17#! Yahoo! A significant part of the CZ 527 Carbine's appeal was the "micro" action and that, when he shouldered one, it was a reasonable (not perfect) fit. If we go for anything in a true "short action," whether Rem or Savage, we might as well chamber the 6.5x47 Lapua or similar round—and that won't be fun for him for a few years.
So it seems like the CZ would be a good fit, but I don't see any boasts about accuracy for the CZ conversions. How well do they shoot? Are they on the .6 moa side or the .9 moa side? [laughing] He shoots well, but weight and recoil are still limiting.
And thank you for mentioning the PTG bolt! Much appreciated!
I'll boast about my CZ 527. When the Walther barrel was new, it was acrurate. By that I mean at 100 yards and strapped to a lead sled it shot .3-.4 inches. Using 120gr NBTs and a compressed load of BLC (2). And a cheap 36x tasco scope. The way I measured the group size was to take the outside edge to edge and subtract .26 from that. 3 magazines through one hole .6 inches total was common. Now years later the same barrel shoots maybe .75 inches and I get a flyer sometimes 1.25 inches away . Thats through a medium contour hunting barrel in a glass bedded wood stock with a 3-9 Minox scope. I'll replace the barrel when....it get worse faster than my eyesight worsens.
That is certainly worth boasting! Flyers—gotta hate 'em. Luckily we usually have lots of changeable wind swirling in our canyon, so we usually have a wind call challenge and a ready excuse for flyers (except for those short range groups). [laughing] How many rounds would you estimate between the .3 and .75?
I think I put about 4,500-5000 rounds through that little rifle. I do load higher then recommended in that rifle (as apposed to my Grendel ARs), so that could be causing some throat issues. I never thought to check how much throat the rifle had when it was new. And again I do shoot a fair amount of Swift Scirrocos though it also; and some people tell me they ruin a barrel.
Yikes! That is bad news about the Sciroccos. The Scirocco factory loads are giving us the best accuracy through our AR. :-(
I don't know who would tell you the Sciroccos ruin a barrel. I would say the opposite is true, they are a very soft jacket and take the barrel engraving quite easily. Perhaps it is thought that they ruin a barrel because the softer jacket will copper foul sooner than fully gilded alloy jackets. Some would interpret the loss of accuracy as ruining a barrel but all it needs is maintenance.
We see a degradation in accuracy as copper fouling builds. The main driver of this is carbon build up in the throat. The carbon being very hard cuts small particles of copper jacket material from the bullet which are vaporized in the hot gasses and then condense along the bore.
A regime of solvents to remove both carbon and copper is required, and in addition a polishing compound such as JB or ISSO is used to lap the throat every 250-300 rounds. This will prolong accurate barrel life by slowing throat erosion, as long as the polishing is done in a reasonable and controlled manner. Some people go to town on the polishing and over due it. Since I got a bore scope and can see the carbon and coper deposits and throat wear, the amount of polishing I do is reduced.
But to the original point, I don't think Scirocco bullets will harm a barrel, but inadequate or improper cleaning both will.
Bob
Yikes, I thought I read that one of the benefits of the workhorse .308 was an 8,000-rd barrel life. I suppose that "barrel life" depends on one's tolerance of inaccuracy. So, there needs to be 1 barrel for every 3,000 rds in the "ammo fort."
By the time one develops an accuracy load with the various powders, charges, and COALs, it is time to re-barrel and start all over—esp for cartridges like 7mm WSM (and hot 6.5 Grendel loads?).
We asked that our Grendel barrel be melonited in hopes of reduced pressures and longer barrel life. We'll see.
I couldn't find any Sciroccos, but did find 123gr AMAXs. Now for some Grendel dies.
The article indicates that the 3000 rounds life span is for barrels that start out as shooters of 1/4 moa groups at 100 yards.
.5 to 1 moa shooters get about 6000 rounds
1-2 moa barrels enjoy 10000 rounds.
Barrel lifetime in essence almost depends on the accuracy level demanded. That is, up to the point where the rifling is so badly worn that the bullet tumbles within about 50 yards.
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Nukes Wrote:17#! Yahoo! A significant part of the CZ 527 Carbine's appeal was the "micro" action and that, when he shouldered one, it was a reasonable (not perfect) fit. If we go for anything in a true "short action," whether Rem or Savage, we might as well chamber the 6.5x47 Lapua or similar round—and that won't be fun for him for a few years.
So it seems like the CZ would be a good fit, but I don't see any boasts about accuracy for the CZ conversions. How well do they shoot? Are they on the .6 moa side or the .9 moa side? [laughing] He shoots well, but weight and recoil are still limiting.
And thank you for mentioning the PTG bolt! Much appreciated!
He is mine with a light weight sporting barrel. If you go to the bottom you will see some groups. I have also done a write you about my 600y and 1000y trip to Bisley.
http://www.65grendel.com/forum/showthrea...kengrendel.
Buck2732
"You will know you are in a nuclear attack by the bright flash, loud explosion, widespread destruction, intense heat, strong winds and the rising of a mushroom cloud".
"I have no idea what weapons will be used in the next world war... but I do know that world war 4 will be fought with sticks and stones". A Einstein.
PER ARDUA
I have been keeping my eyes open for a CZ527 Varmint simply to see if the Varmint stock mitigates the high scope ring problem. So far, no joy.
