From what I've read on their website they order the bbl'd receivers already put together, headspaced, yada-yada-yada.
.5" 1/2" @ 100yds??? Good luck with a 64 action. You'll need a factory rifle with 1 heck of a aftermarket bbl installed on it or a full blown custom rifle.
You're going to find that the only ones getting consistent 1/2" 10-shot groups @100yds are the ones with the well worn keyboards.
At the end of the day, the 64 actions are anschutz's base model/line for their rifles. They use them on their cheap hunting rifles and their match rifles for beginners/youth's. If someone could be competitive with a 64 actioned anschutz. Then why are they spending 3 times as much for anschutz's 54 actioned counterparts??? Because that's what it take to be competitive.
You should call Steve and ask him what chamber is in those rifles your looking at. Why all the questions about the chamber???
Because "HUNTING" rifles use "HUNTING" bullets and "HUNTING" bullets are typically longer (oal) than their match bullet counterparts. And guess what!!! THe cheaper grades of match ammo are longer (oal) then the better grades of match ammo.
That's why you keep hearing people say get wolk or sk+ it does excellent in this rifle or that bbl. It's because the bullets are longer and fit in the semi-match chambers better. Some people shoot highpowers with the bullet 10/1000th's of the lands. Others have the bullet 10/1000th's+ in the lands. They found that 22lrs do extremely well with the bullet 30/1000th's in the lands. You can use a .223" compareator and measure the oal of the different 22lr ammo, it's a real eye opener.
A chart showing the different chambers and the different chamber lengths/sizes.
Allot of european mfg's use a 18mm chamber in their sporting rifles. Other opt for the shorter 17mm chambers (17mm ='s .670") & 18mm chambers (.708").
As you can see the match chambers start with the lilja reamer/chamber. I use that reamer allot on sporter/hunting rifle bbl's. That chamber does extremely well with the cheaper/longer low grade match ammo.
Most of the best in the business shoot 10x, actually the eps nosed 10x. They have a chamber reamer specifically for that cartridge. As you can see it's allot shorter than the 18mm/17mm chambers.
Anyway that's why soooooo many people do well with the low grade wolf or sp+ in their bbl's. That ammo's oal matches the chambers better in the semi-match chambers in some hunting/bolt actioned rifles or the bentz chambers in the semi-auto's.
Consistent ignition
Strong receiver
tight chamber
quality stock that pillar bedded
You're looking at a rifle that has the smaller weaker bolt, a lighter/weaker receiver, has a hunting chamber with a stock that needs bedded with a hole in the receiver for a mag that makes the receiver even weaker.
If you do get 1 of the rifles you were asking about, take it easy and try to get consistent 1" groups at 100yds with it 1st. When you're able to do that don't bother trying to get 1/2" groups. Just go to the nationals at camp perry. Because if you can consistently hitting 1" targets @100yds (x-ring) you'll win the nationals.