Flat Based Bullets

[GeoDudeFlorida]

So 42 ish in 308 and make it count.....

I heard from a little birdie that bullet’s favorite powder in .308 is TAC. And, yes, around 42-ish grains.

 

[nettlle]

44ish 4064 with 168gr Sierra HPBT Matchking's is not so bad for 308.

 

[AJC1]

I heard from a little birdie that bullet’s favorite powder in .308 is TAC. And, yes, around 42-ish grains.

I got varget, 4064, tac, 4895, or any go juice you prefer. Thse student stands ready.

 

[AJC1]

44ish 4064 with 168gr Sierra HPBT Matchking's is not so bad for 308.

These are 180s not so common.

 

[GeoDudeFlorida]

I got varget, 4064, tac, 4895, or any go juice you prefer. Thse student stands ready.

Actually I was hoping to learn a thing or two.
I suggest starting at 40gr of TAC and keep going up in 1/2gr increments until you hit The Load or the pressure wall. If you run out of bullets let me know.

 

[Chief TC]

Thanks for all the extensive information

This is kinda like saying “vehicles with big engines can drive faster,” then going out and buying a Peterbilt semi-tractor instead of a Corvette.

Short range benchrest has traditionally been dominated by flat base bullets because they offer long bearing surface, clean gas seal, high stability to initial pressure front, and great balance between center of gravity relative to center of pressure. But short range benchrest isn’t dominated by Hornady soft points and M1917’s.

Personally, I would have revisited why the rifle grouped “well,” (relatively speaking, I guess, in this instance) at 100yrds but did not group well at 200. That’s a huge red flag for me.

Since I have been trying to find "the load" for my M1917 and M1903A3, most of the loads I've developed were 2 MOA or less at 100 but then when going to 200+, most these loads performed poorly. 180 BTs that are .015 from the lands in the M1917 is the ticket with sub 2 MOA at 200. Still working on the M1903A3 load but looks like with a couple adjustments, I will get the 168 HPBTs working well. As GeoDude mentioned, I needed to treat the FB development separately which I will do and maybe I can find a combo that shoots well. I look forward to trying SMKs and other Sierra bullets but they sure are proud of their stuff these days.

Thanks again everyone. Really great feedback. And Slamfire! Many thanks for the detailed response and your experiences. Need to read a few more times to soak it all in.

 

[.45Coltguy]

After reading thru this a bit more and seeing an interest .308 Win, I had to go thru some older notes and found this: What I shot in a Rem 700 PSR with a 26" or 28" heavy barrel, a Leupold Vari-X 6-14 scope[I think!] : 168gr SMK, Win cases, Win LRP and 41.0-41.5gr IMR 4895, OAL 2.775". This was a very accurate load for me. This was years ago. Haven't been in that game since the early 90's, but, that load sure worked for me.

 

[AJC1]

Actually I was hoping to learn a thing or two.
I suggest starting at 40gr of TAC and keep going up in 1/2gr increments until you hit The Load or the pressure wall. If you run out of bullets let me know.

Well the bench was sold and my press is sitting in a crate looking sad at me every time I walk by. When I get to the new house I'll do a workup and post or send you my findings.

 

[GeoDudeFlorida]

Well the bench was sold and my press is sitting in a crate looking sad at me every time I walk by. When I get to the new house I'll do a workup and post or send you my findings.

Cool! Thanks!
No longer have young eyes or hands.