I know that the 350 Mag would be the cats meow if it had more space to seat longer heavier bullets. Allegedly matching 35 Whelen ballistics in a short action. The only thing holding it back is more leg room in the mag.
Well, I just received a Remington 673 that allegedly has a Wyatt mag box and a receiver which has been professionally opened up some per the seller. At the same time it looks as if never been fired. I have not taken the stock off to measure the clearance of the mag opening or the dimensions of the mag box yet, but assuming it is legitimately capable of handling bullets exceeding 2.800 COL, what would be an ideal length for unleashing the 350 mag performance for say a 250 grain bullet? For those who are not aware the 673 is a remington seven action with a 22" barrel.
I know many state that 225gr is the most bullet this cartridge is cable of with the magazine length restriction in an off-the-shelf rifle, and even at that, the bullet is sitting in the boiler room some.
Just excited to start playing with loads and wondering if anyone can help with a starting point.
I know that the 350 Mag would be the cats meow if it had more space to seat longer heavier bullets. Allegedly matching 35 Whelen ballistics in a short action. The only thing holding it back is more leg room in the mag.
Well, I just received a Remington 673 that allegedly has a Wyatt mag box and a receiver which has been professionally opened up some per the seller. At the same time it looks as if never been fired. I have not taken the stock off to measure the clearance of the mag opening or the dimensions of the mag box yet, but assuming it is legitimately capable of handling bullets exceeding 2.800 COL, what would be an ideal length for unleashing the 350 mag performance for say a 250 grain bullet? For those who are not aware the 673 is a remington seven action with a 22" barrel.
I know many state that 225gr is the most bullet this cartridge is cable of with the magazine length restriction in an off-the-shelf rifle, and even at that, the bullet is sitting in the boiler room some.
Just excited to start playing with loads and wondering if anyone can help with a starting point.
I am a 350 Rem Mag fan, shot many thousands of rds in a modified Rem Model 7, with factory 20" barrel.
First I am a retired machinist with a Bridgeport mill and 2 lathes, including Hardinge tool room lathe.
So I modified the box metal and feed ramp to take 2.910" length cartridges out of the mag. Aluminum Pillar beded, tactical bolt knob, and threaded the barrel for a PA M72 severe duty brake. So it feeds longer cartridges out of the mag and capable of half inch groups with a variety of ammo all in a walnut stock.
For light bullets 200 to 225 use Barns manual #4 their 200 reaches 2943 fps and 225 reaches 2764 fps with 64 grs of Tac and 62 grs of Tac they use a 20" barrel and my velocities were within 15 fps. No modifications to mag necessary with these bullets.
My favorite loads in heavy bullets starting with light 225 Sierra to heavy 310 Woodley use PP 2000 MR. These are all 2.910"
Important : it depends on the case you use reformed 7 mm mag, 338 win mag 300 win mag etc. Or Remington factory brass or Nosler factory brass as max loads must be reduced 1 grain if using heavier cases. Some 300 mag will require more work, because of heavier case walls.
Winchester and Remington cases have different volume, from 7mm to 338.
At 2.910 COAL 250 Speer, Hornady, or old Win power loints (very accurate) 64.4 gr PP 2000MR 2611 fps 7.2S/D reformed cases...went to 66.0 grs on Rem factory 350 Mag cases...so there IS a difference in case volume of reformed and orginal case capacities depending on cailber and brand...you have to adjust with max charges.
225 Sierra 2.910" 66 grs. PP 2000MR = 2723 fps ave.
280 gr Swift 2.910" 61.5 gr PP2000MR = 2435 fps ave max load.
310 gr Woodleigh 2.910" 57.5 gr PP2000MR = 2260 fps.
These are max or close to it at 2.910" in 350 Remington Mag brass. Reformed brass usually requires reducing powder charge, because it has smaller capacity.
Good fire forming load is 158 gr Speer .357 mag pistol bullets, deep curl are especially accurate and davestating, with 44.6 gr IMR4198, OR Speer manual loads for 350 Mag with pistol bullets. These loads for your entertainment only and not recommended for any rifle...cause every change in C.O.A.L, OR COMPONENTS, CAN MAKE A HUGE SPIKE IN CARTRIDGE PRESSURE.
