It seems like the 130's might be a better choice for smaller case capacity cartridges like the 260 when shooting 1000 yards.
Joe,
many people reckon that 120-130gn bullets are very well suited to the smaller 6.5s when used in standard length (short) actions - 6.5X47L, .260 Rem, 6.5 Creedmoor. Having said that, there are several long-range shooters around who've done really well with 140s at 1K with the 6.5X47L in particular. Having tried both, I've come down on the light bullet side for this trio, but I'll emphasise it's a matter of personal opinion and taste.
On paper, the 130gn Norma should be the best of the lighter bunch. With a really low 0.905 G7 'form factor' (where low = less drag and therefore 'good'), it's beaten in the efficiency stakes only by the 140gn JLK VLD and 136gn Hoover amongst the 6.5mm bullets that Bryan Litz evaluates in his 2nd edition of
Applied Ballistics for Long Range Shooting. As Steve (Sleepygator) says, a ballistically top-notch heavy always moves less in the wind though even though starting out slower at equivalent MVs. So, it's really down to what suits these cartridges and what your rifle likes - don't choose a relatively small ballistics gain over something that groups better.
However .... taken from a small sample (of four or five rifles and barrels), the 130gn Norma seems to be a fussy beggar. I was offered some by a fellow Brit .260 Rem shooter who'd bought several hundred based on the BC figures being way ahead of the 123gn Lapua Scenars he usually shot and better than the 130gn Berger VLD, but couldn't get them to perform at all in a brace of 260s. I tried them in my 260 with a heavy Bartlein 1-8" twist 5R barrel, and they just didn't want to group there too. They did do well in full-house loads in a 6.5X55mm with a 4-groove Bartlein, so they're maybe 'fussy' and/or need driven a bit harder than 260 etc will do.
Like I said though, that's a small sample, and we may hear from scores of satisfied .260 Rem, 6.5X47L etc users about their experiences with this bullet.
In your case, I'd stick to the 142gn SMK since you're shooting the larger 6.5-284, and if you want to experiment look at the most efficient of the 140gn class bullets - the JLK and Bergers (Hybrid + VLD). The G7 BCs are:
130gn Norma ................. 0.294
140gn Berger VLD .......... 0.313
140gn Berger Hybrid ...... 0.317
140gn JLK VLD ............... 0.321
142gn SMK ..................... 0.301
