Originally Posted by
Jake Duke
The calibers that ive seen that have a tendency to be hard on a throat are usually significantly over bored. Massive amounts of powder and a very tight burning cylinder. I think the 257-6.5-270stw-rum or even larger could fit this category. The 300 win mag capacity is quite efficient for 277 and 7mm bullets. The 7mm Jarret, an awesome round is a 300 win mag necked down to 7mm. According to several gunsmiths i have used, throat erosion is highly determined by the operating temperatures. Meaning long strings of successive shots do more damage than a few high powered shots.
Hey this isnt for everyone, i was replying to the op with real world experience on his question.
my point is, your claiming the MV which you say you chronied, the win mag has just over 90 gr capacity, its 92% of the STW, but your getting 97% of the MV of the STW with 69 gr. of powder (or 82% of a full power stw load, which is only 76% of the case capacity, my friend I've been stuffing powder and bullets in cases since 1978, what your describing just isn't possible. burning powder gases make pressure, pressure makes velocity, you can't use less powder in a large case and make more pressure.
there are things you can do to delay throat erosion, but even a 223 will burn the throat out in about 6,000 rounds (I know this, I've probably shot out as many barrels as anyone, my 6.5 is on its third barrel and its a 270 necked down) and the 300 winny is overbore at .284, heck the 7 mag is overbore
RR