Originally Posted by idaho elk hunter
Just finished a custom build for a customer this morning. I built it on a Remington Long action. I rarely use Remington's and have been known to actually refuse to use these actions. But the customer insisted and paid extra. I went out and shot the full load developments this morning and this is what I came up with. Long Remington action ( original a 8mm Rem) Custom Wyatt extended box mag. Bartlien 28 in Barrel progressive twist or t style rifling. Final twist rate 1 in 8.65. Left hand twist. 5R RIFLING. 175gr LR Accubond. 180 Berger would also work. Win Mag primer. Bullet seated way out! I am not going to give all info, this is what I get paid for. I use Retumbo exclusively for the heavy 7mm bullets. Lets say somewhat over 76 gr of powder. Bullet moly coated. Brake is of my own manufacture. etc. 3275 fps! This OUT POUNDS all 300 win mags that you or Broz claim to do. The form factor on the 7mm just out does the 30 cal. But I don't expect you to understand form factor. Some just argue. I like all calibers. but at the end of the day the 7mm and the 338 are superior calibers for North American game when it comes to long range. Go crawl in you cave and know that the real people that are not internet warriors are laughing at you. ( Brian Litz, John Lazzeroni, Myself and the rest of the educated world)
Lots of babbling man... Gist is you've built up a really fast 7mm rifle for a client on a m700 action and she'll do nearly 3300 fps with a 175. If it's a small enough case to only use 76 grains of powder to get there you need to be hitting 90,000 psi+. My guess is you are loading well over 100 grains of powder into the case, and if that's the case retumbo is to damn fast of a powder in a 7mm bore. You need to be looking at one of the powder offerings for the 50 bmg for this caliber type; ex. would be h50bmg, rl50, wc872. Good luck with the rl accubond; I'm getting the 150 to 3300 fps in my 24" bbl. 7stw at .5 moa accuracy, but some are having real accuracy trouble with them at high speeds; others are noticing they are pretty soft at high speed impact. Most are noticing the bc's are inflated so out-pound 10% off of the bc before you make the comparison.
Keep blowing smoke circles; it's fun to shoot arrows through them.