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#3762364 - 02/05/10 11:12 AM Re: Marlin/Savage Barrels Interchangeable??? [Re: bcp]
Cowboybart Offline
Campfire Ranger

Registered: 02/13/05
Posts: 2250
Loc: Wyotana
The barrels will screw in. Don't know about the bolt set up. The stocks are will not interchange.
_________________________
Some is Good---More is Better----Too Much is Just Right

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#3763030 - 02/05/10 02:01 PM Re: Marlin/Savage Barrels Interchangeable??? [Re: bcp]
bcp Offline
Campfire Guide

Registered: 03/04/05
Posts: 4359
Loc: SW WA
Measured some:

Marlin XS7 and XL7 bolt heads appear identical.
Savage 10 and 110 bolt heads are different. I don't have a 10 available.








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#3763533 - 02/05/10 04:12 PM Re: Marlin/Savage Barrels Interchangeable??? [Re: bcp]
260Remguy Offline
Campfire Kahuna

Registered: 12/18/02
Posts: 15633
Loc: NE
The question is, "How critical is a 20/1000" difference in bolt face depth?"

Jeff

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#3767123 - 02/06/10 01:23 PM Re: Marlin/Savage Barrels Interchangeable??? [Re: 260Remguy]
Bug Offline
Campfire Regular

Registered: 03/03/03
Posts: 420
Loc: East Texas
Jeff,
20/1000" in headspace is quite critical. Typical diff. between go/no go is .004".
That much stretch on a case MIGHT not be a big deal, IF you have your dies set correctly. But, there are a lot of reloaders out there that aren't that sophisticated. They are assembling ammo, not custom reloading!
In this instance, all you have to do, is face .010" off the barrel face, and you're golden.

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#3768799 - 02/06/10 09:31 PM Re: Marlin/Savage Barrels Interchangeable??? [Re: Bug]
260Remguy Offline
Campfire Kahuna

Registered: 12/18/02
Posts: 15633
Loc: NE
You think that 20/1000" is worth considering and I think that 20/1000" is worth considering, but a lot of people are screwing Savage and Savage-specs barrels onto XL/XS-7 actions and going on their merry way when they feel friction against the bolt.

I've been trying to point out to folks that different in the depth of the bolt face recess MIGHT be a problem, because the friction that they are feeling MIGHT be the back of the barrel against the front of the bolt, not the rear of the headspace gauge against the bolt face. With 20/1000" you are going to get case stretch, but how much stretch is there before the case separates? When I realized that the difference in bolt face recess might cause a false "proper" headspace feel, I trimmed my barrel back and recut the chamber.

Jeff

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#3769889 - 02/07/10 09:18 AM Re: Marlin/Savage Barrels Interchangeable??? [Re: 260Remguy]
bcp Offline
Campfire Guide

Registered: 03/04/05
Posts: 4359
Loc: SW WA
First, an apology. A corrected photo has been posted.

Using a Starrett depth micrometer, I got new measurements.

To the nearest 0.001, my two Marlins are 0.130 deep. My Savage is 0.115 deep.

I need to retire my old dial caliper. When the depth micrometer is set at 0.130, the caliper measures it at 0.140.

Safety on these barrel swaps is easy to check.

Before interchanging barrels, people need to measure cartridge protrusion from the chamber. That measurement must be greater than the bolt face depth.

Bruce

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#3770270 - 02/07/10 10:56 AM Re: Marlin/Savage Barrels Interchangeable??? [Re: bcp]
carbon12 Offline
Campfire Guide

Registered: 03/30/05
Posts: 3308
Thank you gentlemen for your detailed posts. Great thread for someone making a .308 Marlin XS7 into a switch barrel rifle. .358 Win and 6mm-.22-.250 barrels are in the queue.

My measurements of the bolt face depth of my XS7, done with a Frankford Arsenal digital caliper, came out 0.130 +/- 0.0005.

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#3771379 - 02/07/10 04:18 PM Re: Marlin/Savage Barrels Interchangeable??? [Re: bcp]
260Remguy Offline
Campfire Kahuna

Registered: 12/18/02
Posts: 15633
Loc: NE
Now the question is "how critical is 15/1000" when setting the headspace?".

Jeff

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#3777784 - 02/09/10 09:37 AM Re: Marlin/Savage Barrels Interchangeable??? [Re: 260Remguy]
HondoJohn6508 Offline
Member

Registered: 04/18/03
Posts: 122
Loc: Castell, Texas 76831
Gentlemen,

Thank you one and all for your replys and concerns on the headspace issues. .015 would be critical IMO. The difference between go & no-go gauges for the .308 family of cartridges is .006 if memory serves me correctly and .010 for the military 'field' gauge. If a bolt closes on the 'field' gauge that particular rifle is destined for the armorers "post-haste". Brass will only stretch so far before case separation.

Again..many thanks for your replys!

Ol' John
_________________________
Near the Llano River in Castell, Texas
Mark Twain was right..."There is no such thing as too much good whiskey!"

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#3779671 - 02/09/10 06:01 PM Re: Marlin/Savage Barrels Interchangeable??? [Re: HondoJohn6508]
bcp Offline
Campfire Guide

Registered: 03/04/05
Posts: 4359
Loc: SW WA
I received a new Adams & Bennett Savage barrel finish chambered for 250 Savage.

Five new Remington 250 Savage cases protrude from the barrel 0.120(2), 0.121(2), and 0.122, measured with a depth micrometer. Savage bolt faces measure about 0.115 depth, which would allow several thousandths clearance between this barrel breech and a Savage bolt nose, when this barrel is screwed in until it is tight on a case or gauge. A GO gauge should be slightly longer than a case.

Headspace measurements I have for the 250 Savage are:

(GO 1.5792)
(NO GO 1.5852) = GO + 0.006
(FIELD 1.5892) = GO + 0.010

If this barrel is screwed in until it barely touches a Marlin XS7 bolt nose, there will be about 0.008 to 0.010 free space between the case and the XS7 bolt face, which is 0.130 deep. This makes the chamber between NO GO and FIELD size, not dangerous but not good for a new barrel installation.

Note that the barrel CANNOT be screwed in until it is tight on the new case, or tight on a GO gauge. The barrel will tighten against the bolt nose first.

Bruce

PS Five new Winchester 243 cases protrude from the Marlin XS7 barrel 0.138(2), 0.139(1), 0.140(2).

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