H1000 in 260 Remington

[JER]

Will it work with 123 and 140 gr class bullets,Lapua and Sierra)? How much do I need, 48 to 49 grains?

 

[JER]

Let me rephrase the question. Has anyone used H1000 in the 260 Remington? If so, what primers, charge weight, and bullets did you try?

 

[JER]

Thanks for the feedback.

I'm curious now. How come H1000 provides > 3000 fps with 105s and 107s in 243 Win, but falls short in the 260?

 

[memilanuk]

This info is second-hand at best, so take it for what it's worth...

Fellow I shoot w/ from time to time used to run a 6.5-08,aka .260 Rem). He had a special load worked up for our one 1000yd range in the state... Rattlesnake Mountain, a fairly windy, switchy, and just plain humbling place to shoot. The load was a 142gr SMK, cases formed from Winchester .308,thinner, lighter, therefore more internal capacity), and a whole bunch of H1000... something like 50gr or so. Said he had to use a *long* drop tube and vibrate the case to settle it all in there w/ room for the bullet. I think he was getting close to 2900fps from a 30" palma contour barrel. I've heard other people claim similar velocities from other powders such as H4350, so I'm not sure in hindsight that it's really worth the trouble. I'm not sure if it still stands currently, but I do recall he did set a range record,and there are a number of pretty good shooters that go there regularly) w/ that load, so it did shoot pretty dang well.

HTH,

Monte

 

[techshooter]

JER:

The .243 has a smaller bore diameter then the 260, therefore the bore volume increases slower than the 260 for an equal amount of bullet displacement. H1000 is a slower powder,generates less gas per unit time) than H4350, so it is a better match to the smaller bore,.243) than the larger,.264). Ever notice how the faster powders,Varget, 4895, 4064) are common for the .308, but slower powders,4350, 4831) are common for the .243? It is all due to the rate of gas production, matching the chamber/bore volume expansion as the bullet moves. Bigger bores generally use faster powders,but more of it). The better the match of production rate to bore volumetric change rate, the better the velocity produced.

Cheers,

 

[JER]

Techshooter, thanks for the great explanation. Makes sense.