Re: 30 Gibbs shoots
JerryM, I too was a little skeptical about the results. Well, not anymore. My barrel is 26 1/2", 1 in13twist. My load uses H4350 and moly 165gr SST lit with a Fed 215M primer. Loaded to just off the lands, the accuracy has been really good (1/3MOA at 250yds). Vel is 3000fps. I can get to 3100fps but groups open up and brass life is VERY short - max load would be about right.
Using H4831SC, the vel is slightly under 2900fps and the accuracy is even better.
I am sticking to the H4350 because the extra vel is what I am after and the accuracy is small enough for the intended use. Will try shooting at LR when the snow melts a little.
Goal is reliable shooting from field rests under 3/4 MOA at 950 yds.
Thanks for the offer Darryl but I am going to stick to the H4350 simply because it is working in this and other rifles. I don't want to stock too many other powders.
As to the fears of a short neck, try this experiment. With your boattail bullets seated in the case, put another beside and see how much of the bullet is actually held by the neck. I bet it is a lot less then you think.
When I did this with my SST and my '06, I found that only 1/4" of the bullet was held. The boattail occupied most of the neck/shoulder. My Gibbs holds as much of the bullet as the longer necked '06. It also allows loads that are very close to the RSAUM.
Magazine capacity is higher then the short magnums, brass is everywhere and "free", performance is very similar. Would recommend the Gibbs family to anyone looking for more performance out of the '06 family of cartridges.