice if someone could provide numbers like weight per inch going from 54 to 58, or 50 to 54, etc.
In that same line of weight savings, does anyone swamp a straight barrel, or is that a can of worms as far as fitting to existing stock?
Thanks.

 

[tnlonghunter]

I asked the same question once about fitting a swamped barrel to my straight barreled stock, which would essentially be the same concept as swamping a straight barrel. As far as the stock goes, you'd wind up with big gaps in the middle of the barrel channel. To close them, you'd have to fill it with glass bedding or some similar compound, and it would look ugly.

As far as weight savings by increasing bore size, I suspect there may be too many variables for it to be done with great accuracy. Different barrel profiles and steel alloys will have different weights. The amount of metal removed might even vary depending on who is doing it, how deep they cut the rifling, how many grooves, etc.

I will say this: I had a straight (15/16" diameter, 38" long) .50 barrel rebored to .54. I tried to do the math before hand by calculating from Green Mountain company's stated specs. At most, it would have only saved a half-pound. When done, I'm not sure it even did that, but it did move the balance point back a bit. I would definitely do it again, but one because it improved balance (a bit) and accuracy (a good bit), not because it feels much lighter.

 

[hanshi]

I had a "B" wgt. .40 barrel bored out to .45. As a .40 the weight was just a bit over 8 lbs. After the re-bore the wgt. had come down to 7lbs- 11oz for a savings of right around 6oz.

 

[DuncNZ]

. I just looked in a Track of the Wolf catalogue and they give different weights for different calibers for the barrels they sell , for example their 37" Colerain barrel is .45= 6.0 lb .50=5.60 lb , .54 = 5.20 lb , .58= 5.00 lb, .62= 4.50 lb This a swamped barrel , each of the same profile but different twist
So going from .45-.50 and from .50-.54 you loose ,6.4 oz each time . Going from .54- .58 3.2 oz and from .58- .62 8oz , so from .45 - 62 the loss is 1lb 8oz .
Green mountain straight barrel made as a drop in replacement for TC 32" x 1" barrels .50= 6.6 lb , .54=6.40lb , 58 = 6.20lb : that is 0.2 lb per change which by my reckoning is 3.2 oz per caliber
I live in a metric world so the weights are correct as long as my conversion from point lb to oz is correct

 

[Nor'Easter]

Barrel Weight Calculator
If you go to Colerain's or Rice's websites they give the dimensions for A-D wt swamped and octagon - to - round at each transition point. Then enter each section as a barrel into the calculator, and add the sections up. Gets you pretty close. It will make sense when you have the calculator and barrel profile info in front of you.

 

[necchi]

Good answers so far as where to look for weight comparison.

In that same line of weight savings, does anyone swamp a straight barrel, or is that a can of worms as far as fitting to existing stock?

No, cutting a current straight barrel into a swamp, either by hand or milling,, while possible,, will have an extremely cost overburden.