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Joined: Feb 2008
Posts: 11,346 Likes: 391
Sidelock
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Sidelock
Joined: Feb 2008
Posts: 11,346 Likes: 391 |
I agree with the idea of fire forming with a 6.5 x 55 case and fast burning powder to get the the best fill out. I also agree that you shouldn't buy any headspace gauges at this point, due to the cost and the fact that they may not be what you need, and you may never use them again. Another option to see if you may have an excess headspace situation would be to cement round pieces of thin plastic shim stock of various thicknesses to your 6.5 x57 cases to see how much makes it difficult or impossible to close the bolt. It doesn't take very much to cause excess case stretching, or partial or complete head separations. At this point, it is impossible to know if you are dealing with an obscure standard chambering, a wildcat, or an over polished chamber. Here's a silly question... any chance of contacting the original owner to get some clues?
I'd still recommend slugging the bore too. And another chamber cast with very careful measurement at the correct time after casting is a good idea. You already have the materials.
A true sign of mental illness is any gun owner who would vote for an Anti-Gunner like Joe Biden.
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Joined: Jul 2012
Posts: 4,496 Likes: 211
Sidelock
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Sidelock
Joined: Jul 2012
Posts: 4,496 Likes: 211 |
If chambering a rifle for a caliber I don't have access to headspace gauges for I sometimes use a factory cartridge with one thickness of tape on the head for a go gauge and enough thicknesses to make the normal difference between the gauges for the no go( usually .003 or .006"). I usually use masking tape because it is "on hand" and easy to trim to fit the head. The same idea as Keith's, different material ( this is a "make do" solution, not the preferred one). Be sure the cases you to fire form with a European case rather than a smaller American one. Mike
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Joined: Oct 2015
Posts: 184 Likes: 1
Sidelock
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OP
Sidelock
Joined: Oct 2015
Posts: 184 Likes: 1 |
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Joined: Oct 2015
Posts: 184 Likes: 1
Sidelock
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OP
Sidelock
Joined: Oct 2015
Posts: 184 Likes: 1 |
I will try the masking tape trick first. I have some Bullseye powder on hand. How much would I need to use to fire form or to see if this case moves much? I have seen 11-11.5gr mentioned to fire form .260.
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Joined: Oct 2015
Posts: 184 Likes: 1
Sidelock
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OP
Sidelock
Joined: Oct 2015
Posts: 184 Likes: 1 |
when using the tape to check headspace do I feed from the magazine?
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Joined: Jul 2012
Posts: 4,496 Likes: 211
Sidelock
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Sidelock
Joined: Jul 2012
Posts: 4,496 Likes: 211 |
R.Marshall No, don't feed it from the magazine. It is preferable to remove the extractor( you don't have to remove the retainer, just have a scribe handy to turn it around if necessary to remove the bolt). You can slide the case under the extractor by hand, you just lose some sensitivity of feeling( the tape is somewhat compressible so don't "crush" it closed). The Bullseye load should work. Tamp a quarter sheet of toilet paper over the powder, fill the case with polishing media/corn meal/ grits/or cream of wheat and plug it with toilet paper/ foam/ wax/ etc. If it doesn't fill out the case, increase the powder. Avoid using a bullet with any significant amount of Bullseye. Mike
Last edited by Der Ami; 12/31/19 01:17 PM.
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Joined: Feb 2008
Posts: 2,025 Likes: 25
Sidelock
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Sidelock
Joined: Feb 2008
Posts: 2,025 Likes: 25 |
RM, When you fire a case-forming load, don't have the muzzle near anything you don't want damage. High velocity corn meal is more serious than it sounds.
Bill Ferguson
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Joined: Oct 2015
Posts: 184 Likes: 1
Sidelock
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OP
Sidelock
Joined: Oct 2015
Posts: 184 Likes: 1 |
well I fire formed a pcs of 6.5x55 norma brass with 11gr of Bullseye and coffee and a pcs of cotton ball for plug. The primer is slightly bulged. unfired brass in inches base .4760 shoulder .4325 bottom of neck .2950 top of neck .2930 lenght .215 60 fire formed brass in inches base .4760 shoulder .4550 bottom of neck .3080 top of neck .3025 lenght .214 95 Original cast with cerrosafe in inches after cooling base .484 shoulder .457 bottom of neck .311 top of neck .300 original drawing of cast measurement in MM after cooling and where my measurement were taken on brass also
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Joined: Oct 2015
Posts: 184 Likes: 1
Sidelock
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OP
Sidelock
Joined: Oct 2015
Posts: 184 Likes: 1 |
would it be interesting to fire form a .257 Roberts?
Last edited by R. Marshall; 12/31/19 03:16 PM.
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Joined: Oct 2015
Posts: 184 Likes: 1
Sidelock
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OP
Sidelock
Joined: Oct 2015
Posts: 184 Likes: 1 |
It seems awfully close to .257 Roberts AI going of the fire form brass but not a exact match.
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