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I'm running them with 74.5 Retumbo with fgm215m at 3.765" coal out of a trued 700 action throated specifically for the 230's. 30"
Broughton 5c 1:10. I'm getting just a hair over 3,000 fps. It's on par with the .338 Lapua out to 1500 yards except cheaper!!
How did you measure your velocity?
3000 fps is crazy fast and you load is ultra mild?
I have a 28" tube and I am nowhere near that fast.
To the OP:
Hodgdon has listings fot that bullet.
Max load of 77.0 grains of Retumbo for 2714 fps @ only 55,200 psi
Max load of 76 grains of H-1000 for 2721 fps @ 58200 psi
They also show a few other powders.
2 ways. Chrono data and real world data. I actually didn't believe it myself (chronograph) but 1st shot at 900 yards and "ping". Also you have to take into consideration the barrel make. A Broughton 5c is known for being super fast. I got my load data from Bergers manual and they also say+ 25 to 30 fps per inch past 26". So theoretically that's 100 to 120 fps faster than 26".
There is a hide member on here some where that actually made my mind up on the Broughton. He was shooting the 215 Berger at over 3100 and that was from a 26" Broughton. Scenaro contour. He was whacking antelope at 1285 yards.
Lets put it this way... When I was breaking the rifle in I bought a cheap box of fusion bullets. The box said 3100 fps. I was getting 3315. Confirmed at 600 yards.
I understand all of that, but you load would normally start out at 2600fps in a 26" tube.
4 inches X 25fps=100fps Somehow you gained another 200fps?
I'm not a buyer nor do I believe the 5r Broughton bought you 200fps.
I have lots of friends with that barrel....good barrel, but it isn't that fast.
Sorry man, my post came across like an accusation...not my intention.
I guess what I was coming to is there is no free lunch where it comes to velocity and pressure. In other words to get the velocity you are talking about something is generating a great deal of pressure.
Be it short leade, thick brass, extremely tight chamber, tight bore, or whatever...something is creating your pressure and resultant velocity.
I have seen this before in short leade 300Winchesters...In fact I loaded for one last night.
A while ago we shot some old high energy 200 gr Nosler partitions through the gun....I noticed the gun barking excessively so we ran it across the chrono...we near chit when we saw the velocity just under 3100fps!
The brass showed no sign of significant pressure, but I can assure you it was there...In scary spades!
To carry things on step further a 230 is a very long bullet that takes up a great deal more room in the case and serves to further increase pressure.
Just a heads up.
I'm running them with 74.5 Retumbo with fgm215m at 3.765" coal out of a trued 700 action throated specifically for the 230's. 30"
Broughton 5c 1:10. I'm getting just a hair over 3,000 fps. It's on par with the .338 Lapua out to 1500 yards except cheaper!!