The UK's Finest Independent Forum for Shooters and Gun Owners. Est 2010.

Let's hear what your using:

TRG-22
26" Bartlein 1:8 twist
Lapua brass
140gr Berger hybrid
CCI 200 primer
COAL touching lands
H4350

42.9 - 2776
43.2 - 2804
43.5 - 2823
43.8 - 2834
44.1 - 2887

For each increase of 0.3 grain of powder your velocity increases by 28,19,11 and lastly by 53 fps. why is this? I was expecting a smoother curve. Did you take all the readings on the same day? Or is this to do with pressure.
One for Laurie I think.

All most the same

Tikka t3 bartlin barrel 1-8 twist 26"
Lapua cases
Cci br2
140 hybrids
H4350 42.2 2818fps
Difference is coal 2.880 to fit AICS mags

I found the jump made no difference with these Bergers. Groups 1/2 moa or better.

Re the jump in speed, it might be as the case get very full pressure goes up a lot. That's just a guess Laurie will be along soon.

AI-AT .260 Remington
26" barrel
Lapua Brass
Lapua 139gn Scenars
CCI 200 primers
COAL - 2.825" (20 thou off the lands)
HODGDON - VARGET

35.5gn - 2,590 fps
36.0gn - 2,633 fps
36.5gn - 2,661 fps
36.7gn - 2,678 fps
37.0gn - 2,691 fps
37.3gn - 2,717 fps
37.7gn - 2,740 fps
38.0gn - 2,746 fps <<-- GOTO LOAD @ 57,539 psi

AE3 26inch heavy Border barrel 1 in 8.5 twist.
Mainly set to 10 thou off lands.

139 scenar:
42.5gn Hunter Ave 2680
40.5gn N160 Ave 2585
41gn N160 Ave 2600
42gn N160 Ave 2710
44gn N160 Ave 2900

PPU 139gn:
42.5gn N160 Ave 2630

140gn SMK:
43gn Hunter Ave 2680
40.5gn N160 Ave 2570
42gn N160 Ave 2730

123gn Scenar:
43gn Hunter Ave 2690
40.8gn Big Game Ave 2770
44gn N160 Ave 2840
44.1gn N160 Ave 2860
45gn N160 Ave 2920

130gn Norma Golden Target:
45gn N160 Ave 3000

107 SMK:
44gn Big Game Ave 3160
44gn N160 Ave 3080

How sensitive do you guys think the 260 is to seating depth and has anyone tried N550 with it ?

Thx

When I had my factory Tikka t3 1:8.5" I think I settled on 139 gr scenar with 37 gr of n140 seated to 2.826" worked a treat, I didn't get chance to chrono it. it's not published anywhere to use n140 but why not, (ask SimG) coincidentally it's a mates accuracy load with his 6.5x47 surgeon who yesterday shot a 49 ex 50 McQueens very windy conditions and at 300 instead of 200

I now have that rifle and after a bit of load development using Nosler 140gr Custom Competitions I settled on 36gr of Lovex S062, a nice mild shooting load that gives better accuracy than I can physically manage to shoot with.

Couple of sample targets shot at 100m (centres are 1" squares), 5 shot and 10 shot groups shot in a 15-18mph crosswind,

TJC wrote:How sensitive do you guys think the 260 is to seating depth and has anyone tried N550 with it ?

Thx

N550 works great with 123g scenars or SMKs.....somewhere between 41.5g to 42.3g seems sweet.

phaedra1106 wrote:I now have that rifle and after a bit of load development using Nosler 140gr Custom Competitions I settled on 36gr of Lovex S062, a nice mild shooting load that gives better accuracy than I can physically manage to shoot with.

Couple of sample targets shot at 100m (centres are 1" squares), 5 shot and 10 shot groups shot in a 15-18mph crosswind,

Jeff
Looking good then !. clapclap