I have a Zastava 300 win mag.
So I purchased a set of Sun Optics that were supposed to fit the Zastava M70. The weaver bases included in the kit have no mention of the base#, but the rear needs to be shimmed (a lot). Like 1-2 mm (or 0.039'' - 0.078''). So I looked online to see if they actually were the proper fitment for Zastava. I then bought a 55 (it's all they had at the local store), which turns out to be what I have in the rear. So I figure the kit is 20a + 55.
The 55 base I bought is a weaver official, and it mentions on the packaging that it may require a shim.
I looked online, and the thickest shim kit from weaver is 0.012''. So I would require at least 3 shims. I think that's a bit too much, at this point it's a problem - not a shim.
So my next guess is base 45-46, like you guys are mentioning on the forum. On the weaver bases chart, all the 45-46/20a-55 need shims. Did you guys have to shim? If so, how much? What is your caliber?
See the chart here:
http://www.weaveroptics.com/mountcha...ountsChart.pdf
I am trying to get rid of the coke can shims I have, as the accuracy at 100yrds is as good as a pistol. There could be many factors (like the caliber vs Zastava's barrel profile and cheap stock), but before going into those more expensive options, let's get rid of all the home made solutions.
Did I forget something? (I did use some loctite, zeroed first with a laser, then @ 50 yrds)
Oh, and I tried a 6.5 creedmore from another shooter next to me to make sure I wasn't the problem. (I've been 10 yrs in the army and did some biathlon).
Jessy