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I got a CZ 550 in 375 H&H Magnum the other day. Brand new rifle. I decided to work some loads with it. I put a scope on it using Italian made Picatinny mounts. Point of impact was so low I ran out of scope adjustments. When this happened in the past, I used pieces of metal cut off pop cans, and they always worked. I don't remember having to use more than 3 before. Well, I did put three in and shot it. Still way too low. So I put 3 more shims. Sone nuts here were asking if it makes a difference if the shims are from normal drinks or diet ones! Still needed more, as the POI was not right with the scope. But, I discovered something new. Never happened to me before, and frankly, have no idea what is causing it. After 2-3 shots, the screws on this ring become loose!! I tighten them as much as I could. Shoot 3 rounds, and they are loose again! What the hell is causing it? I cannot tighten them any more, or I will break the heads. I have steel shims on order, and when these come I will replace the aluminum ones and see if the same occurs again!! | ||
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| one of us |
Wrong mount, wrong rings. | |||
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| Administrator |
No. Both are for this action. Could be something wrong with them. Have had to shim lots of factory rifles, but never as much as this one. | |||
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| One of Us |
Could your mounts have 10* or 20* of elevation built in? Can you reverse them? "Peace is that brief glorious moment in history when everybody stands around reloading". | |||
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Moderator |
likely the bases are of different heights #dumptrump opinions vary band of bubbas and STC hunting Club Information on Ammoguide about the416AR, 458AR, 470AR, 500AR What is an AR round? Case Drawings 416-458-470AR and 500AR. 476AR, http://www.weaponsmith.com | |||
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| Administrator |
Did not think of this, thank you. But the ones with built in elevation are normally marked. I did not look, as they came as standard. Will check tomorrow. | |||
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One of Us |
Measure the pic rail. Check if maybe it is a little narrow in the front. Maybe fix it by laying a strip of can across the pic rail and folding it to fit before mounting the ring bottom half. | |||
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One of Us |
Do they make 1 piece Picatinny MOA rails for the CZ . Like clowdis said. Maybe they shipped you an MOA long range Piccy. | |||
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One of Us |
I had a CZ Rigby that wouldn't zero the scope for elevation. I pulled the barrel off and machined a barrel stub to hold in the mill vise. indicated the stub level and put the rings on with a ground 18" x 1" bar. In 12" of travel the bar was .136" out of parallel with the barrel stub in the vise. JUNK | |||
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One of Us |
Action face is not square.you’ve got a drooping barrel. Prescribe viagra to give it some lift. | |||
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| One of Us |
it's more than just the face | |||
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One of Us |
The shortest book in world is Italian war heroes, so it stands to reason we are not good with rifles or their accessories. The base was probably designed for shooting fleeing Italian soldiers in the legs.  Mike Never under estimate the internet community's ability to reply to your post with their personal rant about their tangentially related, single occurrence issue.  What I have learned on AR, since 2001: 1. The proper answer to: Where is the best place in town to get a steak dinner? is…You should go to Mel's Diner and get the fried chicken. 2. Big game animals can tell the difference between .015 of an inch in diameter, 15 grains of bullet weight, and 150 fps. 3. There is a difference in the performance of two identical projectiles launched at the same velocity if they came from different cartridges. 4. While a double rifle is the perfect DGR, every 375HH bolt gun needs to be modified to carry at least 5 down. 5. While a floor plate and detachable box magazine both use a mechanical latch, only the floor plate latch is reliable. Disregard the fact that every modern military rifle uses a detachable box magazine. 6. The Remington 700 is unreliable regardless of the fact it is the basis of the USMC M40 sniper rifle for 40+ years with no changes to the receiver or extractor and is the choice of more military and law enforcement sniper units than any other rifle. 7. PF actions are not suitable for a DGR and it is irrelevant that the M1, M14, M16, & AK47 which were designed for hunting men that can shoot back are all PF actions. 8. 95 deg F in Africa is different than 95 deg F in TX or CA and that is why you must worry about ammunition temperature in Africa (even though most safaris take place in winter) but not in TX or in CA. 9. The size of a ding in a gun's finish doesn't matter, what matters is whether it’s a safe ding or not. 10. 1 in a row is a trend, 2 in a row is statistically significant, and 3 in a row is an irrefutable fact. 11. Never buy a WSM or RCM cartridge for a safari rifle or your go to rifle in the USA because if they lose your ammo you can't find replacement ammo but don't worry 280 Rem, 338-06, 35 Whelen, and all Weatherby cartridges abound in Africa and back country stores. 12. A well hit animal can run 75 yds. in the open and suddenly drop with no initial blood trail, but the one I shot from 200 yds. away that ran 10 yds. and disappeared into a thicket and was not found was lost because the bullet penciled thru. I am 100% certain of this even though I have no physical evidence. 13. A 300 Win Mag is a 500 yard elk cartridge but a 308 Win is not a 300 yard elk cartridge even though the same bullet is travelling at the same velocity at those respective distances. | |||
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| Administrator |
Problem fixed. By changing mounts. I had to give up, after so many attempts at putting different shims in. The difference was so big it was really not feasible. I removed the Italian made Picatinny bases and rings and replaced them with German made EWE mounts. Worked first time without any shims! | |||
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| one of us |
I was given the wrong set of rings for my first NO.1 had the same trouble. | |||
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| Administrator |
We put this rifle to good use yesterday. Several companies bring old, replaced hard drives, to be destroyed. I remember years ago one company advertising a hard drive with a bullet hole in it claiming they recover the data. Bullshit of course. So set the drives in the tunnel, 5 deep, and blasted them with 300 grain Walterhog bullets driven by 75 grains of W760. Velocity is about 2470 FPS. We could have had them more than 5 deep, but everyone wanted to kill some!  | |||
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One of Us |
We've got two Motorola cheapo cell phones that costed us lots of time and money in an effort to get a good signal from our house, only 1/2 mile from a major rooftop tower. Blamed the poor service on T-mobile. Bought and installed/through ceiling-wired a $400 signal booster complete with antennae to which I mounted to a ten foot pole on the peak of the roof. Barely made a difference. Say what! Finally bought Google PIXEL 3 and tried it. Wonderful. It was the piece of dump phones all along. Imagine that. From Motorola no less. Gonna make some dandy targets. Maybe a U.S. flag on the pole. Life itself is a gift. Live it up if you can. | |||
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