My hunting partner is on a budget and only has a Ruger 270 Winchester. I've been attempting to work up some 150 gn Elk loads for it. My goal is to get a 150 gn Matrix RBT bonded bullet flying as fast and accurately as possible within reason. Since the Matrix bullets are a bit pricy I have been using 150 gn Burger hunting VLD's for testing as I have some and they are cheaper.
My first problem is that I'm not seeing near the published velocities on my Chrony. I'm talking at least a 100 FPS below what I'm seeing in published data. I actually thought my Chrony was reading low so a bought a second one of a different brand and it read essentually the same so that's not the problem. I soon plan to borrow my hunting partner's Ruger but right now I am testing my loads with a Remington Model 700, 24" barrel, 270 Win. Like other Remington's it has a really long throat so I'm thinking it might be reducing pressure and velocity? I also use a forster neck bushing die on most loads and size the neck down as little as necessary and wonder if that might also reduce pressure? I have mostly tried the slower burning powders, H4831SC, RL-19, IMR 7828, Magpro, and I have some IMR 4831, RL-25 and H1000 but haven't tried those last 3 powders yet. We did try Magpro in his rifle and it didn't seem to like it at all though it looked like it could be promising velocity wise. I did however get good accuracy and velocity with the Magpro in my 270 WSM with the Burgers and even better with the few Matrix bullets I shot.
Any thoughts on the low velocity readings would be appreciated and maybe some suggestions on load work up for the powders I have on hand or any other would be useful. Thanks in advance.
Thanks FEENIX for the tip. Read the story "270 Win for long range shooting". Great story and looks like a great rifle he had build.
My friends 270 only has the 22" barrel with 1/10 twist so am looking more at the Matrix 150 gn RBT Bonded bullet for my friends 270. I reloaded (5) 270 Win bullets today using max published loads and 150 gr bullets with Norma cases to see what the actual velocity would be using Magpro, IMR-4831, IMR 4350, H1000 and RL-19. Will head to the range today and see what they Chrony. I suspect the Magpro will win the speed test but we'll see.
Never thought I'd get into the 270 win, as I've been using 7mm's for years, but I currently own two. Both are 22" barrels and have been chrono'd with a ced mellenium and an oehler. The 22 inch pipes are not gonig to get you quite as fast as the 26" that some of the books show. However, with a 150 hornady, I am getting 2850 fps with 56.5 7828 with a wlrm. Consistant 5 shot 1" groups.
I had just come from out back shooting off my 5 test rounds for velocity when I got your post and I had some cases already prepped so I made a 6th test load using your load data and went back out and shot it also. (I live in the country).
Here are the results from my test using a ProChrono at about 12 ft from the muzzle:
1. 55 gn RL-19= 2656, 2. 59gn H1000=2677, 3. 51.6 Gn IMR 4350= 2640,
4. 53 Gn IMR-4831=2640, 5. 61.5 gn Magpro=2824,
6. 56.5 gn IMR 7828= 2688
WLR primers used for all except WLRM used with 7828 and Magpro. All cases were once fired Norma cases neck sized with Forster bushing die.
The rifle used for test was Remington 700 270 winchester, with 24" barrel.
All the published data I have say's these loads should fly about 100 plus FPS faster than they do? I have checked the chrony agains a new Shooting Chrony and get pretty much the same results.
Any thoughts anyone as to why the velocity discrepancy??