Originally Posted by trophyhunter170
Thanks for you info, it should help me a lot. From what you are saying I could basically work up my loads while fire forming the cases at the same time. I was planning on fire forming cases and then just truing the necks up. According to my calculations there should be .002 to .003 left in the neck. Neil J made my dies also and he wanted me to try the TN approach. I have used this approach with 6PPC's and 22PPC's in the past. No problem if I do not like it I will turn necks and use the .334 NK bushing. I might also experiment with some trail boss or pistol powder in fire forming with no bullet and use the case shoulder to set the cartridge head space. I use to have a 284 Jamison which 404 Jeffrey cases. Biggest mistake I ever made in a cartridge. It was a beast in its time and was accurate. But making the cases was a nightmare. I really got a education on case preparation. Nothing but chamber pressure issues. The rifle has been rechambered to a 7 WSM and works flawlessly and just as accurate.
I have a Stiller TAC 338 action for this build that uses the same mag box you have which is center feed. I have never had any problems with center feed boxes. I have them on all my rifles because they are the best in my opinion.
I also use the Boretech (best) and use patches only. I never shoot over 4 or 5 shots without cleaning. The way I break my barrels in it usually takes 20-25 shots, cleaning after every shot. I agree barrel heat and cleaning is the key to the life of the barrel.
The load you mentioned, 103 G of Retumbo, is that your best load and what you are using now? You also mentioned some hotter loads which I would not start out with, but how was the accuracy for the higher velocity rounds. I will probably start around 100 G and work up.
I'm not familiar with the "TN" approach, forgive my ignorance.
I did use the Cream of Wheat and Pistol powder on another rifle, but could never get out of my mind, the thought of "muffin" debris in my pristine uber precise custom barrel.....my time is precious, probably like many shooters, so I've come to developing a load with my first batch of virgin brass cases, and enjoying/learning the rifle by shooting during fireforming.
103 grains is what I use now with the 210 Berger. I'm ashamed to admit it...but the Lapua case has allowed 108 grains of Retumbo under a 210 VLKD to be fired with no classic visible/tactile signs of pressure. I won't post the velocity. Again I post that, out of shock/shame, and the hope it saves someone from doing something dumb. Some smart folks on this board, pointed me to completing a "pressure ladder" using Norma brass loaded (still consistent, but just softer/not as tough as Lapua) in one grain increments until pressure signs were evident. This would enable me to get in the ballpark for final load development with the Lapua brass, as it is so tough...it might be easy to get into pressure trouble, and not even know it, especially with a very concentric chamber.
H1000 and the 200 NAB work well together in this round so far as well.
I just got a box of the Hornday 225 grainers with what looks to be a .351 G7 BC...anxious to see how they shoot. I'd like to try the new Viht N570 with that bullet in this chamber, but I haven't cracked the code on obtaining "botique" powders like that here yet. Yet.
So you've got a bunch of great bullets for LRH to pick from..200 NAB, 208 AMAX, 210 VLD, 225 Hornday (not sure that's a proven hunting bullet yet)...