10-09-2014, 05:21 PM
Bob Prudhomme Wrote:"I own a Mannlicher-Schoanauer model 1903 carbine which uses an almost identical round. I have not slugged the barrel but it is factory marked as being 6.7mm which is a diameter of .2637". This is the bore diameter, not the grove diameter. As has been correctly pointed out, all current and past 6.5mm bullets, with the exception of the Carcano ones measure .264". Steyr, the maker of my rifle, knew this yet still produced rifles with a a bore diameter of only .003" smaller. I would guess that grove diameter of my rifle is at least .268. The author of the document linked to here has identified one rifle with a groove diameter of .269"! Remember, all the available ammo used .264" bullets."
I suggest you find yourself a better coach.
I hate to keep contradicting you but, 6.7 mm (.2637") is the GROOVE diameter of a 6.5mm Mannlicher-Schoenauer rifle, not the BORE diameter. The bore diameter of a 6.5mm M-S, plus a 6.5mm Carcano, plus any other 6.5mm rifle you care to discuss is, as any fool can figure out for himself, 6.5 mm or .256"!!!
The 6.5mm Carcano has a GROOVE diameter of 6.8 mm (.268"). Despite what you have tried to tell this forum, Italian Carcano ammo bullets measure .268". If it was acceptable to shoot .264" bullets from a Carcano, why did the Italians go to all the trouble of making the unique .268" bullet?
No, .2637" is not the groove diameter of a 6.5x54 MS rifle. Look at the CiP specs I posted on the previous pst - the minimum groove diameter is .2669". The CiP is about as good as it gets on this issue as their specs are law in CiP counties - you cannot proof a rifle if it is not conformant to CiP specs and if you cannot proof it then it cannot be legally sold. On that point - one of the posters on that thread has stated that his brand new barrel has a groove diameter of .268".
You still haven't addressed the issue of the markings on my rifle. It is marked 6.7, equating to .264", you state this as being groove diameter. I posted you a link to a picture of a 6.5x54 Mannlicher stamped 6.5. If you are correct, and that the stamp refers to groove diameter then how can that be as that would mean the rifle would have a .256" groove diameter which, as we both know, is not possible.
On the subject of Italian ammo - have you measured any yet, by the way? Military ammo is military ammo. It is often of very low quality depending on prevailing circumstances. One of the links I posted to was to a discussion where a chap had actually pulled the bullets and measured them. He got .266". Italian military ammo is probably mostly junk so variations in bullet diameter would be pretty much the norm - as in much military ammo. You seem to want us to believe that the Italians essentially made junk rifles and second-rate ammo (degrading primers, etc) yet that every single batch of the bullets they produced for it consisted entirely of bullets that measured precisely .268". Sorry but I don't buy it.
Have you put your mind to addressing any of the questions I asked of you a few posts back? Here's an easy one for you go here and order some Hornady Carcano bullets. Measure them and come back and tell us all what they measure. It won't be .268".
JL.