Jacket Material for Swiss 7.5x55?

squid8286 · August 08, 2007, 16:44

What is the jacket material for the Swiss surplus 7.5x55 made of?

**Shootability** · August 08, 2007, 17:01

I think cupro nickel - tombac

squid8286 · August 08, 2007, 17:04

Quote:

Originally posted by solvability
I think cupro nickel - tombac

Thanks very much - now one last question. Is this any harder on the bore of the rifle than copper would be?

**Shootability** · August 08, 2007, 17:08

Perhaps, but my guess is an academic difference. It has an advantage - I have never had metal fouling after shooting gp11 - but my copper jacketed reloads leave a good bit of copper behind.

Have you pulled one of the bullets and looked at its shape - it is a very complex shape with very fine aerodynamic qualities ?- I wish I could get the projectiles.

**moses** · August 08, 2007, 18:20

Actually steel bullets are usually slightly softer than copper bullets, they use a really soft steel. Someone did a rockwell test on steel bullets vs copper bullets here on the files a few years ago and the steel bullets tested softer.

I have done the pocket knife test and find they usually do scratch easier than the copper bullets.

Do you really think the Swiss would use a bullet that would wear thier barrels out quicker?

ammolab · August 08, 2007, 18:25

Quote:

Originally posted by solvability
I think cupro nickel - tombac

I think you find Nickel over steel in the Swiss GP11... Don't know about Tombac..... as that is an alloy of Copper and Zinc what us Americans call Guilding metal. Have not seen Tombac on GP11

squid8286 · August 09, 2007, 05:20

I haven't pulled a bullet and taken a look - yet. Thought it was a standard boattail.

August 08, 2007, 16:44	#1
squid8286 Registered Contributor FALaholic #: 7276 Join Date: Aug 2002 Location: North Carolina Posts: 1,330	Jacket Material for Swiss 7.5x55? What is the jacket material for the Swiss surplus 7.5x55 made of?

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August 08, 2007, 17:01	#2
Shootability Formerly Solvability Bronze Contributor FALaholic #: 6448 Join Date: May 2002 Location: HSV Posts: 2,702	I think cupro nickel - tombac

August 08, 2007, 17:08	#4
Shootability Formerly Solvability Bronze Contributor FALaholic #: 6448 Join Date: May 2002 Location: HSV Posts: 2,702	Perhaps, but my guess is an academic difference. It has an advantage - I have never had metal fouling after shooting gp11 - but my copper jacketed reloads leave a good bit of copper behind. Have you pulled one of the bullets and looked at its shape - it is a very complex shape with very fine aerodynamic qualities ?- I wish I could get the projectiles.

August 08, 2007, 18:20	#5
moses One of the original 400 Contributor FALaholic #: 392 Join Date: Jul 2000 Location: charlotte nc usa Posts: 5,474	Actually steel bullets are usually slightly softer than copper bullets, they use a really soft steel. Someone did a rockwell test on steel bullets vs copper bullets here on the files a few years ago and the steel bullets tested softer. I have done the pocket knife test and find they usually do scratch easier than the copper bullets. Do you really think the Swiss would use a bullet that would wear thier barrels out quicker?

August 09, 2007, 05:20	#7
squid8286 Registered Contributor FALaholic #: 7276 Join Date: Aug 2002 Location: North Carolina Posts: 1,330	I haven't pulled a bullet and taken a look - yet. Thought it was a standard boattail.