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Has anyone done any jump tests yet?
I tried them this weekend in my Match Rifle at 1000, 1100 and 1200 yards.
Average velocity was 2855 fps (50.5 grains of RS 60 and a moly'd bullet) in new Lapua SP cases and CCI primers.
Has anyone done any jump tests yet?
I tried them this weekend in my Match Rifle at 1000, 1100 and 1200 yards.
Average velocity was 2855 fps (50.5 grains of RS 60 and a moly'd bullet) in new Lapua SP cases and CCI primers.
Fired in a 1-9T 34" Krieger.
I gave them 5 thou jump and ended up with what appeared to be 3 or 4 groups, each of c.0.25 MOA, spread over 1.5 MOA. It wasn't
Velocity as I chrono'd them all so assume it has to be the jump as I got the patterns over 60 shots. I tried both supported and rested shooting positions to eliminate those variables and it still performed the same, bullets going consistently into one of the groups.
Photo belowView attachment 1047543
I am planning on trying them with 10, 20 and 30 thou jump next weekend, I think my chamber is too long to actually jam them.
AA1200, I hope you are shooting these out of a 300 win mag rifle and not a .308 rifle. 50+ grains of any powder would be pretty hard to stuff in a .308 case. Yet alone the pressures in order to get them at over 2800+ fps. Hope you still have your fingers to type back and your eyes to see this post
Where in Australia can you buy RS60? I've had no luck at all finding it hereHehe, it is out of a Barnard Model P .308 with a 34" barrel. I have never had a problem with those sort of velocities with a Lapua SP case, I was pushing 215 grains at c.2825fps with 49.5 - 50 grains of RS 60 behind them and could get 7+ uses out of an SP case (5 out of an LP case) and c.2,500 rounds before the barrel started to go.
Doing a pressure series with the Sierra 200s I got up to 52 grains (c.6% powder compression, which is fine with RS60) which started cratering the primers and I wouldn't want to shoot on a warm day. That gave velocities of c.2950 fps.
The tightest group over the chrono was at 51 grains with an ES of 16fps and an SD of 6.76 (average of 2889 fps). For long range I'd heartily recommend RS60, all of the top Match Rifle guys use it, having replaced N550, and it handles compression and temperature fluctuations very well. I've used it in sub-zero temperatures and 35C out in Australia without any noticeable changes in performance other than velocity increases in warm weather, but still a similar spread and group size.
Where in Australia can you buy RS60? I've had no luck at all finding it here
Unfortunately it was in rounds loaded in the UK and shipped over as part of a touring team. We couldn't find any suppliers, but that was back in 2016.
There was a fella at the Tx LR match running R17 in a 308 with the 200 20x at 2800fps.Thats crazy fast out of a 308.
It's amazing what you can do if you consider your brass to be a consumable
On a more serious note, some of the newer powders can do some serious voodoo magic when it comes to speeds. Used to be H4350 was good for about 2700-2750 out of a 6.5CM behind a 140gn bullet. More than that was a recipe for loose primer pockets in 2-3 firings in the original Hornady brass. Nowadays... with small primer brass and the newer powders like RL16 and RL26, people are getting crazy velocities out of the same bullets - 2850-2900+ fps - supposedly with 'zero' pressure signs. Eventually that's bound to bleed over to other cartridges like the .308 Win. Between new bullet designs with relatively short bearing surfaces, tight meplats and high BCs, along with new powders and small primer brass... some of the crazy Aussie loads might become viable for the rest of us![]()
Reload Swiss RS60 and Alliant Reloder 17 are one and the same thing, so non European shooters who have access to the Alliant range can get it. I tried it in FTR and whilst MVs were superb, I never got the consistent precision I wanted.
Laurie - are you sure about that? According to the Reload Swiss website, RS60 is single based, whereas RL17 is purported to be double-based according to the information I can find. Just curious why the discrepancy in the two descriptions. Regardless, pushing 200s over 2800 fps out of a .308 F-TR gun would certainly bring some recoil management issues along with.
How did these loads do in tge match?
I don't think the case is sitting in the bottom of the chamber when the bullet starts moving in the case neck. Nor when its fired.I'm just wondering if the fact that the body of the case is sitting in the bottom of the chamber doesn't automatically start things out a little off. But now that I think about it, that would cause sideways dispersion (or at an angle, but not random). Carry on.