Home Forums Hunting & Shooting Custom Rifles & Wildcats 7mm ultra ackley mag

is there annybody out ther some have a 7mm ultra ackley mag?? hove much velocity can i gain over the standard 7mm ultra

Not much.

just like any standard AI, about 150fps... <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />

My Warp 7 will send a 150 SMK 3390 .35, 5 shots and 3275 160 Accu Bond .55, 5 shots with RL 25 out of a 26 inch tube. It is a improved 300 win mag with a 35 degree shoulder water cap of 94.6 grains in a Lapua case.

Have not worked with other powders yet but I am building a competition rifle out of this cartridge that will use a 1x9 twist and shoot the 175 SMK's. The current reamer is a no turn neck for hunting rifles.

5 fps <img src="/ubbthreads/images/graemlins/blush.gif" alt="" />

Just kiddin, but seriously, the UM is already about as improved as you can get. You'd be lucky to eek a few more grains of powder into an improved case, and hence velocity gains would be modest, 25 fps in practical terms. You'd pay a bunch in the costs for custom chamber reamer and dies, and pick up at most as much as a std um in a barrel 1" longer.