I will be trying some 115g NBT's in this rifle with Retumbo tomorrow morning. I need a good 600-700 yard deer load with the NBT's as I dont trust the VLD's, way to elplosive...Hopefully I can get the same velocity/accuracy around 58-58.5g at around 3250fps.
I have had excellent luck with a very stout load of Re-25 and 110 grain Accubonds in my Model 78 Browning. I settled on 57.5 grains which is very stout but that is where I lost the vertical stringing. I worked up to 58.5 but primer pockets don't last long which to me is a message to back off. I don't have a chrono but that load is screaming and meat loss has not been an issue, including one buck I hit at 50 yards. Work up from 55 grains in 1/2 grain increments and in my case, I had vertical in the groups until I hit 57.5 and then they are all round. My Weatherby 25-06 shoots that load also but not as accurate as the single shot.
I have a Sako 75 and I reload 50.5 grains of IMR 4350 and shoot the Triple Shocks and the other bullet is the grand slam. This gun is not a 600-700 yard gun as it does not have enough energy at this range. If you think you need a 600-700 yard gun then go to a 7mm or 300 as they have many different bullets in many different grainsthat are capable of having enough energy for that range. The other thing is this load is around 3000 fps and has a devastating amount of hydraulic energy and bloodshoots the quarter it hits. I would really try and shoot for the neck to avoid a large amount of meat loss.
115g NBT at 3200fps has plenty of power to take deer down up to 600 yards, I know that for fact as more then a few whitetails and muleys have bit the dust at that range from my 25-06's over the years. I think I can squeeze 100 more yards out of them in real good conditions. I stopped using my 25-06 on deer a few years back when I started getting into 800-1000 yard shooting/hunting and started using a 300 RUM and 7 RM. However, I am going to start using it once again as an alternative to my 338 EDGE.
Anyways, if you go by the old wives tale of "needing" 1000ft lbs, then the 115g NBT at 3250fps still has that out to 650 yards, and is still traveling almost 2000fps, which is more then enough to make it properly expand and do its job. At 700 yards, you are looking at little over 900ft lbs and 1900fps, which IMO, is still plenty for any deer.
It really is amazing how far standard cartridges with decent bullets will get you. You dont need a magnum to kill deer at 600-700 yards. If your shooting further then that, then yes you need something that is bigger and faster.
I just worked up a load for my older model Sendero 25-06. Blued barrel.
Using once fired Hornady Brass, Combined Technologies 115gr Ballistic Silvertip(coated), Federal 210 Match Primer, 50gr H4831, I was able to get .324 group with 3 shots. Almost one hole.
No Chrony yet so I do not know the velocity. Pretty good I believe.
I have to reload 20 or so and see if this is repeatable, and good at 200 and 300 yadrds, but having shot a group nearly that accurate at 48 gr, I feel it will be.
From what I have read, the lubalox coating may actually bump the velocity up a bit over normal although it is likely not significant.
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