Well, that was my goal. I think I first started seeing tuners in about 2016. I spent 2 years shooting UBR (short range benchrest) with a 6ppc. I learned a lot from those guys. My gun did not have a tuner but I've been intrigued by them since.
] Just understand that the barrel is then dedicated to monos and will likely not probably work well with lead core bullets. Bullet disintegration and poor accuracy with lead core projectiles are likely, but try it anyway, just don’t be shocked when you see these problems. Mono projectiles are made in a lathe and are extremely concentric and symmetrical, no weird hollows or inclusions, with super sharp tips, and they are very strong, far more so than lead core bullets, so they are often accurate and do well with very fast twist rates. Of course, playing with monos and special purpose dedicated 30” custom barrels is a rather expensive hobby.
why did you start at 41.5 grains of h4350??? have you not worked up in loads?
thank you. helpful. i didn't know new barrels speed up over time. as to your added last statement, i agree. i ran my 308 at 2760 for a year+, added a tuner, tweaked depth, etc....i was shooting single digit SDs, but 1 MOA typical was the best i ever got (yes it shot less from time to time, but not consistently). then one day, was looking at old data and saw slower node. tried it on a whim. bam, .5MOA. so now, i run 2650 and it shoots lights out. learned that lesson...only took a year and a 1/2...
its already shooting <.5MOA with my first load attempts, so no complaints.
I also have a MPA BA rifle, and it is remarkably accurate with 140 gn factory Hornady and Berger ammo.
thanks again for your help here and in the messages. i reached out to MPA and they responded quickly. they confirmed the 140 gn focus, but did not specify a brand (i did ask). they also said you can use 147. no further details. i rechecked my lapua and it measured 14.5 to 15 thou. the majority of 1fired brass has opened up enough that the bullet slides in fairly easy...not quite "free", but with a light to medium push, it seated....enough that i will need to resize prior to using, so again, i think everything is operating as expected and I just need to turn it down a little regarding charge weight. oh, they also said don't worry about speed as it will pick up.
thanks again!Glad it got sorted out. I have found the folks at MPA to be super responsive.thanks again for your help here and in the messages. i reached out to MPA and they responded quickly. they confirmed the 140 gn focus, but did not specify a brand (i did ask). they also said you can use 147. no further details. i rechecked my lapua and it measured 14.5 to 15 thou. the majority of 1fired brass has opened up enough that the bullet slides in fairly easy...not quite "free", but with a light to medium push, it seated....enough that i will need to resize prior to using, so again, i think everything is operating as expected and I just need to turn it down a little regarding charge weight. oh, they also said don't worry about speed as it will pick up.
had pressure signs today with 41.1 grains of h4350 got 2 cases stuck after firing. so nope on that one. will back it down now to40.8 grains i know there was no pressure signs there.
using 140bthp, loaded 40.8 to 41.1 i am almost the same speed. so no pressure with the40.8
I'm running a 26" Left-twist Chanlynn barrel.
As far as powder goes I have well over 3k probably closing in on 4k rounds with StaBall in various 6.5CMs. Fantastic performance shoot it to a mile every week I don't trickle any charges. I drop within .02g every time I do maybe 5 test drops b/f I start more to get my tempo down on my powder measuring, but double check on a beam scale and digital. Love it won't be going back to 4350.
). I am preparing for a PRS match with the 308, but bring the 6.5 with me to the range to fire form and test loads once finished training. Yesterday, I found H4350 w/ 140 ELDS loaded at 39.4, 39.6 and 39.8 to have shot a .25MOA group at 300 yds. I was simply amazed. this brings me to my question: how do you decide between speed and accuracy? Is .25 MOA @2650 better than .5MOA at 2750 with the 6.5? with my 308 using 175g, I went from 2750, but 1 MOA with occassional flyers to 2650 and .5 MOA. That was pretty obvious to me. But the 6.5 being flatter, more impervious to wind, it seems like it gets a little greyer. 
Yep, makes sense .01mil/mph dif at 1000, so definitely not much difference. 26" more drop, but since shooting mostly known distances, that should matter too much either.
i'm not following you. are you saying your factory rounds have been zeroed and that your reloads are 2" to 3" high using that same zero? that would not be unusual at all, but just making sure that is your point.
Yes, that's what I'm experiencing. I was told that my bullet might need to be seated deeper, but I am looking for opinions before I tweek anything.
well, the seating might be an issue, but when you reloaded, you basically created a completely different solution from the factory ammo. therefore, the point of impact could easily be expected to be different. based upon powder type and amount, i can very easily create two rounds that don't hit anywhere near each other. if your goal is to try and "replicate" the factory ammo, then you'll need to determine its velocity and then see if the powder you have can produce those velocities while not exceeding pressure. once that is determined, then moving seating depth may change point of impact and change the repeatibility of the bullet. i guess the real question is why are you trying to replicate the factory ammo instead of developing a hand load that meets whatever goal you have.
I didn't realize I'd have to re-zero each time I changed ammo. I know it's good to do each time I set up incase the scope got knocked out of walk.
Your 40gr Staball load is a starting load. It shoots higher because it’s going slower. IMHO around 2.810 works well as a start point with the Hornady 140 HPBT. I see you posted you are somewhat new to reloading. If you were going to try to lower the POI by bullet seating IMHO you are changing the wrong variable. Sure it will increase pressure and therefore velocity but there are better ways. Standard practice is to increase powder charge to increase velocity, change bullet depth to fine tune the precision. If you haven’t run a pressure check with your rifle be careful, you can’t just dump more powder in
yes, even if you use the same bullet and powder, but change just the case, for example, or even if you use all the same components, but sight in with virgin brass, you will find that once fired brass probably will have a different POI. as to your question on changing seating depth, again, it will depend on your powder type/charge as to when too little is too much. sorry to be "ambiguous", but you are building a system and all the variables have impact on the outcome, so its hard to tell you what one variable is without having developed all the other variables. if you are happy with the repeatibility of the round you have reloaded, i would zero and move forward with it. if you want to move the seating depth, you should probably look at doing sets of 3 rounds at varying depths. maybe try moving in increments of .003" and see how that impacts your repeatibility and see if pressure signs develop. varying the depth can make a round display pressure signs where it was just fine before.
i should add, i have three different powder loads/bullet combinations in my 308 that have the same zero at 100 yds, so just because they are different doesn't mean it MUST have a different zero. it is just highly likely.
Wow. Thanks for all the info. I'm starting to understand it a little better now.
good luck to you. not knowing how much you have reloaded, i would encourage you to do some research/classes. I was fortunate that i have a range with an owner who has precision reloading classes among other things. it was realy helpful. so, while experience helps, you can jump years of experience just by doing some classes, reading, youtube, etc. lots of good reloading books out there and this site has plenty of good info too. go slow, be careful. here is a link that you may have already seen, but has some good info: https://www.snipershide.com/shooting/threads/reloading-101-reloading-basics-for-the-new-reload.100/
Thanks for the link.
