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Not all is lost. You have two data point temps and their respective velocities. They show an average of 2fps per degree of change. An easy calculation that can even be entered in many ballistic calculators.
You can even verify this by shooting at another data point temp and seeing how close that gets you.
So I bought a Tikka 260 CTR with the ideal of building a 280 AI. However I threw some loads together (139 Scenars/ 42 grns H4250) and after a quick zero, shot a .4 group. I decided I would postpone the 280 build and use it for deer hunting this season. I have been trying to work up a load with some 142 grn ABLR's. I've been to the range a couple times and the last 3 rounds I fired were 43.2 grns of H4350 averaged around 2550 fps ...slower than expected. I plan to bump the charge up to 43.6 - 44. I'm hoping for 2750 - 2800 fps.....am I asking too much for the CTR's 20in barrel and does anyone know of another powder that might get me speed.
Why don’t you just use the 139 Scenars for hunting? I’m pretty sure that @coldboremiracle was using them successfully on many hunts.
You should be able to easily get 2750-2800 with those and they are very consistent shot to shot.
You should be able to easily get 2750-2800 with those and they are very consistent shot to shot.
I could use the 139's but I have about 190 of the 142 g ABLR's. Anyone killed a deer with a 139 Scenars ?
I was wrong above and meant to reference @psinclair as the person who used 139s for a long time with numerous kills every year. He spoke highly of them.
If you want to check out this 10+ year long thread on 24hour campfire, you’ll see the consistency I’m referencing.
Also search here on SH as there are a number of threads discussing similar.
This one very briefly:
Hunting & Fishing - 6.5 139 grain Lapua Scenar for hunting?
Anyone use this bullet with success (or failure)? Was thinking about using it for an upcoming Coues deer hunt in AZ - since these shoot so well in my DT SRSA1.
www.snipershide.com
Thanks....really enjoyed the 24 hr thread,I was wrong above and meant to reference @psinclair as the person who used 139s for a long time with numerous kills every year. He spoke highly of them.
If you want to check out this 10+ year long thread on 24hour campfire, you’ll see the consistency I’m referencing.
Also search here on SH as there are a number of threads discussing similar.
This one very briefly:
Hunting & Fishing - 6.5 139 grain Lapua Scenar for hunting?
Anyone use this bullet with success (or failure)? Was thinking about using it for an upcoming Coues deer hunt in AZ - since these shoot so well in my DT SRSA1.
Ive used Scenars for hunting, but not the 139. I'd have zero issues trying them though based on my experience with other Scenars as well as other hunters experiences.
I've used a variety of other 140 glass match bullets, like the Barnes Match Burner, Hornady BTHP, and Sierra Match Kings.
I’ve had similar results, but did incorrectly reference you when I meant @psinclair . I’m actually most fond of the 136g Scenar Ls, though they are not inexpensive at all.
Got 2575 today with 43.5 gr, H4350 / 142 ABLR no signs of pressure, Just loaded 2 @ 43.7 & 2@ 43.8 gonna try them tomorrow.
