Thread: 7mmSaum test fire

Looks very promising. You got to be pleased with that result.
Like you I started with 2217 in SAUM but recently started playing around with RL23 and N560 cos sweet spot with 2217 in model 7 SAUM was down around 2880 fps (22in bbl).
Ladders with RL23 and 160TMKs 59gn - 61.5 gn at 2975fps and pressure good, no head stamp or ejector marks, bolt lift sweet, so could go a bit higher.
And ladder with 162AMAX and N560 61gn 2900fps, 61.5 2953fps faint head stamp, 62 gn stickie bolt.
So next step is shoot some groups with RL23 and try some RL26, hoping to get closer to 3000fps but anywhere north of 2950 with tight wee group would be nice.

@Tahr what twist rate is your barrel? The Tikka 695 I swapped for my old Rem has a near new T3 barrel and it doesn't seem to like the 162 gr bullets, my son's T3 is the same both 7mm Mag. The 150 gr ELDX is looking better.

Originally Posted by Mooseman

@Tahr what twist rate is your barrel? The Tikka 695 I swapped for my old Rem has a near new T3 barrel and it doesn't seem to like the 162 gr bullets, my son's T3 is the same both 7mm Mag. The 150 gr ELDX is looking better.

8.7:1

Originally Posted by chainsaw

Looks very promising. You got to be pleased with that result.
Like you I started with 2217 in SAUM but recently started playing around with RL23 and N560 cos sweet spot with 2217 in model 7 SAUM was down around 2880 fps (22in bbl).
Ladders with RL23 and 160TMKs 59gn - 61.5 gn at 2975fps and pressure good, no head stamp or ejector marks, bolt lift sweet, so could go a bit higher.
And ladder with 162AMAX and N560 61gn 2900fps, 61.5 2953fps faint head stamp, 62 gn stickie bolt.
So next step is shoot some groups with RL23 and try some RL26, hoping to get closer to 3000fps but anywhere north of 2950 with tight wee group would be nice.

@chainsaw Yes, 2950 and tight groups is what Im looking for.

Are you going on another old farts Tahr hunt?

Originally Posted by Kudu

Are you going on another old farts Tahr hunt?

Brian and me. Yes, we are old farts alright

Originally Posted by 7mmsaum

68g of 2217 and any projectile from the stunning 150NBT to 162 ELD-X and your good to go

+1 for the 150NBT.

So the results are in.

62.5 grn R26 (starting load, mild) 2,873fps .75" - 3 shot group 160 Sierra Tipped Target

67 grn 2217 (.5 grn under ejector stamp load) 2,859fps - .5" 3 shot group - 160 Fed Fusion

59.5 grn Hybrid 100V (.5 grn under ejector stamp load) 3,009fps - .5" 3 shot group - 160 Fed Fusion

All seated @20 thou.

So the Hybrid 100V wins hands down and I will now load a batch to validate a drop chart.

Nice !! that Hyb100V goes real well in short magnums

Nice work, so Tahr you wont be needing all that Re26 then......

Originally Posted by outdoorlad

Nice work, so Tahr you wont be needing all that Re26 then......

I use it in my 270wsm. I have 5 tubs of it.

Interesting results - the CZ 7x64 that I've just traded back to @nor-west gets 2820 fps with 53.4 grains of powder with the Sierra 160gn projectile and the same sort of accuracy (from a 24" barrel it has to be said). It'll run at 2950 fps but that isn't in a node so accuracy suffers a bit at the higher speed . . . .

Originally Posted by Mooseman

@Tahr what twist rate is your barrel? The Tikka 695 I swapped for my old Rem has a near new T3 barrel and it doesn't seem to like the 162 gr bullets, my son's T3 is the same both 7mm Mag. The 150 gr ELDX is looking better.

Interesting. My T3 based .284 Win with 162 ELD-X does .7 MOA 5 shots with an ex 7-08 T3 barrel at 2740 with 2213SC.

Originally Posted by Tentman

Interesting results - the CZ 7x64 that I've just traded back to @nor-west gets 2820 fps with 53.4 grains of powder with the Sierra 160gn projectile and the same sort of accuracy (from a 24" barrel it has to be said). It'll run at 2950 fps but that isn't in a node so accuracy suffers a bit at the higher speed . . . .

Yeah, @Tentman the 280/7x64 is superbly efficient. I use 6 more grains of powder to get 3k but do have the advantage of a 22" barrel and a 5lb 10oz rifle. I like light and quick.