What is the issue with Accubond long range bullets?

[FLHunter87]

An update for me. Last few times I have shot these accuracy seems its becoming a bigger group. And Im talking about an 1-1.5" group at 100 yards compared to less than a half inch I normally get. I am not sure why that is. Nothing has changed. If this continues I may switch or maybe need to try a different seating depth. Maybe 300 shots or so on barrell.

 

[FLHunter87]

I stuggled getting a load together on the 210's for 2 different 300 PRC's and gave up. I tried 265 ABLR's on my 338 RUM and gave up again they just were not accurate enough for me. I have heard good things about the 142's though. I shoot 140 Elite Hunters on my 6.5 PRC and they shoot lights out so I do not plan to change.

What powder do you use for the 140s EH? I just made some with h1000 to try out. If these dont work I'm just going to go with the 156 since I have the 1:7 twist.

 

[IDShane]

56.5 grain H1000 it is the most accurate rifle that I own.

 

[FLHunter87]

56.5 grain H1000 it is the most accurate rifle that I own.

I use 56.8 at 2.357" CBTO. That's what I've used my last 100 shots or so. Now its just opened up a lot.

 

[NorthIdahoDude]

An update for me. Last few times I have shot these accuracy seems its becoming a bigger group. And Im talking about an 1-1.5" group at 100 yards compared to less than a half inch I normally get. I am not sure why that is. Nothing has changed. If this continues I may switch or maybe need to try a different seating depth. Maybe 300 shots or so on barrell.

With high pressure and a small diameter bore, the 6.5 PRC doesn't have the longest barrel life as cartridges go, and ABLRs (I am told) are somewhat sensitive to seating depth. 300 rounds in, I would not be the least bit shocked if your throat has moved forward a little bit. Remeasure your distance to the lands and see if it's longer than it was when you first developed the load - solution might be as simple as increasing your OAL some.

 

[IDShane]

With high pressure and a small diameter bore, the 6.5 PRC doesn't have the longest barrel life as cartridges go, and ABLRs (I am told) are somewhat sensitive to seating depth. 300 rounds in, I would not be the least bit shocked if your throat has moved forward a little bit. Remeasure your distance to the lands and see if it's longer than it was when you first developed the load - solution might be as simple as increasing your OAL some.

That's good advice....

 

[Harvey_NW]

With high pressure and a small diameter bore, the 6.5 PRC doesn't have the longest barrel life as cartridges go, and ABLRs (I am told) are somewhat sensitive to seating depth. 300 rounds in, I would not be the least bit shocked if your throat has moved forward a little bit. Remeasure your distance to the lands and see if it's longer than it was when you first developed the load - solution might be as simple as increasing your OAL some.

Shoot sufficient sample sizes and you'll realize changes in seating depth don't do as much as people like to think. I'd love to see test results that proved it does, but I have a thread that went like 8+ pages asking for proof that seating depth made a difference and there's 1 set of results from a wildcat .17 cal that fall outside the expected statistical variability.

 

[EdP]

I'm in the camp of those that can't get secant ogive bullets to shoot well so I stick to tangent ogives. Sierra GKs and Nosler ABs work well for me both on targets and on game so that's what I stick with.

 

[NorthIdahoDude]

Shoot sufficient sample sizes and you'll realize changes in seating depth don't do as much as people like to think. I'd love to see test results that proved it does, but I have a thread that went like 8+ pages asking for proof that seating depth made a difference and there's 1 set of results from a wildcat .17 cal that fall outside the expected statistical variability.

I do shoot sufficient sample sizes (5 round initial test, 10 rounds if initial test was good, and 30 once I've got something I think is good to go - and then 3 at a time to check zero now and then after the 30 round test, unless/until something causes me to doubt the zero and/or accuracy, at which point I'll bump group size back up).

My experience is, that some guns seating depth does matter (sometimes a LOT), and for some guns it doesn't. I don't really know why, other than I suspect it has to do with throat geometry and/or possibly if the chamber-to-bore alignment is not dead-nuts perfect, or maybe a bit of both.

For example, my Shilen 7x57 barrel, on both the Savage it started life on, and the Tikka it now lives on, shoots consistently with the bullets seated in the ballpark of .030 to .060 off the lands. Experiments with both longer and shorter OAL's, and it starts to produce occasional fliers about 1/2 to 3/4 MOA out of the main group; and it seems to do this across all bullets I've tried (I'm about 900 rounds into it at this point, so I have a pretty broad spectrum of different things I've experimented with it).

On the other side of the coin, most of the Tikkas I've ever owned didn't seem to care (although, I would say in fairness, all of them had throats so long that seating close to the lands was near impossible, LOL, my old 308 literally had a .250+ (yes, 1/4 inch) jump for most bullets seated at mag length, and there was no bullet I ever found that could be seated within .060 or so and still have sufficient shank in the case neck).

Anyway, my $0.02, worth what you paid for it.