Thread: 17hmr

Originally Posted by Shearer

17gn 17cal projectile has a lot smaller surface area for the wind to act on too. Funny that the myth about excessive drift persists.

Well... if you figure out approximate flight time then the amount of drift per second the 22lr is actually the best. i.e. if you looked purely at drift over an equal flight time in The 40gr 22WMR is worst and the 17hmr comes 3rd. For a 1 second flight the 17hmr is going to drift 45% more than the 22lr. So technically speaking the 17 does drift excessively, but that is mitigated by less flight time.

Originally Posted by vulcannz

Well... if you figure out approximate flight time then the amount of drift per second the 22lr is actually the best. i.e. if you looked purely at drift over an equal flight time in The 40gr 22WMR is worst and the 17hmr comes 3rd. For a 1 second flight the 17hmr is going to drift 45% more than the 22lr. So technically speaking the 17 does drift excessively, but that is mitigated by less flight time.

So it drifts less between the muzzle and the target?

Had a chance to put a few on paper while I was sighting in a trijicon on the 222.
Steyr zephyr , 19 inch barrel, cci vmax @100 yds. I thought 20 rds but 19 recorded on the labradar so either it missed one or I short loaded a mag at some stage. There was a little to much air movement but it is representative of conditions Id shoot in and fair for this shooter rifle combination on the day and is what id expect generally. The velocity es is pretty good on average with 3 outliers, one highish and two low. Are there worse still in the box? possibly.

Originally Posted by sneeze

Had a chance to put a few on paper while I was sighting in a trijicon on the 222.
Steyr zephyr , 19 inch barrel, cci vmax @100 yds. I thought 20 rds but 19 recorded on the labradar so either it missed one or I short loaded a mag at some stage. There was a little to much air movement but it is representative of conditions Id shoot in and fair for this shooter rifle combination on the day and is what id expect generally. The velocity es is pretty good on average with 3 outliers, one highish and two low. Are there worse still in the box? possibly. Attachment 273836

Thanks for that - looks pretty similar to my results I reckon. Is that SD 5.7 or 57? 5.7 would be exceptionally good !

With the 17gr Vmax my SD was 38

Interesting results with the .17 in this thread. It mirrors the 20-30 shot groups I get with my 22 magnum - and we were always told that 17hmr is more accurate.

Originally Posted by Beavis

Interesting results with the .17 in this thread. It mirrors the 20-30 shot groups I get with my 22 magnum - and we were always told that 17hmr is more accurate.

The .17 is just a ramset case with a bullet pushed into it so you cant expect too much

Originally Posted by Beavis

Interesting results with the .17 in this thread. It mirrors the 20-30 shot groups I get with my 22 magnum - and we were always told that 17hmr is more accurate.

We get told a lot of things that aren't supported by evidence...


This thread is informative as is the 50 at 200 version

https://www.rimfirecentral.com/threa...t-100.1204943/

Originally Posted by gimp

We get told a lot of things that aren't supported by facts...


This thread is informative as is the 50 at 200 version

https://www.rimfirecentral.com/threa...t-100.1204943/

That's a brilliant resource, thanks for sharing.

Originally Posted by Tahr

The .17 is just a ramset case with a bullet pushed into it so you cant expect too much

Not the 17HMR you were referring to ?

Originally Posted by Bagheera

Not the 17HMR you were referring to ?

Attachment 273975

Tongue in cheek.

Originally Posted by gimp

Thanks for that - looks pretty similar to my results I reckon. Is that SD 5.7 or 57? 5.7 would be exceptionally good !

With the 17gr Vmax my SD was 38

5.7 would be . This is at the upper end of what I usually see.
Lifes getting in the way for the next couple of months but I think I can improve on the group size with some attention and a calm day.

Sight in day. Browning TBolt.
Hornady 17grn VMax

Firstly, 25 yards off bench and shooting pad support. 10 shots fired quite rapidly. .600"



Next, 15 shots fired quite rapidly at 75 yards (top group). 1.505" After this group I remembered it was a 3-9 scope - I had been using 4x that it was set on. So I adjusted the scope down, set the scope on 9 and fired 5 careful shots at 100 yards. A right to left breeze had sprung up. .815"



Interestingly, when I wound the scope down to get it back onto its 100 yard zero the dial aligned at its zero setting again - back to where it should have been. I can only guess that someone had had a fiddle with it - it has been loaned out.
The TBolt is a neat little gun. Barrel uncut and a little muzzle forward suppressor

Originally Posted by Tahr

Sight in day. Browning TBolt.
Hornady 17grn VMax

Firstly, 25 yards off bench and shooting pad support. 10 shots fired quite rapidly. .600"

Attachment 274052

Next, 15 shots fired quite rapidly at 75 yards (top group). 1.505" After this group I remembered it was a 3-9 scope - I had been using 4x that it was set on. So I adjusted the scope down, set the scope on 9 and fired 5 careful shots at 100 yards. A right to left breeze had sprung up. .815"

Attachment 274053

Interestingly, when I wound the scope down to get it back onto its 100 yard zero the dial aligned at its zero setting again - back to where it should have been. I can only guess that someone had had a fiddle with it - it has been loaned out.
The TBolt is a neat little gun. Barrel uncut and a little muzzle forward suppressor

So what do you think?

Originally Posted by gimp

So what do you think?

I think that its an inherently accurate set up that will hold 1.5" max spread for multiple shots at 100 yards. Especially considering the breeze which contributed to windage spread, and my aged sight picture.

It's a neat little caliber. Lot of fun. Fussy in the wind.
The TBolt loads and functions beautifully.
I won it at an NZDA head comp. How about that.

Originally Posted by gimp

So what do you think?

What do you think @gimp?