My 7mm RUM is on an M70 action/box mag so this effects the COAL. Bullet jump is nearly half an inch, totally ridiculous. I can only acheive optimum accuracy with high SD/ bearing surface projectiles. If I use something like the 162gr SST, there is a moment apon firing, where the bullet is neither in the case mouth nor engaged in the rifling. The projectile is therefore prone to enter the rifling at non concentric angles. Both increased twist rate and increased velocity worsen yaw after the bullet leaves the barrel. In the M700 action, the results are not much better. Worse still, as the throat wears, starting at about 150 shots, bullet jump is increased beyond a half inch.
I have tried seating bullets out for single loading and while the accuracy is good, I am tired of the whole stupid design and excessive wear. I recently taught two newbie hunters how to shoot long range, one has a 7mm rem mag, the other, a .300 Winnie. Both guys are able to acheive the same long range performance as I am getting but without all the BS that goes with the RUM. Its sad when I am playing teacher and the guys I am teaching have a more common sense cartridge in hand.
I ran in a factory M700 medium contour barreled 7mm RUM a few weeks back, ran it in and wore out the throat over the space of two weeks. The rifle went from shooting fliers to run in and shooting nicely to worn out and groups wide open. I did try to keep the barrel cool etc, the usual no more than 12 rounds taken to the range at a time and rested the rifle between 3 shot groups. In due course, I will cut the barrel in half and publish the pics of the throat on the net. I should mention, some of the 7mm RUM barrels in circulation are showing signs of craze cracking (bore scope), something that takes about 50 years of continous shooting to acheive with an ex military M1917 or Lee Enfield etc.
Your cartridge on the other hand is a practical design. I get 3184fps with the 180gr VLD from the 26" barreled RUM, you will probably get 3050fps to 3100fps, an unnoticeable difference in the field.