Purchased a new in box 455 in 17 hmr and accuracy is pretty disappointing. Gave it a good cleaning, mounted a scope and went to town. 5 shot groups in the 1.5 to 2 inch range at 100 yards. Put a pen spring in the trigger to get it down to 3.5 lbs which is acceptable. Backed off the action screws and started at ten inch lbs. Tried at different torque up to 25 inch lbs. Groups improved some, but, still averaging 1.5. Not very accurate for what I want. No it's not me. Shot the wife's Marlin 17 and can hold an inch or less. Shot 4 5 shot groups with my Savage and it's favorite load and all were 3/4 or less. No I can't always shoot that well, but, on that day I was. Any suggestions? Don't want to rebarrel. The price I paid for , on closeout, rather trade or sell if accuracy doesn't improve.
CZ 455 17 hmr. How to improve accuracy
- Thread starter stringnut
- Start date
- Status
VoodooMountain
Member
For any rifle that isn't grouping well for me I ways check the following:
Base, rings, scope
Change ammo
Check how receiver fits into stock
Barrel contact
Bolt/ lug engagement
Condition of bore
Condition of crown
Action screws
It seems you have ruled some of these out already.
1.5" does seem excessive for a 17 hmr. Let alone for a cz that has such a good reputation.
Base, rings, scope
Change ammo
Check how receiver fits into stock
Barrel contact
Bolt/ lug engagement
Condition of bore
Condition of crown
Action screws
It seems you have ruled some of these out already.
1.5" does seem excessive for a 17 hmr. Let alone for a cz that has such a good reputation.
Llama Bob
member
- Joined
- Feb 25, 2016
- Messages
- 2,258
My CZ 455 was in .22LR, but I ultimately found two major issues that had to be corrected:
1) the stock was too flexible for accurate shooting. A Manners replacement stock was drop-in and worked very well.
2) there was a tool mark in front of the chamber that collected lead and caused first round fliers when the lead was cold/hard.
I would start by looking very closely at your stock.
1) the stock was too flexible for accurate shooting. A Manners replacement stock was drop-in and worked very well.
2) there was a tool mark in front of the chamber that collected lead and caused first round fliers when the lead was cold/hard.
I would start by looking very closely at your stock.
Do have to check the crown and the bedding. Didn't think about either of those. Scope is proven and bases are good and tight and are in line. I never test a new rifle with a new scope. Seen a few bad ones right from the factory. The wife had a 22 second was about sell until see checked the parallax. I have no idea what it was adjusted for, but , it sure wasn't 50 yards. Is there a good way to check to see if the bolt lugs are Seating properly?
VoodooMountain
Member
On a centerfire you can use a sharpie on the back of the lugs.
I've never tried on a rimfire but the principle is the same . Truthfully, it is usually one of the last things I check.
I had a howa once that only contacted on one lug and that method is how I found out.
Currently, I have a rar that is ROUGH. Upon inspection the bolt handle is rubbing on the receiver to the point a large burr has formed at the bottom.
I've never tried on a rimfire but the principle is the same . Truthfully, it is usually one of the last things I check.
I had a howa once that only contacted on one lug and that method is how I found out.
Currently, I have a rar that is ROUGH. Upon inspection the bolt handle is rubbing on the receiver to the point a large burr has formed at the bottom.
marksman13
Member
Change ammo. Shoot a variety of stuff through it. 17 HMRs are notoriously finicky about ammo.
- Status
