.338 WM 210 gr. Swift Scirocco Loads
- Thread starter GameBuster
- Start date
I've had great success with H4831SC in most bullet weights. I'd guestimate that 74-78 grains would be about right, and you're probably looking at a slightly compressed load. Seat the bullets out as far as the magazine will allow assuming this doesn't put you into the lands (it shouldn't).
4350 is also right in the middle of the burn rate butter zone for this application, but I've never had much luck with it in my 338.
Reportedly, RL-19 is about the best powder you could possibly use for 210 and 225's in the 338 (velocity wise). I've never tried it, but it's on my todo list.
4350 is also right in the middle of the burn rate butter zone for this application, but I've never had much luck with it in my 338.
Reportedly, RL-19 is about the best powder you could possibly use for 210 and 225's in the 338 (velocity wise). I've never tried it, but it's on my todo list.
Swift makes it's bullets with a pure copper jacket and any "harder" fouling left in the barrel from previous bullet jackets tends to cause the Swifts to shoot erratically.
When you switch to the Sciocco you must start with a clean barrel. All the old "copper" must be gone. (The are like the Barnes "X" bullets in this regard.)
When you switch to the Sciocco you must start with a clean barrel. All the old "copper" must be gone. (The are like the Barnes "X" bullets in this regard.)
Don't have a load for the Swift, but for accuracy at that weight I load a 210 grain TSX with 70.8 of RL 19 (that's well below max), WinLRM primer, seated at 3.34. Velocity is only 2770, but accuracy is extremely good and recoil is light.
Prosper, I haven't found a powder that gives better results for 200, 210, or 225 than RL 19. My pet load for the .338 is a 225 grain Accubond over 75.3 of RL 19 (slightly compressed), seated at 3.44. It chronys at 2951, and standard deviation shot-to-shot is the lowest I've ever seen--just 9 (!).
Dammit, now I feel even worse about spending the day with paperwork instead of out at the range...
Prosper, I haven't found a powder that gives better results for 200, 210, or 225 than RL 19. My pet load for the .338 is a 225 grain Accubond over 75.3 of RL 19 (slightly compressed), seated at 3.44. It chronys at 2951, and standard deviation shot-to-shot is the lowest I've ever seen--just 9 (!).
Dammit, now I feel even worse about spending the day with paperwork instead of out at the range...
At realistic 338 Win hunting distances the velocity (temperature related) variation isn't very significant.
I would go with the accurate load for the confidence it inspires rather than worry about the "extreme thing".
I know what you mean though. One of the aggravations of the 338 Win is that most of the current powders available are either a bit to fast or a bit too slow.
H-4831 is a bit slow, Imr 4350 a bit fast, Rl-19 (in every 338 rifle I have loaded for) is just right.
Good luck!
I would go with the accurate load for the confidence it inspires rather than worry about the "extreme thing".
I know what you mean though. One of the aggravations of the 338 Win is that most of the current powders available are either a bit to fast or a bit too slow.
H-4831 is a bit slow, Imr 4350 a bit fast, Rl-19 (in every 338 rifle I have loaded for) is just right.
Good luck!
Prosper,
Its not the velocity change that is moving your bullet 12 inches at 300 yards.
Assuming you zero at 100 yards (which you shouldn't) you would have to experience a drop in velocity of somewhere around 500-600 fps.
The change you are speaking of must be from barrel harmonics induced by a horrible load.
The best way to identify this problem is to vary your load and shoot a group.
If your most accurate load occurs at 69 grains try shooting a 200 yard group at 67.0, 67.5, 68.0, 68.5, 69.0, 69.5 etc. A good load will still group most of the shots together. A bad one will walk off the paper!
This technique made an incredible difference in my ability to hit consistently at long range (well beyond 300 yards).
It also stopped most of my guns from shooting "great" one day and "not so good" the next.
Try it with a few different powders (try RL-19) and you will see what I mean. It's pretty easy to pick a winner from there.
Good luck!
Its not the velocity change that is moving your bullet 12 inches at 300 yards.
Assuming you zero at 100 yards (which you shouldn't) you would have to experience a drop in velocity of somewhere around 500-600 fps.
The change you are speaking of must be from barrel harmonics induced by a horrible load.
The best way to identify this problem is to vary your load and shoot a group.
If your most accurate load occurs at 69 grains try shooting a 200 yard group at 67.0, 67.5, 68.0, 68.5, 69.0, 69.5 etc. A good load will still group most of the shots together. A bad one will walk off the paper!
This technique made an incredible difference in my ability to hit consistently at long range (well beyond 300 yards).
It also stopped most of my guns from shooting "great" one day and "not so good" the next.
Try it with a few different powders (try RL-19) and you will see what I mean. It's pretty easy to pick a winner from there.
Good luck!
