yobuck
Well-Known Member
Very few people have shot 10 shot 4" groups with any rifle, let alone while shooting cartridges like the 30x378.In the 30 cal range, I have 308/26-Nosler (a bit bigger than 30 Nosler) and 300 RUM. The RUM is a 30" Bench Rest on a R700 accurized action. I have not made 4" 1000 yard groups.
I would choose the 300 RUM. "Practicality" over absolute speed. The why is below.
"There is no replacement for displacement" is true to an extent. Ballistics, like motorsports reaches a point of diminishing returns.
Case capacity and fps with 28", 245 Sierra: using QL and "knowledge" of shooting chamberings close to....
Approximately:
30-378 133 = 2950 fps
300 RUM 112.5 = 2850 fps
30 Nosler 99 = 2750 fps
Each step down is worth about 100fps with the same bullet at about the same PSI and "optimal" powder and charge. Not most accurate. Not the best COAL. Just "same" to "same". Can you "go faster", sure.
so, to me...
The 300 RUM is practical in most magnum class long actions, has the speed to reach 1000 "easy" and 1 mile practically.
If you already have the single feed action, please share which one and the bolt face and maximum COAL it handle.
Hard do advise without data.
Which is why those records hold up as long as they do.
Even those who set the records, rarely duplicate their own record.
Back in the day, the 30x378 was used by a very small group of long range hunters.
And most of those were found in PA, mainly due to the man largely responsible for creating the cartridge.
That being the late Howard Wolfe of Mifflinburg PA.
Reasons being that there were few suitable actions for them, and few suitable powders for loading.
Howard created his own action, which was/is a large 3 lug design.
He had a large machine shop in Williamsport do the bulk of the work on them, as his small shop lacked the required machinery.
That was before C N C machines were being used, which is why there are so many good action choices at reasonable prices today.
Also companies like Berger werent in the business of building hunting bullets at that time.
The best powder was and still is H 570, which is a WW2 machine gun powder.
Howard would hesitate building a gun if you didnt have that powder.
You did what he told you as for loading, or you didnt get a gun built.
Using his action, with a 36" barrel, we loaded 112 to 114 gr of H 570 with a 200 gr SMK.
Velocity would of coarse vary a bit from gun to gun.
My velocity with my gun with 113 gr of H 570 and the 200 gr bullet was 3500 FPS with a 36" barrel.
When Sierra came out with the 240 gr bullet, i bought a box of them.
I settled on 108 gr of H 570 for a load for them.
At 1500 yards the trajectory difference wasent even close, with the 200 gr being much flatter shooting.
In fact i needed to get out to almost a mile before the 240 became the better choice.
And i frankly only know one man who i would believe, who has killed a buck at a mile in PA.
And he used a 338x378 with a 250 gr SMK to do it.
Same deal with that cartridge as well.
Believe what you see with your own eyes on the side of a mountain.
And not what some number stamped on the box tells you.
