While this doesn't quite answer the question, My .30-06 AI will do approximately 100 ft/sec faster than a regular '06. It really isn't worth the trouble, and the best way to prove this to yourself is to run some realistic ballistic tables to the above mentioned yardages. If you want considerably more speed use a bigger cartridge, the 28" tube should be able to help out some of the slower powders when paired with a heavier projectile. I'd imagine that with enough R22 or similiar with the 175 or 180's that close on 2900 ft/sec's should be yours for the taking. Years back I chronographed some factory 180 grain .300 Winchester ammo which was in the low 2900 ftsec range. This was from 24" barrels. AI's and Gibbs while interesting and good conversation pieces are much trouble for little real gain, IMHO [img]images/icons/smile.gif[/img]
I have a friend who shoots the 30 Gibbs and uses WMR and gets vel near 300 win mag.
It is just a matter of personal preference
how much is enough or what do you want to go through to get to a certain end.I like the wildcat cartridges Gibbs,Ackley and the others but some may not, to each his own!
Well I was thinking that with the extra few inches of barrel and the tight bore that I maye be able to get into the 300Win velocities pretty easy , I've got a 30-06Ai with a 26" Lilja tube that will run the 180gr Partitions out at just over 3000fps easly.
I guess I'll see what it will do as a standard 30-06 first
Hell who knows maybe i'll give the 300 Dakota another try.
I have run a 30Gibbs and it is one of my favorite wildcats. There is an increase in performance and that is sig when ranges get out there.
I have a slow '06 at 2750fps for 165gr bullets. My Gibbs took the same bullet to 2950fps accurately. Could go faster but then I had a shotgun. My guess is that your 28" tube would be around 3050fps with the 165gr bullet, and close to 2950fps with the 180gr. Very close to the 30 WSM and 300WM.
With the lower BC of these bullets, I liked the idea of reducing wind drift and increasing impact vel/energy. Small but a definite difference. You gain another 100yd in performance.
Same reason why people use the 300WM. There really is only a small increase in vel over the '06 but that has not detered the thousands who use it.
I have sold my gibbs and replaced it with a 6.5-06. The reason, wind drift at ranges beyond 500yds. As good as the 165gr SST is, the 140gr SST is head and shoulders above it.
At basically the same muzzle vel, the 6.5 is hitting harder at all ranges because of higher retained vel. The reduced wind drift is amazing.
Comparing the gibbs and '06, I would go Gibbs. Between the 30Gibbs and the 6.5-06, 6.5 all the way. I would have built a 6.5Gibbs but my action will not feed the sharp shoulders.
A 7mm Gibbs/280AI/7JRS would also be on my possibles list. Something to think about if you haven't bought the barrel yet...
Well I already have the barrel or at least have paid for it. I guess that I'll shoot it as a standard 30-06 and see what it will do.
The ranges it will be used are well under the 100oyd mark probably 700 at the most , generaly between 400 and 600 yds.
Jerry , would you happen to know what the BC of the 165gr and 180gr SST bullets are ? How do they stack up akainst the A-max ?