CZ 455 hmr wow!!!

Cass

nedcbr6 wrote: »

And Ur were saying not too much extra wght ??

The rifle is a little weighty regardless of barrel length. The heavy barrel, laminate stock coupled with a scope makes them a little heavy.

The difference between the barrels is better described in terms of balance. While the additional 4" of barrel can add some weight (at a guess just over 1/2 pound) the issue is that extra 1/2 lb further out from the balance point (fulcrum if you will) of the rifle makes it somewhat nose heavy. The mod adds so little in terms of weight that it's almost unnoticeable.

I went for the 20" primarily because it was what was in stock, i'm not fussed about 20" or 16", and from a personal point of view the 20" would provide better stability for the bullet as it can complete 2 full revolutions in the 20" barrel whereas the 16" would not allow. Now there is no ballistic reasoning or even proof that one is better or worse than the other especially given that one is 2.25 revolutions and the other 1.85. It is just personal choice again.

Lastly, and while not a huge factor in terms of buying there is a long standing issue among shooters, and shooting forums regarding barrel length. To shorten a barrel below 20" is illegal. To buy one with a shorter barrel than 20" is a grey area as technically it's illegal, but not if you have authorisation which your license stands as. So while not a primary reason it was always in the back of my mind that if circumstances change in terms of the law then my rifle is legit regardless.

German pointer

Cass wrote: »

Cannot give you a definitive answer as i treat the ,17 differently to my other rifles.

I clean the mod quite frequently. Say every 35 - 50 rounds as it's easy done. The barrel however i leave for some time. Perhaps every 150 - 200 rounds. The rifle shoots more consistent and, to me, better when dirty so i don't clean frequently. However if i leave it up for some time without use i'll clean or if using more frequently i'll clean a little more regularly.

The bullets are copper coated/jacketed, unlike .22lr which are simply lead. So a quick clean with a lead & copper cleanser sorts her out. When i do it's usually 5-10 rounds before she is back tack driving although it's never that far off from spot on even directly after the clean.

It's all about personal choice. Some may clean more often, others almost never. unless it's over a prolonged amount of time i see no reason to clean unless it's loosing accuracy due to excessive fouling.

Thanks for that I spoke to my the supers office on Friday and was assured that I'd have my license this week. Only 4 months for a sub from .22 to .17hmr

ronn

My mod is made by this company. Www.ouluntyostokeskus.com
Anyone ever herd of them or used there mods,

garv123

ronn wrote: »

My mod is made by this company. Www.ouluntyostokeskus.com
Anyone ever herd of them or used there mods,

Looking around they make the SAK? is that the one you have? if so its probably the most common rimfire mod on the market because of its price and effectiveness.

ronn

garv123 wrote: »

Looking around they make the SAK? is that the one you have? if so its probably the most common rimfire mod on the market because of its price and effectiveness.

Yeah garv that's what I have, doesn't say sak on it only has the web address I posted earlier.

They've a you tube link to taking the mod apart, looks like it's a solid piece of metal, my last mod had loads of little rings inside it.

What do you do to clean yr mod, I was thinking a rub of a toothbrush and no oil.???

Feisar

Cass wrote: »

Interesting.

Would explain why there is so little difference between them, yet there is a difference.

Different lot numbers/production runs could be the reason for this. Sure same applies to the same brand though.

Cass

I know from reloading for F-Class that almost imperceivable differences in neck tension, seating depths, propellant lots, priming, etc. can cause shifts in point of impact and overall performance of the bullet.

For example while testing ammo i found that 5/1000th of an inch difference in seating a bullet can cause a bullet to spread from 2.375" out to 19". So if 0.127 mm of difference in seating depth can cause that when i'm taking painstaking care to make sure it doesn't happen what would it be like on a conveyor belt or in an automated assembly line? I know that's a large difference in reloading terms, but the point is valid.

I realise they have quality control, etc. but another item, and one i believe could be the cause, is the different lots of propellant used. Some of the top shooters in reloading test their load/batch of propellant every time they use a fresh tub. Even though it could be the same batch or lot number they don't take the "risk" that the propellant will act the exact same as the previous tub. Some of the really anal guys i've read about even allow for the fumes from the propellant. With some allowing the propellant to sit in the case for a time to allow these "fumes" to escape while others seat the bullet immediately to trap these fumes.

I never got into it in that extreme and frankly i don't know enough about that side of it to say if it was a wind up, serious/not serious, warranted etc. The point being just because some ammo may be manufactured in the same location does not guarantee the same performance.

German pointer

O yes she is accurate. I was out this evening to zero it just before dark and put up a target at 30 yards I had bore sighted (that hole is small) it at home and was only a few clicks off in the 1 o'clock direction so dialed it in and was grouping well. Fine tuned it and Didn't have time to get it to 100 so I said to myself I'll see how they group around the screw holding the cross piece of the target. Only got one shot as the first one blew away the screw and the target collapsed. And that's only after 25 rounds I wonder what she'll be like after 2 or 300 rounds down the barrel.

Can't wait to get this into the field for a few bunnies.

garv123

German pointer wrote: »

O yes she is accurate. I was out this evening to zero it just before dark and put up a target at 30 yards I had bore sighted (that hole is small) it at home and was only a few clicks off in the 1 o'clock direction so dialed it in and was grouping well. Fine tuned it and Didn't have time to get it to 100 so I said to myself I'll see how they group around the screw holding the cross piece of the target. Only got one shot as the first one blew away the screw and the target collapsed. And that's only after 25 rounds I wonder what she'll be like after 2 or 300 rounds down the barrel.

Can't wait to get this into the field for a few bunnies.

All of the hmr's are very accurate if the guy behind the gun does his part right (I dont:D) I was very suprised how my Marlin, which woudn't be expensive at all, was very accurate and could shoot half inch groups at 100 yards.

One day after zeroing I was seeing how it would group, a blue bottle landed on the paper and I decided to see how I'd to, I fired at him and didn't see anything, until I went up to the target and here's the result.



the hole is the one on the left, you can see the wing stuck to the page and guts around the hole aren't very visible.